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Observed 5:55 AM MDT at KLMO

Altona, CO weather

Clear and 47°8°, 10°6° colder than a typical Oct 24.

Today: low 37°3° (likely 37°3° to 43°6°), high 52°11° (likely 51°11° to 58°14°).

Forecasts differ

Now 47°8°

Clear

Wind
Calm
Up to 8 mph13 km/h through 6 PM
Dew point
33°1°
Dry, static shocks likely
UV index
0Low
Moderate 11 AM–4 PM · peak 4
Air today
45Good
EPA forecast · Ozone
Pressure (notable)
30.22 inHg1023 hPa
Rising fast · +0.13 inHg+4.5 hPa in 3 h

Next 2 hours

No precipitation expected in the next 2 hours.

Next 48 hours

2°1° cooler than this time yesterday (50°10° then, 47°8° now)

Good hours for
  • Dry until 3 PM
  • Rain today 3–9 PM (40%, 0.09 in2.3 mm)
  • Fog tonight 2–3 AM
  • Fog tomorrow 4 AM–noon
  • Rain tomorrow night from 6 PM (70%, 0.42 in11 mm)
  1. This morningNear 49°9° · Partly cloudy
  2. This afternoonNear 49°9° · Rain 3–6 PM (30%)
  3. TonightDown to 38°3° by 5 AM · Rain 6–9 PM (40%)
  4. Tomorrow morningUp to 45°7° by 11 AM · Mostly cloudy
  5. Tomorrow afternoonUp to 51°11° by 4 PM · rain chance 20% · Mostly cloudy
  6. Tomorrow nightDown to 42°6° by 4 AM · Rain all night (70%)
Hourly forecast, next 48 hours, in the place's local time
HourConditionsTemperatureFeels likePrecipitationWindHumidityCloud coverUV index
Sat 6aClear49°9° (likely 45°7° to 49°9°)48°9°10%3 mph5 km/h from SE, gusts 7 mph12 km/h54%23%0
Sat 7aMostly sunny47°8° (likely 45°7° to 47°8°)45°7°10%5 mph8 km/h from ESE, gusts 6 mph10 km/h58%39%0
Sat 8aMostly cloudy47°8° (likely 45°7° to 48°9°)44°7°10%6 mph10 km/h from E, gusts 7 mph12 km/h60%58%0
Sat 9aMostly sunny48°9° (likely 46°8° to 50°10°)44°7°10%8 mph13 km/h from ENE, gusts 6 mph10 km/h60%49%1
Sat 10aSunny49°9° (likely 46°8° to 51°11°)46°8°10%8 mph13 km/h from ENE, gusts 9 mph15 km/h61%32%2
Sat 11aCloudy49°9° (likely 46°8° to 52°11°)46°8°10%7 mph11 km/h from ENE, gusts 10 mph16 km/h61%66%3
Sat 12pCloudy49°9° (likely 47°8° to 52°11°)46°8°20%, 0.01 in0.3 mm7 mph11 km/h from ENE, gusts 10 mph17 km/h63%84%4
Sat 1pCloudy51°11° (likely 48°9° to 52°11°)51°11°20%, 0.01 in0.3 mm7 mph11 km/h from ENE, gusts 9 mph15 km/h56%86%4
