Model estimate for 6:00 AM MDT (no recent station report)

Boulder, MT weather

Mostly clear and 21°−6°, 11°6° colder than usual, freeze watch tonight, low 21°−6°.

Forecasts differ

Now 21°−6°

Mostly clear

Wind: Calm; Up to 6 mph10 km/h through 6 PM
Dew point: 18°−8°; Dry · up to 26°−3° by 11 AM
Humidity: 88%; Air 21°−6°, dew point 18°−8° · frost likely
UV index: 0Low; Moderate 12–5 PM · peak 4

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Hard freeze until noon (low 21°−6°)
Above 30°−1° today by 11 AM
High 41°5° today at 2 PM
Hard freeze tonight 9 PM–noon (low 24°−4°)
Hard freeze tomorrow night from 8 PM (low 27°−3°)

This morningUp to 30°−1° by 11 AM · freezing, low 21°−6° · Clear
This afternoonUp to 41°5° by 2 PM · Partly cloudy
TonightDown to 26°−3° by 5 AM · freezing, low 26°−3° · Clear
Tomorrow morningUp to 32°0° by 11 AM · freezing, low 24°−4° · Partly cloudy
Tomorrow afternoonUp to 40°4° by 4 PM · Partly cloudy
Tomorrow nightDown to 27°−3° by 4 AM · freezing, low 27°−3° · Mostly cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 6a	Mostly clear	21°−6° (likely 16°−9° to 29°−2°)	21°−6°	0%	2 mph3 km/h from S, gusts 3 mph4 km/h	88%	21%	0
Sat 7a	Clear	21°−6° (likely 17°−8° to 29°−2°)	16°−9°	0%	3 mph5 km/h from S, gusts 3 mph6 km/h	92%	22%	0
Sat 8a	Sunny	21°−6° (likely 18°−8° to 28°−2°)	16°−9°	0%	3 mph5 km/h from S, gusts 5 mph8 km/h	93%	18%	0
Sat 9a	Sunny	22°−6° (likely 21°−6° to 30°−1°)	16°−9°	0%	5 mph8 km/h from S, gusts 5 mph8 km/h	92%	18%	0
Sat 10a	Mostly sunny	26°−3° (likely 26°−3° to 31°−1°)	22°−6°	0%	3 mph5 km/h from SE, gusts 9 mph14 km/h	85%	21%	1
Sat 11a	Mostly sunny	30°−1° (likely 29°−2° to 34°1°)	26°−3°	0%	5 mph8 km/h from SE, gusts 8 mph14 km/h	83%	25%	2
Sat 12p	Sunny	34°1° (likely 33°1° to 38°3°)	30°−1°	0%	5 mph8 km/h from SE, gusts 8 mph14 km/h	79%	9%	3
Sat 1p	Sunny	38°3° (likely 36°2° to 41°5°)	33°1°	0%	6 mph10 km/h from SE, gusts 8 mph13 km/h	75%	9%	4
Sat 2p	Mostly sunny	41°5° (likely 38°3° to 43°6°)	37°3°	0%	6 mph10 km/h from SE, gusts 7 mph11 km/h	72%	23%	4
Sat 3p	Partly sunny	40°4° (likely 39°4° to 45°7°)	36°2°	0%	6 mph10 km/h from SE, gusts 8 mph13 km/h	69%	46%	3
Sat 4p	Partly sunny	40°4° (likely 38°3° to 45°7°)	37°3°	0%	5 mph8 km/h from SE, gusts 9 mph14 km/h	68%	44%	3
Sat 5p	Partly sunny	41°5° (likely 36°2° to 44°7°)	39°4°	0%	3 mph5 km/h from SE, gusts 9 mph14 km/h	67%	50%	2
Sat 6p	Mostly clear	37°3° (likely 33°1° to 41°5°)	34°1°	0%	3 mph5 km/h from SE, gusts 7 mph11 km/h	74%	50%	1
Sat 7p	Mostly clear	34°1° (likely 30°−1° to 38°3°)	34°1°	0%	2 mph3 km/h from SSE, gusts 6 mph10 km/h	83%	45%	0
Sat 8p	Partly cloudy	34°1° (likely 29°−2° to 36°2°)	34°1°	0%	2 mph3 km/h from WSW, gusts 5 mph8 km/h	80%	42%	0
Sat 9p	Clear	30°−1° (likely 27°−3° to 36°2°)	30°−1°	0%	2 mph3 km/h from WSW, gusts 4 mph6 km/h	82%	26%	0
Sat 10p	Clear	30°−1° (likely 27°−3° to 35°2°)	30°−1°	0%	1 mph2 km/h from SW, gusts 3 mph5 km/h	81%	8%	0
Sat 11p	Partly cloudy	30°−1° (likely 26°−3° to 36°2°)	30°−1°	0%	1 mph2 km/h from WSW, gusts 3 mph5 km/h	79%	37%	0
Sun 12a	Partly cloudy	30°−1° (likely 26°−3° to 36°2°)	30°−1°	0%	1 mph2 km/h from WSW, gusts 3 mph4 km/h	79%	22%	0
Sun 1a	Partly cloudy	30°−1° (likely 26°−3° to 36°2°)	30°−1°	0%	0 mph0 km/h, gusts 2 mph3 km/h	78%	19%	0
Sun 2a	Clear	29°−2° (likely 25°−4° to 36°2°)	29°−2°	0%	0 mph0 km/h, gusts 2 mph3 km/h	79%	2%	0
Sun 3a	Clear	28°−2° (likely 25°−4° to 36°2°)	28°−2°	0%	0 mph0 km/h, gusts 2 mph4 km/h	78%	1%	0
Sun 4a	Clear	28°−2° (likely 24°−4° to 36°2°)	28°−2°	0%	0 mph0 km/h, gusts 3 mph5 km/h	78%	7%	0
Sun 5a	Mostly clear	26°−3° (likely 24°−4° to 37°3°)	26°−3°	0%	0 mph0 km/h, gusts 2 mph4 km/h	80%	37%	0
Sun 6a	Mostly clear	26°−3° (likely 22°−6° to 36°2°)	26°−3°	0%	0 mph0 km/h, gusts 3 mph4 km/h	82%	58%	0
Sun 7a	Mostly clear	25°−4° (likely 22°−6° to 36°2°)	25°−4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	86%	63%	0
Sun 8a	Mostly sunny	24°−4° (likely 23°−5° to 34°1°)	24°−4°	0%	0 mph0 km/h, gusts 7 mph12 km/h	89%	37%	0
Sun 9a	Partly sunny	25°−4° (likely 25°−4° to 34°1°)	25°−4°	0%	2 mph3 km/h from NNE, gusts 5 mph8 km/h	89%	44%	0
Sun 10a	Partly sunny	29°−2° (likely 29°−2° to 37°3°)	29°−2°	0%	2 mph3 km/h from NNE, gusts 8 mph13 km/h	86%	42%	1
Sun 11a	Partly sunny	32°0° (likely 32°0° to 40°4°)	32°0°	0%	2 mph3 km/h from NNE, gusts 8 mph13 km/h	84%	42%	2
