Sidney, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sidney, a city in Richland County, Montana.
Today
75°F
Sunny
Sunny, with a high near 75. West northwest wind around 15 mph, with gusts as high as 26 mph.
7-day forecast for Sidney
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Sunny | 15 mph WNW | 0% |
| Tonight | 49°F | Mostly Clear | 2 to 12 mph WSW | 1% |
| Wednesday | 85°F | Partly Sunny | 7 to 14 mph WSW | 0% |
| Wednesday Night | 53°F | Partly Cloudy | 2 to 12 mph WSW | 0% |
| Thursday | 91°F | Sunny | 3 to 9 mph W | 0% |
| Thursday Night | 56°F | Mostly Clear | 5 to 9 mph N | 0% |
| Friday | 89°F | Sunny | 5 to 8 mph ENE | 0% |
| Friday Night | 56°F | Mostly Clear | 5 to 9 mph NE | 1% |
| Saturday | 91°F | Sunny | 5 to 10 mph NE | 0% |
| Saturday Night | 58°F | Mostly Clear | 6 to 12 mph NE | 2% |
| Sunday | 90°F | Partly Sunny | 6 to 14 mph ENE | 4% |
| Sunday Night | 58°F | Partly Cloudy | 8 to 14 mph NE | 14% |
| Monday | 86°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 8 to 14 mph ENE | 19% |
| Monday Night | 57°F | Slight Chance Showers And Thunderstorms | 9 to 14 mph ENE | 23% |
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 Aug 4, 2026.