Cyr, MT Weather & Growing Conditions
Overnight
29°F
Mostly Cloudy
Mostly cloudy, with a low around 29. Wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 29°F | Mostly Cloudy | 0 mph | 0% |
| Wednesday | 46°F | Mostly Sunny | 2 mph WNW | 0% |
| Wednesday Night | 29°F | Partly Cloudy | 1 to 5 mph SSW | 4% |
| Thursday | 40°F | Slight Chance Rain And Snow | 5 mph SW | 22% |
| Thursday Night | 31°F | Partly Cloudy | 5 mph SW | 3% |
| Friday | 44°F | Partly Sunny | 3 to 7 mph SSW | 9% |
| Friday Night | 37°F | Mostly Cloudy | 3 to 8 mph SW | 9% |
| Saturday | 51°F | Partly Sunny | 2 to 6 mph SSW | 5% |
| Saturday Night | 39°F | Mostly Cloudy then Chance Light Rain | 2 to 9 mph S | 35% |
| Sunday | 50°F | Chance Rain And Snow | 5 to 10 mph SW | 35% |
| Sunday Night | 36°F | Slight Chance Rain And Snow | 2 to 6 mph SW | 21% |
| Monday | 47°F | Partly Sunny then Slight Chance Light Rain | 2 mph SE | 15% |
| Monday Night | 39°F | Slight Chance Light Rain | 1 to 5 mph SW | 17% |
| Tuesday | 49°F | Slight Chance Light Rain | 5 mph SW | 18% |
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 Nov 4, 2026.