Sun 12p	Partly sunny	35°2° (likely 34°1° to 43°6°)	31°−1°	0%	5 mph8 km/h from E, gusts 8 mph13 km/h	80%	36%	3
Sun 1p	Partly sunny	38°3° (likely 36°2° to 45°7°)	34°1°	0%	5 mph8 km/h from E, gusts 9 mph14 km/h	75%	49%	4
Sun 2p	Cloudy	39°4° (likely 39°4° to 46°8°)	36°2°	0%	5 mph8 km/h from E, gusts 10 mph15 km/h	74%	57%	4
Sun 3p	Partly sunny	39°4° (likely 39°4° to 46°8°)	36°2°	0%	5 mph8 km/h from E, gusts 11 mph17 km/h	73%	26%	3
Sun 4p	Partly sunny	40°4° (likely 40°4° to 45°7°)	37°3°	0%	5 mph8 km/h from E, gusts 11 mph18 km/h	71%	48%	3
Sun 5p	Partly sunny	39°4° (likely 38°3° to 44°7°)	36°2°	0%	5 mph8 km/h from E, gusts 11 mph18 km/h	69%	45%	2
Sun 6p	Partly cloudy	36°2° (likely 34°1° to 41°5°)	36°2°	0%	2 mph3 km/h from NE, gusts 11 mph17 km/h	74%	41%	1
Sun 7p	Partly cloudy	34°1° (likely 32°0° to 37°3°)	34°1°	0%	2 mph3 km/h from NE, gusts 8 mph13 km/h	81%	56%	0
Sun 8p	Mostly clear	32°0° (likely 29°−2° to 34°1°)	32°0°	0%	2 mph3 km/h from NE, gusts 5 mph8 km/h	83%	62%	0
Sun 9p	Partly cloudy	30°−1° (likely 28°−2° to 34°1°)	30°−1°	0%	1 mph2 km/h from E, gusts 4 mph7 km/h	82%	61%	0
Sun 10p	Partly cloudy	29°−2° (likely 26°−3° to 34°1°)	29°−2°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	82%	71%	0
Sun 11p	Partly cloudy	29°−2° (likely 25°−4° to 33°1°)	29°−2°	0%	1 mph2 km/h from E, gusts 3 mph5 km/h	82%	77%	0
Mon 12a	Cloudy	29°−2° (likely 24°−4° to 33°1°)	29°−2°	0%	1 mph2 km/h from SSE, gusts 3 mph4 km/h	82%	81%	0
Mon 1a	Cloudy	29°−2° (likely 19°−7° to 32°0°)	29°−2°	0%	1 mph2 km/h from SSE, gusts 4 mph6 km/h	83%	75%	0
Mon 2a	Mostly cloudy	28°−2° (likely 20°−7° to 32°0°)	28°−2°	0%	1 mph2 km/h from SSE, gusts 3 mph5 km/h	83%	82%	0
Mon 3a	Partly cloudy	28°−2° (likely 21°−6° to 32°0°)	28°−2°	0%	1 mph2 km/h from S, gusts 3 mph5 km/h	84%	76%	0
Mon 4a	Mostly cloudy	27°−3° (likely 22°−6° to 32°0°)	27°−3°	0%	1 mph2 km/h from S, gusts 3 mph5 km/h	84%	79%	0
Mon 5a	Mostly cloudy	27°−3° (likely 22°−6° to 31°−1°)	27°−3°	0%	1 mph2 km/h from S, gusts 3 mph4 km/h	85%	82%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Cloudy. High 42°6°, low 24°−4°. Typical 53°12° / 25°−4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 21°−6°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 41°5°
  Dry
3. Evening
  6 PM–midnight
  Clear, 34°1°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 26°−3°
  Dry
Official NWS forecast
Today: Areas of fog between 7am and 10am. Sunny, with a high near 42. South southeast wind 2 to 6 mph.
Tonight: Partly cloudy, with a low around 24. Southwest wind 0 to 3 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
39°4°–45°7°
Low, likely
16°−9°–27°−3°
Typical high / low
53°12° / 25°−4°
Wind
9 mph14 km/h
UV peak
4
Tomorrow, Oct 25. Partly sunny. High 41°5°, low 26°−3°. Typical 53°12° / 24°−4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 24°−4°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 40°4°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 32°0°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 27°−3°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 41. Northeast wind 0 to 5 mph.
Night: Partly cloudy, with a low around 26. Southeast wind around 2 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
41°5°–46°8°
Low, likely
21°−6°–32°0°
Typical high / low
53°12° / 24°−4°
Wind
12 mph19 km/h
UV peak
4
Monday, Oct 26. Mostly cloudy. High 47°8°, low 31°−1°. Typical 52°11° / 24°−4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 28°−2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 51°11°
  Dry
3. Evening
  6 PM–midnight
  Clear, 39°4°
  30% chance · 0.02 in0.5 mm
4. Overnight
  midnight–6 AM
  Drizzle, 34°1°
  40% chance · 0.09 in2.3 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 47. South wind 2 to 6 mph.
Night: A chance of rain before midnight, then a chance of rain and snow. Mostly cloudy, with a low around 31. South southwest wind around 5 mph. Chance of precipitation is 40%.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
45°7°–54°12°
Low, likely
21°−6°–31°−1°
Typical high / low
52°11° / 24°−4°
Wind
8 mph12 km/h, gusts 16 mph26 km/h
UV peak
3
Tuesday, Oct 27. Snow. High 44°7°, low 26°−3°. Typical 52°11° / 24°−4°. Snow < 1 in< 2 cm, 50% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 34°1°
  40% chance · 0.06 in1.6 mm
2. Afternoon
  noon–6 PM
  Drizzle, 45°7°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 36°2°
