Helena West Side, MT Weather & Growing Conditions
Tonight
53°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. Low around 53, with temperatures rising to around 56 overnight. West northwest wind 3 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Showers And Thunderstorms | 3 to 13 mph WNW | 96% |
| Saturday | 60°F | Rain then Showers And Thunderstorms Likely | 5 to 8 mph N | 96% |
| Saturday Night | 48°F | Chance Light Rain | 1 to 5 mph W | 30% |
| Sunday | 74°F | Mostly Sunny | 1 to 5 mph E | 1% |
| Sunday Night | 49°F | Mostly Clear | 5 mph S | 0% |
| Monday | 78°F | Sunny | 2 to 7 mph SSW | 0% |
| Monday Night | 50°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 78°F | Sunny | 2 to 6 mph SSW | 1% |
| Tuesday Night | 51°F | Mostly Clear | 5 mph WSW | 1% |
| Wednesday | 78°F | Sunny | 2 to 7 mph SW | 1% |
| Wednesday Night | 51°F | Mostly Clear | 5 mph W | 3% |
| Thursday | 80°F | Sunny | 2 to 6 mph S | 1% |
| Thursday Night | 52°F | Partly Cloudy | 6 mph SSW | 2% |
| Friday | 80°F | Mostly Sunny | 2 to 7 mph SSW | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Helena West Side, MT
Last spring frost
May 9
First fall frost
Sep 30
Growing season
142 days
Hardiness zone
4b
Explore more for Helena West Side, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Helena Rgnl Ap, Mt (7.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.