Sidney, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sidney, a city in Richland County, Montana.
This Afternoon
51°F
Sunny
Sunny. High near 51, with temperatures falling to around 44 in the afternoon. West northwest wind 1 to 5 mph.
7-day forecast for Sidney
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 51°F | Sunny | 1 to 5 mph WNW | 0% |
| 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% |
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 3, 2026.