Sat 2pCloudy50°10° (likely 49°9° to 52°11°)48°9°20%, 0.01 in0.3 mm6 mph10 km/h from ENE, gusts 9 mph15 km/h56%84%4
Sat 3pCloudy50°10° (likely 48°9° to 52°11°)48°9°30%, 0.01 in0.3 mm6 mph10 km/h from ENE, gusts 10 mph16 km/h56%92%4
Sat 4pCloudy50°10° (likely 47°8° to 51°11°)48°9°30%, 0.01 in0.3 mm6 mph10 km/h from ENE, gusts 8 mph13 km/h56%95%2
Sat 5pShowers48°9° (likely 43°6° to 50°10°)45°7°30%, 0.01 in0.3 mm6 mph10 km/h from E, gusts 8 mph12 km/h63%94%1
Sat 6pDrizzle45°7° (likely 41°5° to 48°9°)43°6°40%, 0.02 in0.5 mm5 mph8 km/h from E, gusts 5 mph8 km/h68%100%0
Sat 7pCloudy43°6° (likely 40°4° to 47°8°)41°5°40%, 0.02 in0.5 mm3 mph5 km/h from ESE, gusts 5 mph7 km/h73%96%0
Sat 8pCloudy43°6° (likely 40°4° to 46°8°)43°6°40%, 0.02 in0.5 mm2 mph3 km/h from ESE, gusts 4 mph6 km/h73%89%0
Sat 9pCloudy43°6° (likely 39°4° to 45°7°)43°6°20%, 0.02 in0.5 mm2 mph3 km/h from SSE, gusts 4 mph7 km/h76%89%0
Sat 10pCloudy43°6° (likely 39°4° to 44°7°)43°6°20%, 0.02 in0.5 mm2 mph3 km/h from SSE, gusts 5 mph7 km/h76%89%0
Sat 11pShowers43°6° (likely 38°3° to 43°6°)43°6°20%, 0.02 in0.5 mm2 mph3 km/h from SSE, gusts 5 mph8 km/h76%93%0
Sun 12aCloudy42°6° (likely 38°3° to 42°6°)42°6°10%2 mph3 km/h from SSE, gusts 5 mph8 km/h82%95%0
Sun 1aCloudy40°4° (likely 38°3° to 41°5°)40°4°10%2 mph3 km/h from SSE, gusts 5 mph8 km/h85%95%0
Sun 2aFog41°5° (likely 37°3° to 41°5°)41°5°10%2 mph3 km/h from SE, gusts 5 mph8 km/h86%93%0
Sun 3aCloudy40°4° (likely 37°3° to 40°4°)40°4°5%1 mph2 km/h from SE, gusts 5 mph9 km/h89%91%0
Sun 4aFog39°4° (likely 37°3° to 40°4°)39°4°5%1 mph2 km/h from SE, gusts 4 mph7 km/h92%87%0
Sun 5aFog38°3° (likely 37°3° to 39°4°)38°3°5%2 mph3 km/h from SE, gusts 5 mph8 km/h96%84%0
Sun 6aFog37°3° (likely 36°2° to 39°4°)37°3°0%2 mph3 km/h from SE, gusts 5 mph7 km/h100%80%0
Sun 7aFog37°3° (likely 37°3° to 39°4°)37°3°0%2 mph3 km/h from ESE, gusts 5 mph7 km/h100%78%0
Sun 8aFog37°3° (likely 37°3° to 39°4°)37°3°0%2 mph3 km/h from ESE, gusts 4 mph6 km/h100%79%0
Sun 9aFog39°4° (likely 38°3° to 40°4°)39°4°5%2 mph3 km/h from NE, gusts 4 mph6 km/h100%77%1
