Missouri River at Helena Valley Reservoir
4.1 mi- Level
- 3818 ft
Reading from Sat 7:15 PM · NWS gauge page
Observed 7:55 PM MDT at KHLN
East Helena, MT weather
Clear and 34°1°, 11°6° colder than a typical Oct 24, freeze watch tonight, low 21°−6°.
Today: low 20°−7° (likely 17°−8° to 27°−3°), high 42°6° (likely 41°5° to 43°6°).
Now 34°1°
Clear · Feels like 30°−1°
- Wind
- 5 mph7 km/h
- From the west. Up to 5 mph8 km/h through 8 AM
- Dew point
- 30°−1°
- Dry · down to 22°−6° by 7 AM
- UV tomorrow
- 3Moderate
- Moderate 12–4 PM · peak 3
- Air quality
- 27Good
- Main pollutant: PM2.5 (fine particles)
Next 2 hours
No precipitation expected in the next 2 hours.
From forecast models
Next 48 hours
About the same as this time yesterday (34°1° then, 33°1° now)
Good hours for
TonightDown to 23°−5° by 5 AM · freezing, low 23°−5° · Clear
Tomorrow morningUp to 30°−1° by 11 AM · Partly cloudy · freezing, low 21°−6°
Tomorrow afternoonUp to 39°4° by 4 PM · freezing, low 32°0° · Mostly cloudy
Tomorrow nightDown to 22°−6° by 5 AM · freezing, low 22°−6° · Mostly cloudy
Monday morningUp to 33°1° by 11 AM · freezing, low 21°−6° · Mostly cloudy
Monday afternoonUp to 46°8° by 3 PM · Partly cloudy
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 8p | Partly cloudy | 32°0° (likely 31°−1° to 35°2°) | 32°0° | 0% | 2 mph3 km/h from SW, gusts 2 mph4 km/h | 87% | 19% | 0 |
| Sat 9p | Partly cloudy | 31°−1° (likely 30°−1° to 34°1°) | 28°−2° | 0% | 3 mph5 km/h from SW, gusts 2 mph4 km/h | 86% | 25% | 0 |
| Sat 10p | Clear | 30°−1° (likely 29°−2° to 33°1°) | 26°−3° | 0% | 3 mph5 km/h from WSW, gusts 4 mph6 km/h | 88% | 15% | 0 |
| Sat 11p | Mostly clear | 28°−2° (likely 28°−2° to 33°1°) | 28°−2° | 0% | 2 mph3 km/h from SW, gusts 5 mph7 km/h | 91% | 23% | 0 |
| Sun 12a | Clear | 28°−2° (likely 28°−2° to 33°1°) | 28°−2° | 0% | 2 mph3 km/h from W, gusts 4 mph6 km/h | 90% | 13% | 0 |
| Sun 1a | Clear | 26°−3° (likely 26°−3° to 33°1°) | 26°−3° | 0% | 1 mph2 km/h from W, gusts 4 mph6 km/h | 96% | 19% | 0 |
| Sun 2a | Clear | 25°−4° (likely 25°−4° to 33°1°) | 25°−4° | 0% | 1 mph2 km/h from W, gusts 5 mph8 km/h | 96% | 19% | 0 |
| Sun 3a | Clear | 25°−4° (likely 25°−4° to 33°1°) | 25°−4° | 0% | 2 mph3 km/h from W, gusts 4 mph6 km/h | 96% | 9% | 0 |
| Sun 4a | Clear | 24°−4° (likely 24°−4° to 33°1°) | 24°−4° | 0% | 2 mph3 km/h from WNW, gusts 3 mph6 km/h | 98% | 2% | 0 |
| Sun 5a | Clear | 23°−5° (likely 23°−5° to 32°0°) | 18°−8° | 0% | 3 mph5 km/h from W, gusts 5 mph8 km/h | 100% | 10% | 0 |
| Sun 6a | Clear | 23°−5° (likely 23°−5° to 32°0°) | 17°−8° | 0% | 5 mph8 km/h from W, gusts 5 mph8 km/h | 100% | 21% | 0 |
| Sun 7a | Clear | 22°−6° (likely 22°−6° to 33°1°) | 17°−8° | 0% | 3 mph5 km/h from WNW, gusts 7 mph11 km/h | 100% | 25% | 0 |
