Ismay, MT Weather & Growing Conditions
Tonight
57°F
Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 8pm and 11pm, then a chance of showers and thunderstorms between 11pm and midnight, then a chance of showers and thunderstorms between midnight and 3am, then patchy fog and a chance of showers and thunderstorms. Mostly cloudy. Low around 57, with temperatures rising to around 59 overnight. East wind around 7 mph. Chance of precipitation is 50%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Chance Showers And Thunderstorms | 7 mph E | 50% |
| Saturday | 64°F | Showers And Thunderstorms | 6 to 13 mph E | 94% |
| Saturday Night | 53°F | Showers And Thunderstorms | 12 mph E | 85% |
| Sunday | 61°F | Rain Showers | 13 mph ESE | 91% |
| Sunday Night | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 7 to 12 mph ESE | 18% |
| Monday | 67°F | Partly Sunny | 7 to 12 mph SE | 6% |
| Monday Night | 51°F | Partly Cloudy | 13 mph SE | 1% |
| Tuesday | 76°F | Sunny | 12 mph SSE | 0% |
| Tuesday Night | 54°F | Mostly Clear | 6 to 10 mph SSE | 3% |
| Wednesday | 79°F | Mostly Sunny | 7 mph SSE | 13% |
| Wednesday Night | 55°F | Mostly Clear | 6 mph SSE | 8% |
| Thursday | 80°F | Sunny | 7 mph SSE | 4% |
| Thursday Night | 56°F | Mostly Clear | 6 to 9 mph SE | 4% |
| Friday | 80°F | Mostly Sunny | 12 mph SE | 2% |
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 Sep 19, 2026.