Sun 10aFog42°6° (likely 39°4° to 42°6°)42°6°5%2 mph3 km/h from ENE, gusts 6 mph9 km/h96%79%2
Sun 11aFog45°7° (likely 40°4° to 45°7°)44°7°5%3 mph5 km/h from ENE, gusts 6 mph10 km/h89%81%3
Sun 12pCloudy47°8° (likely 42°6° to 47°8°)46°8°20%, 0.01 in0.3 mm3 mph5 km/h from E, gusts 6 mph9 km/h83%81%4
Sun 1pShowers49°9° (likely 44°7° to 50°10°)48°9°20%, 0.01 in0.3 mm3 mph5 km/h from ENE, gusts 7 mph11 km/h77%75%5
Sun 2pPartly sunny49°9° (likely 47°8° to 51°11°)48°9°20%, 0.01 in0.3 mm3 mph5 km/h from ENE, gusts 9 mph14 km/h74%39%5
Sun 3pShowers50°10° (likely 49°9° to 52°11°)49°9°20%, 0.01 in0.3 mm3 mph5 km/h from ENE, gusts 7 mph12 km/h71%59%4
Sun 4pCloudy51°11° (likely 49°9° to 52°11°)51°11°20%, 0.01 in0.3 mm3 mph5 km/h from NE, gusts 7 mph12 km/h68%66%3
Sun 5pCloudy49°9° (likely 48°9° to 51°11°)47°8°20%, 0.01 in0.3 mm5 mph8 km/h from NE, gusts 9 mph14 km/h74%78%1
Sun 6pDrizzle47°8° (likely 46°8° to 48°9°)45°7°70%, 0.04 in1 mm5 mph8 km/h from NNE, gusts 10 mph16 km/h79%97%0
Sun 7pShowers45°7° (likely 44°7° to 46°8°)44°7°70%, 0.04 in1 mm3 mph5 km/h from NNE, gusts 11 mph17 km/h86%99%0
Sun 8pShowers44°7° (likely 43°6° to 46°8°)44°7°70%, 0.04 in1 mm2 mph3 km/h from NNE, gusts 10 mph17 km/h86%99%0
Sun 9pShowers44°7° (likely 43°6° to 45°7°)44°7°70%, 0.04 in1 mm2 mph3 km/h from N, gusts 11 mph17 km/h89%99%0
Sun 10pDrizzle44°7° (likely 42°6° to 45°7°)44°7°70%, 0.04 in1 mm2 mph3 km/h from N, gusts 9 mph15 km/h89%99%0
Sun 11pShowers44°7° (likely 42°6° to 45°7°)44°7°70%, 0.04 in1 mm2 mph3 km/h from N, gusts 8 mph12 km/h89%99%0
Mon 12aShowers44°7° (likely 42°6° to 45°7°)44°7°70%, 0.03 in0.8 mm0 mph0 km/h, gusts 6 mph10 km/h89%99%0
Mon 1aShowers44°7° (likely 41°5° to 47°8°)44°7°70%, 0.03 in0.8 mm0 mph0 km/h, gusts 3 mph5 km/h89%99%0
Mon 2aShowers44°7° (likely 41°5° to 45°7°)44°7°70%, 0.03 in0.8 mm0 mph0 km/h, gusts 3 mph4 km/h86%75%0
Mon 3aShowers43°6° (likely 39°4° to 44°7°)43°6°70%, 0.03 in0.8 mm0 mph0 km/h, gusts 5 mph7 km/h89%97%0
Mon 4aShowers42°6° (likely 40°4° to 44°7°)42°6°70%, 0.03 in0.8 mm0 mph0 km/h, gusts 5 mph8 km/h93%99%0
Mon 5aShowers42°6° (likely 40°4° to 44°7°)42°6°70%, 0.03 in0.8 mm0 mph0 km/h, gusts 3 mph5 km/h89%95%0