| Sun 8a | Fog | 21°−6° (likely 21°−6° to 33°1°) | 16°−9° | 0% | 3 mph5 km/h from W, gusts 8 mph12 km/h | 100% | 44% | 0 |
| Sun 9a | Mostly sunny | 25°−4° (likely 25°−4° to 33°1°) | 21°−6° | 0% | 3 mph5 km/h from W, gusts 8 mph13 km/h | 100% | 61% | 0 |
| Sun 10a | Fog | 28°−2° (likely 28°−2° to 35°2°) | 24°−4° | 0% | 3 mph5 km/h from WNW, gusts 8 mph13 km/h | 100% | 49% | 1 |
| Sun 11a | Fog | 30°−1° (likely 30°−1° to 36°2°) | 26°−3° | 0% | 3 mph5 km/h from NW, gusts 9 mph14 km/h | 99% | 54% | 1 |
| Sun 12p | Partly sunny | 32°0° (likely 32°0° to 38°3°) | 29°−2° | 0% | 3 mph5 km/h from NW, gusts 9 mph15 km/h | 90% | 77% | 3 |
| Sun 1p | Partly sunny | 34°1° (likely 34°1° to 39°4°) | 31°−1° | 0% | 3 mph5 km/h from NW, gusts 9 mph15 km/h | 86% | 56% | 3 |
| Sun 2p | Mostly sunny | 36°2° (likely 36°2° to 40°4°) | 33°1° | 0% | 3 mph5 km/h from NNW, gusts 9 mph15 km/h | 79% | 61% | 3 |
| Sun 3p | Mostly sunny | 38°3° (likely 38°3° to 40°4°) | 36°2° | 0% | 3 mph5 km/h from NNW, gusts 9 mph15 km/h | 73% | 68% | 3 |
| Sun 4p | Mostly sunny | 39°4° (likely 38°3° to 40°4°) | 37°3° | 0% | 3 mph5 km/h from NNW, gusts 10 mph16 km/h | 73% | 64% | 2 |
| Sun 5p | Mostly sunny | 39°4° (likely 36°2° to 40°4°) | 37°3° | 0% | 3 mph5 km/h from NNW, gusts 11 mph17 km/h | 73% | 53% | 1 |
| Sun 6p | Mostly cloudy | 36°2° (likely 34°1° to 37°3°) | 33°1° | 0% | 3 mph5 km/h from WNW, gusts 11 mph18 km/h | 74% | 56% | 0 |
| Sun 7p | Mostly cloudy | 33°1° (likely 32°0° to 34°1°) | 30°−1° | 0% | 3 mph5 km/h from WNW, gusts 10 mph16 km/h | 83% | 57% | 0 |
| Sun 8p | Mostly cloudy | 31°−1° (likely 30°−1° to 33°1°) | 28°−2° | 0% | 3 mph5 km/h from WNW, gusts 8 mph14 km/h | 88% | 67% | 0 |
| Sun 9p | Cloudy | 29°−2° (likely 29°−2° to 32°0°) | 29°−2° | 0% | 2 mph3 km/h from W, gusts 8 mph13 km/h | 86% | 71% | 0 |
| Sun 10p | Cloudy | 28°−2° (likely 28°−2° to 32°0°) | 28°−2° | 0% | 2 mph3 km/h from W, gusts 7 mph11 km/h | 88% | 72% | 0 |
| Sun 11p | Cloudy | 27°−3° (likely 27°−3° to 32°0°) | 27°−3° | 0% | 2 mph3 km/h from W, gusts 7 mph10 km/h | 93% | 89% | 0 |
| Mon 12a | Cloudy | 27°−3° (likely 27°−3° to 32°0°) | 27°−3° | 0% | 1 mph2 km/h from W, gusts 6 mph9 km/h | 91% | 88% | 0 |
| Mon 1a | Cloudy | 25°−4° (likely 25°−4° to 32°0°) | 25°−4° | 0% | 1 mph2 km/h from W, gusts 5 mph8 km/h | 96% | 92% | 0 |
| Mon 2a | Cloudy | 24°−4° (likely 24°−4° to 32°0°) | 24°−4° | 0% | 1 mph2 km/h from W, gusts 4 mph7 km/h | 97% | 94% | 0 |
| Mon 3a | Cloudy | 23°−5° (likely 23°−5° to 32°0°) | 23°−5° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 96% | 94% | 0 |
| Mon 4a | Cloudy | 23°−5° (likely 23°−5° to 33°1°) | 23°−5° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 99% | 96% | 0 |
| Mon 5a | Cloudy | 22°−6° (likely 22°−6° to 32°0°) | 22°−6° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 97% | 0 |