  20% chance
4. Overnight
  midnight–6 AM
  Partly cloudy, 32°0°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain and snow. Partly sunny, with a high near 44. West southwest wind 3 to 10 mph, with gusts as high as 18 mph.
Night: A chance of rain before 9pm, then a chance of rain and snow. Mostly cloudy, with a low around 26. West southwest wind 5 to 8 mph. Little or no snow accumulation expected.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
42°6°–45°7°
Low, likely
26°−3°–36°2°
Typical high / low
52°11° / 24°−4°
Wind
15 mph23 km/h, gusts 31 mph49 km/h
UV peak
2
Wednesday, Oct 28. Snow. High 43°6°, low 26°−3°. Typical 51°11° / 24°−4°. Snow, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 31°−1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 46°8°
  Dry
3. Evening
  6 PM–midnight
  Clear, 37°3°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 32°0°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of snow before noon. Mostly sunny, with a high near 43.
Night: A slight chance of rain and snow before midnight. Mostly cloudy, with a low around 26.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
43°6°–48°9°
Low, likely
25°−4°–34°1°
Typical high / low
51°11° / 24°−4°
Wind
10 mph16 km/h, gusts 24 mph39 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 42°6°, low 26°−3°. Typical 51°11° / 23°−5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 31°0°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 47°8°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 38°3°
  20% chance · 0.02 in0.5 mm
4. Overnight
  midnight–6 AM
  Cloudy, 34°1°
  20% chance · 0.2 in0.4 cm
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 42.
Night: A slight chance of snow. Mostly cloudy, with a low around 26.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
42°6°–49°9°
Low, likely
26°−3°–33°1°
Typical high / low
51°11° / 23°−5°
Wind
6 mph10 km/h, gusts 15 mph25 km/h
UV peak
3
Friday, Oct 30. Snow. High 45°7°, low 27°−3°. Typical 50°10° / 23°−5°. Snow 0–2 in0–5 cm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 34°1°
  30% chance · 0.03 in0.7 mm
2. Afternoon
  noon–6 PM
  Rain, 44°7°
  30% chance · 0.07 in1.7 mm
3. Evening
  6 PM–midnight
  Rain, 36°2°
  30% chance · 0.4 in1 cm
4. Overnight
  midnight–6 AM
  Cloudy, 31°−1°
  30% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of snow. Partly sunny, with a high near 45.
Night: A slight chance of snow before 9pm, then a chance of rain and snow. Mostly cloudy, with a low around 27.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
38°3°–48°9°
Low, likely
27°−3°–34°1°
Typical high / low
50°10° / 23°−5°
Wind
5 mph8 km/h, gusts 11 mph18 km/h
Saturday, Oct 31. Drizzle. High 38°3°, low 26°−3°. Typical 50°10° / 23°−5°. Rain 0.04 in1 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 32°0°
  20% chance
2. Afternoon
  noon–6 PM
  Drizzle, 38°3°
  Dry
3. Evening
  6 PM–midnight
  Clear, 30°−1°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 25°−4°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
36°2°–40°4°
Low, likely
24°−4°–27°−3°
Typical high / low
50°10° / 23°−5°
Wind
12 mph19 km/h, gusts 18 mph28 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 40°4°, low 25°−4°. Typical 49°9° / 22°−6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 27°−3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 41°5°
  Dry
3. Evening
  6 PM–midnight
  Clear, 34°1°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 33°1°
  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
36°2°–47°8°
Low, likely
20°−7°–29°−2°
Typical high / low
49°9° / 22°−6°
Wind
10 mph16 km/h, gusts 29 mph47 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 44°7°, low 30°−1°. Typical 49°9° / 22°−6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 47°9°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 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
36°2°–57°14°
Low, likely
26°−3°–35°2°
Typical high / low
49°9° / 22°−6°
Wind
6 mph10 km/h, gusts 19 mph31 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 42°, low 24°.
Tomorrow
Dry, high 41°, low 26°.
Monday
Dry, high 47°, low 31°, warming up.
Rest of week
Highs 38–45°; chance of precipitation on Tuesday.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (TFX) (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