Days ahead

Shaded: typical range for these dates (1991–2020)
  1. Today, Oct 24. Drizzle. High 52°11°, low 37°3°. Typical 62°17° / 30°−1°. Rain 0.04 in1 mm, 30% chance. Forecasts differ.
    1. Morning

      6 AM–noon

      Mostly sunny, 47°8°

      Dry

    2. Afternoon

      noon–6 PM

      Showers, 51°11°

      30% chance · 0.06 in1.5 mm

    3. Evening

      6 PM–midnight

      Cloudy, 43°6°

      40% chance · 0.12 in3 mm

    4. Overnight

      midnight–6 AM

      Cloudy, 38°3°

      Dry

    Official NWS forecast

    Today: A chance of rain showers after noon. Mostly cloudy. High near 52, with temperatures falling to around 48 in the afternoon. East wind 3 to 8 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

    Tonight: A chance of rain showers before midnight. Cloudy, with a low around 37. Southeast wind 1 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.

    Forecasts differIndependent forecasts disagree; expect changes and plan for the range.

    High, likely
    51°11°–58°14°
    Low, likely
    37°3°–43°6°
    Typical high / low
    62°17° / 30°−1°
    Wind
    12 mph19 km/h, gusts 18 mph29 km/h
    UV peak
    4
  2. Tomorrow, Oct 25. Drizzle. High 51°11°, low 41°5°. Typical 62°17° / 30°−1°. Rain 0.11 in2.8 mm, 20% chance. Mostly agree.
    1. Morning

      6 AM–noon

      Fog, 37°3°

      Dry

    2. Afternoon

      noon–6 PM

      Showers, 51°11°

      20% chance · 0.06 in1.5 mm

    3. Evening

      6 PM–midnight

      Showers, 44°7°

      70% chance · 0.24 in6.1 mm

    4. Overnight

      midnight–6 AM

      Showers, 42°6°

      70% chance · 0.18 in4.6 mm

    Official NWS forecast

    Day: A slight chance of rain showers after noon. Partly sunny. High near 51, with temperatures falling to around 49 in the afternoon. East northeast wind around 5 mph. Chance of precipitation is 20%.

    Night: Rain showers likely. Cloudy, with a low around 41. North northeast wind 0 to 5 mph. Chance of precipitation is 70%.

    Mostly agreeIndependent forecasts are fairly close; small surprises are possible.

    High, likely
    49°9°–53°12°
    Low, likely
    36°2°–41°5°
    Typical high / low
    62°17° / 30°−1°
    Wind
    9 mph15 km/h, gusts 17 mph27 km/h
    UV peak
    5
  3. Monday, Oct 26. Drizzle. High 57°14°, low 37°3°. Typical 62°17° / 30°−1°. Rain 0.09 in2.3 mm, 30% chance. Mostly agree.
    1. Morning

      6 AM–noon

      Drizzle, 42°5°

      50% chance · 0.03 in0.7 mm

    2. Afternoon

      noon–6 PM

      Sunny, 54°12°

      Dry

    3. Evening

      6 PM–midnight

      Clear, 45°7°

      Dry

    4. Overnight

      midnight–6 AM

      Clear, 36°2°

      Dry

    Hours this far out come from computer models only.

    Official NWS forecast

    Day: A chance of rain showers before noon. Partly sunny, with a high near 57. East northeast wind 0 to 3 mph. Chance of precipitation is 30%.

    Night: Mostly clear, with a low around 37.

    Mostly agreeIndependent forecasts are fairly close; small surprises are possible.

    High, likely
    51°11°–57°14°
    Low, likely
    36°2°–42°6°
    Typical high / low
    62°17° / 30°−1°
    Wind
    11 mph17 km/h, gusts 18 mph28 km/h
    UV peak
    5
  4. Tuesday, Oct 27. Mostly sunny. High 64°18°, low 39°4°. Typical 61°16° / 29°−2°. Dry. Mostly agree.
    1. Morning

      6 AM–noon

      Mostly sunny, 39°4°

      Dry

    2. Afternoon

      noon–6 PM

      Sunny, 63°17°

      Dry

    3. Evening

      6 PM–midnight

      Clear, 49°9°

      Dry

    4. Overnight

      midnight–6 AM

      Clear, 39°4°

      Dry

    Hours this far out come from computer models only.

    Official NWS forecast

    Day: Sunny, with a high near 64.

    Night: Mostly clear, with a low around 39.

    Mostly agreeIndependent forecasts are fairly close; small surprises are possible.

    High, likely
    61°16°–66°19°
    Low, likely
    32°0°–39°4°
    Typical high / low
    61°16° / 29°−2°
    Wind
    15 mph24 km/h, gusts 32 mph52 km/h
    UV peak
    5
  5. Wednesday, Oct 28. Mostly sunny. High 63°17°, low 40°4°. Typical 61°16° / 29°−2°. Dry. Forecasts agree.
    1. Morning

      6 AM–noon

      Sunny, 42°6°

      Dry

    2. Afternoon

      noon–6 PM

      Sunny, 59°15°

      Dry

    3. Evening

      6 PM–midnight

      Cloudy, 47°8°

      Dry

    4. Overnight

      midnight–6 AM

      Cloudy, 40°5°

      Dry

    Hours this far out come from computer models only.

    Official NWS forecast

    Day: Sunny, with a high near 63.

    Night: Partly cloudy, with a low around 40.

    Forecasts agreeIndependent forecasts are close; the range is narrow.