| Mon 6a | Cloudy | 21°−6° (likely 21°−6° to 32°0°) | 21°−6° | 0% | 1 mph2 km/h from S, gusts 3 mph5 km/h | 99% | 96% | 0 |
| Mon 7a | Mostly cloudy | 22°−6° (likely 22°−6° to 32°0°) | 22°−6° | 0% | 1 mph2 km/h from S, gusts 3 mph5 km/h | 100% | 66% | 0 |
| Mon 8a | Cloudy | 23°−5° (likely 23°−5° to 32°0°) | 23°−5° | 0% | 1 mph2 km/h from S, gusts 2 mph3 km/h | 100% | 96% | 0 |
| Mon 9a | Cloudy | 24°−4° (likely 24°−4° to 32°0°) | 24°−4° | 0% | 2 mph3 km/h from SE, gusts 2 mph3 km/h | 100% | 86% | 0 |
| Mon 10a | Cloudy | 28°−2° (likely 28°−2° to 34°1°) | 28°−2° | 0% | 2 mph3 km/h from SE, gusts 2 mph4 km/h | 96% | 61% | 1 |
| Mon 11a | Mostly sunny | 33°1° (likely 32°0° to 38°3°) | 33°1° | 0% | 2 mph3 km/h from SE, gusts 4 mph7 km/h | 89% | 57% | 2 |
| Mon 12p | Partly sunny | 38°3° (likely 34°1° to 41°5°) | 38°3° | 0% | 2 mph3 km/h from ESE, gusts 3 mph5 km/h | 82% | 47% | 3 |
| Mon 1p | Partly sunny | 42°6° (likely 37°3° to 44°7°) | 42°6° | 0% | 2 mph3 km/h from ESE, gusts 4 mph6 km/h | 75% | 49% | 3 |
| Mon 2p | Partly sunny | 45°7° (likely 40°4° to 46°8°) | 45°7° | 0% | 2 mph3 km/h from ESE, gusts 6 mph9 km/h | 69% | 33% | 3 |
| Mon 3p | Sunny | 46°8° (likely 43°6° to 48°9°) | 45°7° | 0% | 3 mph5 km/h from ESE, gusts 6 mph9 km/h | 66% | 30% | 2 |
| Mon 4p | Partly sunny | 46°8° (likely 44°7° to 50°10°) | 45°7° | 0% | 3 mph5 km/h from ESE, gusts 5 mph9 km/h | 66% | 39% | 2 |
| Mon 5p | Partly sunny | 44°7° (likely 43°6° to 49°9°) | 42°6° | 0% | 3 mph5 km/h from ESE, gusts 5 mph8 km/h | 69% | 76% | 1 |
| Mon 6p | Cloudy | 42°6° (likely 40°4° to 46°8°) | 40°4° | 40% | 3 mph5 km/h from SSE, gusts 3 mph5 km/h | 73% | 64% | 0 |
| Mon 7p | Rain | 40°4° (likely 35°2° to 43°6°) | 38°3° | 40% | 3 mph5 km/h from SSE, gusts 4 mph6 km/h | 78% | 49% | 0 |
Days ahead
Shaded: typical range for these dates (1991–2020)
Today, Oct 24. Partly sunny. High 42°6°, low 20°−7°. Typical 53°12° / 30°−1°. Dry. Mostly agree.
Evening
6 PM–midnight
Clear, 32°0°Dry
Overnight
midnight–6 AM
Clear, 23°−5°Dry
Official NWS forecast
Tonight: Areas of fog after 1am. Mostly clear. Low around 20, with temperatures rising to around 23 overnight. West wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 41°5°–43°6°
- Low, likely
- 17°−8°–27°−3°
- Typical high / low
- 53°12° / 30°−1°
- Wind
- 10 mph16 km/h
- UV peak
- 4
Tomorrow, Oct 25. Cloudy. High 39°4°, low 19°−7°. Typical 53°12° / 30°−1°. Dry. Forecasts agree.
Morning
6 AM–noon
Mostly sunny, 21°−6°Dry
Afternoon
noon–6 PM
Mostly sunny, 39°4°Dry
Evening
6 PM–midnight
Cloudy, 31°−1°Dry
Overnight
midnight–6 AM
Cloudy, 22°−6°Dry
Official NWS forecast
Day: Patchy fog before noon. Mostly sunny, with a high near 39. West northwest wind around 5 mph.
