Sidney, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sidney, a city in Richland County, Montana.
This Afternoon
80°F
Mostly Sunny
Mostly sunny, with a high near 80. East southeast wind around 6 mph.
7-day forecast for Sidney
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Mostly Sunny | 6 mph ESE | 3% |
| Tonight | 56°F | Chance Showers And Thunderstorms | 7 mph NE | 37% |
| Saturday | 67°F | Rain Showers Likely | 6 to 13 mph NE | 55% |
| Saturday Night | 51°F | Rain Showers Likely | 12 mph ENE | 62% |
| Sunday | 64°F | Rain Showers Likely | 12 mph E | 63% |
| Sunday Night | 48°F | Mostly Cloudy | 5 to 10 mph ESE | 5% |
| Monday | 71°F | Mostly Sunny | 5 to 14 mph SE | 3% |
| Monday Night | 50°F | Partly Cloudy | 9 to 14 mph SE | 0% |
| Tuesday | 77°F | Mostly Sunny | 9 to 15 mph SSE | 0% |
| Tuesday Night | 53°F | Mostly Clear | 6 to 14 mph SSE | 3% |
| Wednesday | 80°F | Sunny | 8 mph SSE | 9% |
| Wednesday Night | 53°F | Slight Chance Rain Showers then Mostly Clear | 5 mph SSE | 15% |
| Thursday | 82°F | Sunny | 3 to 8 mph SSE | 3% |
| Thursday Night | 55°F | Mostly Clear | 8 mph SE | 3% |
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 Sep 19, 2026.