    High, likely
    58°14°–63°17°
    Low, likely
    34°1°–42°6°
    Typical high / low
    61°16° / 29°−2°
    Wind
    8 mph12 km/h, gusts 32 mph51 km/h
    UV peak
    5
  6. Thursday, Oct 29. Partly sunny. High 64°18°, low 43°6°. Typical 60°16° / 29°−2°. Dry. Mostly agree.
    1. Morning

      6 AM–noon

      Cloudy, 44°7°

      Dry

    2. Afternoon

      noon–6 PM

      Partly sunny, 61°16°

      Dry

    3. Evening

      6 PM–midnight

      Partly cloudy, 49°10°

      Dry

    4. Overnight

      midnight–6 AM

      Cloudy, 44°7°

      Dry

    Hours this far out come from computer models only.

    Official NWS forecast

    Day: Mostly sunny, with a high near 64.

    Night: Partly cloudy, with a low around 43.

    Mostly agreeIndependent forecasts are fairly close; small surprises are possible.

    High, likely
    60°16°–64°18°
    Low, likely
    35°2°–44°7°
    Typical high / low
    60°16° / 29°−2°
    Wind
    9 mph15 km/h, gusts 15 mph25 km/h
    UV peak
    4
  7. Friday, Oct 30. Cloudy. High 64°18°, low 43°6°. Typical 60°16° / 28°−2°. Dry. Forecasts differ.
    1. Morning

      6 AM–noon

      Cloudy, 49°9°

      Dry

    2. Afternoon

      noon–6 PM

      Cloudy, 62°17°

      Dry

    3. Evening

      6 PM–midnight

      Cloudy, 52°11°

      Dry

    4. Overnight

      midnight–6 AM

      Partly cloudy, 44°7°

      Dry

    Hours this far out come from computer models only.

    Official NWS forecast

    Day: Partly sunny, with a high near 64.

    Night: Mostly cloudy, with a low around 43.

    Forecasts differIndependent forecasts disagree; expect changes and plan for the range.

    High, likely
    59°15°–65°18°
    Low, likely
    38°3°–46°8°
    Typical high / low
    60°16° / 28°−2°
    Wind
    7 mph12 km/h, gusts 17 mph27 km/h
    UV peak
    4
  8. Saturday, Oct 31. Drizzle. High 59°15°, low 40°4°. Typical 60°16° / 28°−2°. Rain 0.07 in1.8 mm, 30% chance. Forecasts differ.
    1. Morning

      6 AM–noon

      Partly sunny, 48°9°

      Dry

    2. Afternoon

      noon–6 PM

      Drizzle, 61°16°

      20% chance · 0.03 in0.7 mm

    3. Evening

      6 PM–midnight

      Drizzle, 45°7°

      30% chance · 0.04 in0.9 mm

    4. Overnight

      midnight–6 AM

      Drizzle, 36°2°

      Dry

    Hours this far out come from computer models only.

    The National Weather Service writes about seven days ahead; this day is our model forecast only.

    Forecasts differIndependent forecasts disagree; expect changes and plan for the range.

    High, likely
    54°12°–64°18°
    Low, likely
    37°3°–45°7°
    Typical high / low
    60°16° / 28°−2°
    Wind
    7 mph12 km/h, gusts 21 mph33 km/h
    UV peak
    4
  9. Sunday, Nov 1. Drizzle. High 49°9°, low 34°1°. Typical 59°15° / 28°−2°. Rain 0.11 in2.8 mm, 30% chance. Forecasts differ.
    1. Morning

      6 AM–noon

      Sunny, 39°4°

      Dry

    2. Afternoon

      noon–6 PM

      Sunny, 49°10°

      20% chance · 0.2 in0.4 cm

    3. Evening

      6 PM–midnight

      Clear, 41°5°

      30% chance

    4. Overnight

      midnight–6 AM

      Clear, 36°2°

      30% chance

    Hours this far out come from computer models only.

    The National Weather Service writes about seven days ahead; this day is our model forecast only.

    Forecasts differIndependent forecasts disagree; expect changes and plan for the range.

