Ismay, MT Weather & Growing Conditions
Today
73°F
Sunny
Sunny, with a high near 73. West northwest wind 7 to 13 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Sunny | 7 to 13 mph WNW | 0% |
| Tonight | 50°F | Mostly Clear | 2 to 10 mph SSE | 1% |
| Wednesday | 82°F | Partly Sunny | 7 mph SW | 0% |
| Wednesday Night | 55°F | Partly Cloudy | 6 mph SSE | 0% |
| Thursday | 91°F | Sunny | 6 mph W | 0% |
| Thursday Night | 59°F | Mostly Clear | 7 mph NE | 0% |
| Friday | 94°F | Sunny | 5 to 8 mph SE | 0% |
| Friday Night | 62°F | Partly Cloudy | 9 mph NE | 1% |
| Saturday | 93°F | Sunny | 6 to 9 mph N | 0% |
| Saturday Night | 64°F | Mostly Clear | 7 to 10 mph NE | 2% |
| Sunday | 93°F | Mostly Sunny | 8 to 12 mph ENE | 5% |
| Sunday Night | 64°F | Partly Cloudy then Slight Chance Rain Showers | 12 mph ENE | 20% |
| Monday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 12 mph ENE | 17% |
| Monday Night | 63°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 13 mph E | 37% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Ismay, MT
Last spring frost
May 22
First fall frost
Sep 15
Growing season
117 days
Hardiness zone
4a
Explore more for Ismay, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Mizpah 4 Nnw, Mt (16.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.