Sidney, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sidney, a city in Richland County, Montana.
Tonight
24°F
Partly Cloudy
Partly cloudy, with a low around 24. Southwest wind around 1 mph.
7-day forecast for Sidney
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 24°F | Partly Cloudy | 1 mph SW | 0% |
| Wednesday | 54°F | Mostly Sunny | 0 to 6 mph W | 0% |
| Wednesday Night | 24°F | Mostly Cloudy | 2 mph WSW | 0% |
| Thursday | 53°F | Mostly Sunny | 0 to 6 mph SSE | 0% |
| Thursday Night | 28°F | Partly Cloudy | 5 mph SSW | 0% |
| Friday | 56°F | Mostly Sunny | 3 to 9 mph WSW | 0% |
| Friday Night | 33°F | Partly Cloudy | 5 to 10 mph WSW | 4% |
| Saturday | 57°F | Sunny | 7 to 15 mph W | 4% |
| Saturday Night | 29°F | Mostly Clear | 3 to 7 mph SW | 0% |
| Sunday | 63°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
| Sunday Night | 38°F | Partly Cloudy | 10 mph WSW | 1% |
| Monday | 57°F | Mostly Sunny | 5 to 12 mph W | 1% |
| Monday Night | 31°F | Partly Cloudy | 5 mph WSW | 1% |
| Tuesday | 59°F | Partly Sunny | 3 to 9 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Sidney (47.715, -104.167). Updated through the day.
Growing snapshot for Sidney
Last spring frost
May 11
First fall frost
Sep 27
Growing season
137 days
Hardiness zone
4a
More local growing data for Sidney: nearby ZIP 59270 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Sidney, Mt (8.7 mi from Sidney). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.