Helena, Montana Weather
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Climate of Helena: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Helena, with average daytime highs around 27°C. January is the coolest, when nights typically fall to about -13°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 39°C, so the seasons feel very different from each other.
The area receives about 550 mm of rain in a typical year. Rainfall is modest in every month; June is the wettest at about 83 mm.
For outdoor plans and travel, June to August usually offer the most comfortable weather in Helena, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | -2° | -13° | 33 mm | 92% |
| Feb | -1° | -12° | 35 mm | 87% |
| Mar | 4° | -7° | 41 mm | 77% |
| Apr | 9° | -3° | 58 mm | 71% |
| May | 15° | 2° | 73 mm | 67% |
| Jun | 20° | 6° | 83 mm | 65% |
| Jul | 27° | 11° | 34 mm | 55% |
| Aug | 25° | 10° | 37 mm | 54% |
| Sep | 19° | 4° | 41 mm | 59% |
| Oct | 10° | -2° | 41 mm | 70% |
| Nov | 3° | -7° | 36 mm | 80% |
| Dec | -3° | -12° | 36 mm | 89% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Helena. Values describe typical conditions, not a forecast.
About Helena weather
Helena, in Montana's continental climate, ranging from northern plains to Rocky Mountain terrain, is positioned about 152 km east of Missoula. The warmer months mean warm days and cool nights (June–August). Finally, there's long, cold winters with heavy mountain snowfall. This page shows live, auto-refreshing weather for Helena: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Denver.
Frequently asked questions
Helena is about 152 km east of Missoula, in Montana.
Helena sees long, cold winters with heavy mountain snowfall.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Helena's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Helena, with average daytime highs of about 27°C and nights around 11°C.
The coldest nights come in January, when the average low is about -13°C and daytime highs reach around -2°C. Frost is possible on clear, calm nights.
Helena receives about 550 mm of rain in a typical year. June is the wettest month at roughly 83 mm; no month averages more than 100 mm.
June to August usually offer the most comfortable weather in Helena, with mild daytime temperatures and little rain.
In November Helena typically sees daytime highs near 3°C and lows near -7°C, with about 36 mm of rain over the month and average humidity around 80%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Helena updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Helena's day-to-day weather follows the broader pattern of Montana described above. See the hourly weather forecast or the air quality index for more detail.