Helena West Side, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Helena West Side, a community in Lewis And Clark County, Montana.
Today
62°F
Showers And Thunderstorms
Showers and thunderstorms before 9am, then rain between 9am and noon, then showers and thunderstorms between noon and 3pm, then a chance of rain. Cloudy, with a high near 62. North wind 3 to 7 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Helena West Side
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 62°F | Showers And Thunderstorms | 3 to 7 mph N | 96% |
| Tonight | 47°F | Mostly Cloudy | 1 to 5 mph W | 14% |
| Sunday | 72°F | Mostly Sunny | 1 to 6 mph SSE | 0% |
| Sunday Night | 47°F | Mostly Clear | 5 mph S | 0% |
| Monday | 77°F | Sunny | 2 to 8 mph SSW | 0% |
| Monday Night | 48°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 77°F | Sunny | 2 to 6 mph NNE | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 5 mph SW | 2% |
| Wednesday | 78°F | Sunny | 2 to 7 mph SSE | 1% |
| Wednesday Night | 50°F | Mostly Clear | 5 mph SSE | 3% |
| Thursday | 79°F | Sunny | 3 to 7 mph SSE | 2% |
| Thursday Night | 52°F | Mostly Clear | 6 mph SSW | 5% |
| Friday | 77°F | Mostly Sunny | 3 to 8 mph S | 4% |
| Friday Night | 49°F | Slight Chance Light Rain then Mostly Cloudy | 8 mph W | 15% |
Forecast source: National Weather Service (api.weather.gov) for Helena West Side (46.596, -112.128). Updated through the day.
Growing snapshot for Helena West Side
Last spring frost
May 9
First fall frost
Sep 30
Growing season
142 days
Hardiness zone
4b
More local growing data for Helena West Side: nearby ZIP 59636 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Canyon Creek
Craig
East Helena
Helena
Helena Valley Northeast
Helena Valley Northwest
Helena Valley Southeast
Helena Valley West Central
Lincoln
Marysville
Milford Colony
Montana City
Rimini
South Hills
Spokane Creek
Unionville
Wolf Creek
York
Climate data from the nearest NOAA station, Helena Rgnl Ap, Mt (7.2 mi from Helena West Side). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.