Night: Mostly cloudy. Low around 19, with temperatures rising to around 22 overnight. West wind 0 to 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 39°4°–40°4°
- Low, likely
- 19°−7°–32°0°
- Typical high / low
- 53°12° / 30°−1°
- Wind
- 10 mph16 km/h
- UV peak
- 3
Monday, Oct 26. Partly sunny. High 46°8°, low 26°−3°. Typical 52°11° / 30°−1°. Dry. Mostly agree.
Morning
6 AM–noon
Cloudy, 23°−5°Dry
Afternoon
noon–6 PM
Sunny, 46°8°Dry
Evening
6 PM–midnight
Rain, 37°3°40% chance · 0.02 in0.5 mm
Overnight
midnight–6 AM
Showers, 36°2°50% chance · 0.09 in2.4 mm
Official NWS forecast
Day: Mostly sunny, with a high near 46. South southeast wind around 3 mph.
Night: A chance of rain before midnight, then a chance of rain and snow. Mostly cloudy, with a low around 26. South wind around 5 mph. Chance of precipitation is 40%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 45°7°–49°9°
- Low, likely
- 26°−3°–30°−1°
- Typical high / low
- 52°11° / 30°−1°
- Wind
- 7 mph12 km/h
- UV peak
- 3
Tuesday, Oct 27. Rain. High 47°8°, low 23°−5°. Typical 52°11° / 29°−2°. Rain 0.12 in3 mm, 50% chance. Mostly agree.
Morning
6 AM–noon
Drizzle, 38°3°50% chance · 0.03 in0.7 mm
Afternoon
noon–6 PM
Mostly sunny, 49°9°30% chance
Evening
6 PM–midnight
Partly cloudy, 37°3°Dry
Overnight
midnight–6 AM
Partly cloudy, 31°−1°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain. Mostly cloudy, with a high near 47. West southwest wind 3 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Night: A slight chance of rain before midnight. Mostly cloudy, with a low around 23. Southwest wind 5 to 8 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 47°8°–50°10°
- Low, likely
- 23°−5°–36°2°
- Typical high / low
- 52°11° / 29°−2°
- Wind
- 15 mph24 km/h, gusts 30 mph48 km/h
- UV peak
- 3
Wednesday, Oct 28. Cloudy. High 48°9°, low 22°−6°. Typical 51°11° / 29°−2°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 29°−2°Dry
Afternoon
noon–6 PM
Sunny, 50°10°Dry
Evening
6 PM–midnight
Partly cloudy, 38°3°Dry
Overnight
midnight–6 AM
Cloudy, 31°−1°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 48. South wind around 5 mph.
Night: Mostly cloudy, with a low around 22.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 47°8°–52°11°
- Low, likely
- 22°−6°–31°−1°
- Typical high / low
- 51°11° / 29°−2°
- Wind
- 10 mph16 km/h, gusts 16 mph26 km/h
- UV peak
- 3
Thursday, Oct 29. Mostly cloudy. High 44°7°, low 22°−6°. Typical 51°11° / 28°−2°. Dry. Forecasts differ.
Morning
6 AM–noon
Partly sunny, 29°−1°Dry
Afternoon
noon–6 PM
Sunny, 43°6°Dry
Evening
6 PM–midnight
Cloudy, 35°2°30% chance
Overnight
midnight–6 AM
Mostly clear, 29°−2°40% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 44.
Night: A slight chance of rain and snow. Mostly cloudy, with a low around 22.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 39°4°–46°8°
- Low, likely
- 22°−6°–31°−1°
- Typical high / low
- 51°11° / 28°−2°
- Wind
- 8 mph13 km/h, gusts 15 mph24 km/h
- UV peak
- 3
Friday, Oct 30. Snow. High 44°7°, low 22°−6°. Typical 50°10° / 28°−2°. Snow 0.02 in0.5 mm, 20% chance. Forecasts differ.
Morning
6 AM–noon
Cloudy, 29°−2°30% chance
Afternoon
noon–6 PM
Cloudy, 41°5°30% chance
Evening
6 PM–midnight
Drizzle, 36°2°20% chance · 0.02 in0.4 mm
Overnight
midnight–6 AM
Drizzle, 30°−1°20% chance · 0.02 in0.6 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of snow before noon, then a slight chance of rain and snow. Partly sunny, with a high near 44.
