Cyr, MT Weather & Growing Conditions
This Afternoon
64°F
Mostly Sunny
Mostly sunny, with a high near 64. East northeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Mostly Sunny | 5 mph ENE | 9% |
| Tonight | 47°F | Partly Cloudy | 3 mph ESE | 6% |
| Sunday | 69°F | Sunny | 3 mph NNE | 1% |
| Sunday Night | 48°F | Mostly Clear | 2 mph SSE | 0% |
| Monday | 72°F | Sunny | 2 mph S | 0% |
| Monday Night | 50°F | Mostly Clear | 3 mph SW | 0% |
| Tuesday | 71°F | Sunny | 3 mph S | 0% |
| Tuesday Night | 52°F | Partly Cloudy | 3 mph SW | 1% |
| Wednesday | 68°F | Mostly Sunny | 2 to 7 mph SW | 3% |
| Wednesday Night | 49°F | Partly Cloudy | 5 mph WSW | 7% |
| Thursday | 68°F | Mostly Sunny | 5 mph SSW | 2% |
| Thursday Night | 49°F | Partly Cloudy | 2 mph W | 8% |
| Friday | 65°F | Mostly Sunny | 2 to 6 mph S | 9% |
| Friday Night | 46°F | Mostly Cloudy then Slight Chance Light Rain | 5 mph WSW | 16% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Cyr, MT
Last spring frost
May 18
First fall frost
Sep 25
Growing season
126 days
Hardiness zone
5b
Explore more for Cyr, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Alberton, Mt (9.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.