Sidney (MT) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Sidney.
Climate overview of Sidney
Sidney, Montana, United States of America, sees big temperature differences between seasons, with July peaking at 30°C (86°F) and December dropping to -3°C (27°F).
Rain/snowfall is modest, totalling around 413 mm (16 in) annually. The city experiences a distinct dry season from September to April, with very warm summers and very cold winters. May tends to be the wettest month.
Sidney Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sidney - and find the best time to visit.
Monthly Temperature in Sidney
Visitors to Sidney can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a very warm 30°C (86°F) in July, the warmest time of the year, to a very cold -3°C (27°F) during cooler months like December.
At night, you can expect temperatures ranging from 14°C (57°F) in July to around -14°C (7°F) during December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Sidney
Sidney typically sees modest rain/snowfall throughout the year, with an average annual precipitation of 413 mm (16 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, May it receives moderate rainfall, averaging 82 mm (3.2 in) of precipitation, recorded across 12 rainy days. In contrast, the driest month February brings less snowfall, with 8.9 mm (0.4 in) over 5 snowy days. For more details, please visit our Sidney Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Sidney
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June, August and September
- Warmest weather: July and August
- Fewer rainy days: January, February, March, November and December
- Seasonal pattern: A distinct dry season from September to April, with very warm summers and very cold winters
- Coldest conditions: December, with freezing nights around -14°C (7°F).
Frequently asked questions about the climate in Sidney
What is the best time to visit Sidney?
May, June, August and September typically offer the most optimal weather in Sidney. In contrast, January, February and December tend to have less optimal conditions. Sidney has a distinct dry season from September to April, with very warm summers and very cold winters.
What temperatures can I expect in Sidney?
Daytime highs range from -3°C (27°F) in December to 30°C (86°F) in July. Nighttime lows range from -14°C (7°F) to 14°C (57°F). Temperatures vary considerably through the year.
How much rain does Sidney get?
Annual rainfall is around 413 mm (16 in). May is the wettest month with 82 mm (3.2 in), while February is the driest with 8.9 mm (0.4 in).
Sidney 3-Day Forecast
Sidney (MT) 3-Day Forecast
Sidney on the map
Sidney is highlighted - select any city to see its climate.
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