Boulder River (Central MT) near Boulder

2.2 mi

Level: 5.6 ft
Flow: 135 cfs

Reading from Sat 4:15 AM · NWS gauge page

Tenmile Creek (MT) near Rimini

21 mi

Level: 1.9 ft
Flow: 17 cfs

Reading from Sat 4:45 AM · NWS gauge page

Prickly Pear Creek near Clancy

21 mi

Level: 1.1 ft
Flow: 51 cfs

Reading from Fri 10:30 PM · NWS gauge page

For your home

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

Pipes: watch the cold

Tonight’s low: 21°−6°

Overnight low near 21°F — not yet at drip-the-faucets cold, but worth watching if it's forecast to drop further.

Heating this week

About 65% less heating than a typical week.

This week 66Typical 191

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 47
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 17 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 18°F). Indoor air will run dry too — a humidifier keeping indoor relative humidity in the 30–50% range is more comfortable and cuts static shocks, without going so high it fogs cold windows.

Open the windows?

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

Is this typical?

Boulder · official normals 1991–2020 · records 1880–2026

Oct 24, today vs a typical year

Today’s expected high is 11°6° colder than typical.

Last 7 days vs normal

On average 5°3° warmer than normal (daily mean temperature).

+4°+2°SunOct 18
+4°+2°MonOct 19
+9°+5°TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23
—SatOct 24

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

Sun & moon

Sun

Daylight: 10 h 28 min; Losing 3 min 3 s a day; shortest Dec 21, 1 h 51 min less
Golden hour: 5:44–6:45 PM; Morning 7:39–8:40 AM
Blue hour: 6:45–6:56 PM; Morning 7:27–7:39 AM; first light 7:27 AM

Stars tonight? Good

Mostly clear 6:05–7:27 AM; moon 96% lit but below the horizon.

Moon

Waxing gibbous

96% lit · growing

Today: sets 6:13 AM · rises 5:27 PM
Full moon: Oct 25
New moon: Nov 9

Looking northwest from Boulder. The highest point on the skyline is about 8,700 ft, 11 mi away.Skyline from USGS elevation data, heights drawn up to 4.5× taller. Sky, sun and moon as they are now.