    High, likely
    39°4°–56°13°
    Low, likely
    31°−1°–37°3°
    Typical high / low
    59°15° / 28°−2°
    Wind
    28 mph46 km/h, gusts 52 mph84 km/h
    UV peak
    4
  10. Monday, Nov 2. Cloudy. High 53°12°, low 37°3°. Typical 59°15° / 28°−2°. Rain 0.06 in1.5 mm, 30% chance. Forecasts differ.
    1. Morning

      6 AM–noon

      Sunny, 42°6°

      20% chance

    2. Afternoon

      noon–6 PM

      Cloudy, 54°12°

      30% chance · 0.02 in0.5 mm

    3. Evening

      6 PM–midnight

      Cloudy, 45°7°

      30% chance

    Hours this far out come from computer models only.

    The National Weather Service writes about seven days ahead; this day is our model forecast only.

    Forecasts differIndependent forecasts disagree; expect changes and plan for the range.

    High, likely
    49°9°–56°13°
    Low, likely
    33°1°–42°6°
    Typical high / low
    59°15° / 28°−2°
    Wind
    10 mph16 km/h, gusts 29 mph47 km/h
    UV peak
    4

The outlook

  1. Today

    30% chance of rain, high 52°, low 37°.

  2. Tomorrow

    Dry, high 51°, low 41°.

  3. Monday

    Dry, high 57°, low 37°, warming up.

  4. Rest of week

    Mostly dry, highs 49–64°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (BOU) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue
Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Saint Vrain Creek at Lyons

6.9 mi
Below flood stage
Level
2.8 ft

Reading from Sat 4:15 AM · NWS gauge page

Saint Vrain Creek at Hygiene

7.3 mi
Below flood stage
Level
0.0 ft

Reading from Sat 4:45 AM · NWS gauge page

Boulder Creek (CO) below Broadway St

7.4 mi
Below flood stage
Level
1.0 ft
Flow
17 cfs

Reading from Sat 3:15 AM · NWS gauge page

Boulder Creek (CO) at North 75TH St.

7.9 mi
Below flood stage
Level
4.2 ft
Flow
2 cfs

Reading from Sat 4:15 AM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 71% less heating than a typical week.

This week 40Typical 139

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F
33
h below 17°F
0
h below 5°F
0

47, 17 and 5°F are the test points heat pumps are rated at. About 13 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 33°F).

Open the windows?

No stretch in the next few days is comfortable enough outside, by temperature, dew point and air quality.

Is this typical?

LONGMONT 2 ESE · official normals 1991–2020 · records 1893–2026

Oct 24, today vs a typical year

Today’s expected high is 10°6° colder than typical.

Normal high / low
62°17° / 30°−1°
Forecast high / low
52°11° / 37°3°
Record high
84°29° in 2003
Record low
8°−13° in 1942

Last 7 days vs normal

On average 9°5° warmer than normal (daily mean temperature).

  1. +5°+3°SunOct 18
  2. +9°+5°MonOct 19
  3. +6°+3°TueOct 20
  4. +9°+5°WedOct 21
  5. +13°+7°ThuOct 22
  6. +13°+7°FriOct 23
  7. —SatOct 24

Altona weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Sunrise 7:21 AM, sunset 6:08 PM.

Daylight
10 h 47 min
Losing 2 min 25 s a day; shortest Dec 21, 1 h 28 min less
Golden hour
5:30–6:25 PM
Morning 7:04–7:59 AM
Blue hour
6:25–6:36 PM
Morning 6:53–7:04 AM; first light 6:53 AM

Stars tonight? Unknown

Cloud forecast not available for tonight.

Moon

Waxing gibbous

96% lit · growing

Today
sets 5:38 AM · rises 5:07 PM
Full moon
Oct 25
New moon
Nov 9
Looking west from Altona. The highest point on the skyline is about 8,500 ft, 6 mi away.Skyline from USGS elevation data, heights drawn up to 2.5× taller. Sky, sun and moon as they are now.

UniColorado Heating & Cooling, a Denver HVAC installer

UniColorado Heating & Cooling installs heat pumps, furnaces and air conditioning across the Front Range. 12,000+ heat pumps installed since 2014.