Helena Valley Southeast, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Helena Valley Southeast, a community in Lewis And Clark County, Montana.
This Afternoon
62°F
Chance Light Rain
A chance of rain before 5pm. Cloudy, with a high near 62. North wind around 5 mph. Chance of precipitation is 50%.
7-day forecast for Helena Valley Southeast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 62°F | Chance Light Rain | 5 mph N | 52% |
| Tonight | 45°F | Mostly Cloudy then Patchy Fog | 3 mph SSW | 7% |
| Sunday | 72°F | Patchy Fog then Sunny | 1 to 5 mph ESE | 2% |
| Sunday Night | 44°F | Mostly Clear | 5 mph SSE | 0% |
| Monday | 76°F | Sunny | 1 to 7 mph SE | 0% |
| Monday Night | 46°F | Mostly Clear | 2 to 6 mph S | 0% |
| Tuesday | 78°F | Sunny | 1 to 5 mph SE | 0% |
| Tuesday Night | 48°F | Partly Cloudy | 2 mph SSW | 4% |
| Wednesday | 78°F | Mostly Sunny | 1 to 6 mph SSE | 1% |
| Wednesday Night | 48°F | Partly Cloudy | 5 mph SSW | 3% |
| Thursday | 79°F | Sunny | 2 to 9 mph SSE | 2% |
| Thursday Night | 48°F | Mostly Clear | 5 mph S | 5% |
| Friday | 78°F | Mostly Sunny | 3 to 8 mph SSE | 6% |
| Friday Night | 47°F | Partly Cloudy | 9 mph SW | 12% |
Forecast source: National Weather Service (api.weather.gov) for Helena Valley Southeast (46.623, -111.901). Updated through the day.
Growing snapshot for Helena Valley Southeast
Last spring frost
May 9
First fall frost
Sep 30
Growing season
142 days
Hardiness zone
4b
More local growing data for Helena Valley Southeast: nearby ZIP 59602 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 West Central
Helena West Side
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 (8.8 mi from Helena Valley Southeast). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.