Night: A slight chance of rain and snow before midnight. Mostly cloudy, with a low around 22.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 37°3°–45°7°
- Low, likely
- 22°−6°–31°−1°
- Typical high / low
- 50°10° / 28°−2°
- Wind
- 6 mph9 km/h, gusts 17 mph27 km/h
- UV peak
- 3
Saturday, Oct 31. Mostly cloudy. High 45°7°, low 28°−2°. Typical 50°10° / 28°−2°. Dry. Forecasts differ.
Morning
6 AM–noon
Cloudy, 30°−1°Dry
Afternoon
noon–6 PM
Mostly sunny, 42°5°Dry
Evening
6 PM–midnight
Clear, 37°3°Dry
Overnight
midnight–6 AM
Clear, 33°0°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 45.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 37°3°–53°12°
- Low, likely
- 14°−10°–36°2°
- Typical high / low
- 50°10° / 28°−2°
- Wind
- 13 mph21 km/h, gusts 22 mph36 km/h
- UV peak
- 3
Sunday, Nov 1. Snow. High 46°8°, low 31°−1°. Typical 49°9° / 27°−3°. Snow 0–4 in0–10 cm, 10% chance. Forecasts differ.
Morning
6 AM–noon
Snow, 35°1°Dry
Afternoon
noon–6 PM
Sunny, 46°8°Dry
Evening
6 PM–midnight
Partly cloudy, 40°4°Dry
Overnight
midnight–6 AM
Cloudy, 34°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
- 42°6°–51°11°
- Low, likely
- 27°−3°–34°1°
- Typical high / low
- 49°9° / 27°−3°
- Wind
- 15 mph25 km/h, gusts 30 mph49 km/h
- UV peak
- 3
Monday, Nov 2. Cloudy. High 47°8°, low 32°0°. Typical 49°9° / 27°−3°. Dry. Forecasts differ.
Morning
6 AM–noon
Partly sunny, 38°3°Dry
Afternoon
noon–6 PM
Cloudy, 48°9°Dry
Evening
6 PM–midnight
Clear, 35°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
- 41°5°–53°12°
- Low, likely
- 29°−2°–34°1°
- Typical high / low
- 49°9° / 27°−3°
- Wind
- 13 mph21 km/h, gusts 38 mph61 km/h
- UV peak
- 3
The outlook
Today
Dry, high 42°, low 20°.
Tomorrow
Dry, high 39°, low 19°, cooling off.
Monday
Dry, high 46°, low 26°, warming up.
Rest of week
Highs 44–48°; 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
Rivers
NOAA river gauges within 25 mi
Below flood stage
Prickly Pear Creek near Clancy
4.7 mi- Level
- 0.9 ft
- Flow
- 38 cfs
Reading from Sat 7:30 PM · NWS gauge page
Tenmile Creek (MT) near Helena
8.1 mi- Level
- 2.6 ft
- Flow
- 35 cfs
Reading from Sat 7:15 PM · NWS gauge page
Missouri River at Canyon Ferry Reservoir
10 mi- Level
- 3785 ft
Reading from Sat 7 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 61% less heating than a typical week.
This week 68Typical 172
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 15 hours are near freezing and damp, when outdoor units defrost more often.
Comfort
Dry air outside (dew point 30°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?
Helena Airport Asos · official normals 1991–2020 · records 1880–2026
Oct 24, today vs a typical year
Today’s expected high is 11°6° colder than typical.
- Normal high / low
- 53°12° / 30°−1°
- Forecast high / low
- 42°6° / 20°−7°
- Record high
- 72°22° in 1959
- Record low
- −1°−18° in 1919
Last 7 days vs normal
On average 4°2° warmer than normal (daily mean temperature).
- +5°+3°MonOct 19
- +6°+3°TueOct 20
- +5°+3°WedOct 21
- +8°+4°ThuOct 22
- −1°FriOct 23
- —SatOct 24
- —SunOct 25
East Helena weather by month: normals, records, snow and freeze dates
Sun & moon
Sun
Sunrise 7:58 AM, sunset 6:24 PM.
- Daylight
- 10 h 27 min
- Losing 3 min 8 s a day; shortest Dec 21, 1 h 53 min less
- Golden hour
- 5:42–6:43 PM
- Morning 7:39–8:40 AM
- Blue hour
- 6:43–6:55 PM
- Morning 7:27–7:39 AM; first light 7:27 AM
Stars tonight? Fair
Mostly clear 8:44 PM–7:28 AM, but the moon is 99% lit and up.
Moon
Waxing gibbous
98% lit · growing
- Today
- sets 6:12 AM · rises 5:25 PM
- Full moon
- Oct 25
- New moon
- Nov 9
