Spearfish (SD) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Spearfish.
Climate overview of Spearfish
Spearfish, South Dakota, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 30°C (86°F) in July, while winters cool to 3°C (37°F) in December.
Annual rain/snowfall is moderate at around 654 mm (26 in), with May being the wettest month. The city also has a distinct dry season from November to February, with warm summers and cold winters.
Spearfish Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Spearfish - and find the best time to visit.
Monthly Temperature in Spearfish
Depending on the time of the year, temperatures range from comfortable to chilly in Spearfish. Average daytime temperatures reach a comfortable 30°C (86°F) in July. In December, the coolest month of the year, temperatures drop to a chilly 3°C (37°F).
At night, temperatures range from around 15°C (59°F) in July to -9°C (16°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Spearfish
Generally, Spearfish has a moderate amount of precipitation, averaging 654 mm (26 in) of rain/snowfall annually. Spearfish can be quite wet during May, receiving approximately 120 mm (4.7 in) of precipitation over 16 rainy days.
In contrast, during the driest month (January), you will experience much drier conditions, with 21 mm (0.8 in) of precipitation spread across 10 snowy days. For more details, please visit our Spearfish 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 Spearfish
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: August and September
- Warmest weather: July and August
- Fewer rainy days: January, March, September, November and December
- Wettest months: April, May and June, when rainfall is highest.
- Seasonal pattern: A distinct dry season from November to February, with warm summers and cold winters
- Coldest conditions: December, with freezing nights around -9°C (16°F).
Frequently asked questions about the climate in Spearfish
What is the best time to visit Spearfish?
August and September typically offer the most optimal weather in Spearfish. In contrast, January, February, March and December tend to have less optimal conditions. Spearfish has a distinct dry season from November to February, with warm summers and cold winters.
What temperatures can I expect in Spearfish?
Daytime highs range from 3°C (37°F) in December to 30°C (86°F) in July. Nighttime lows range from -9°C (16°F) to 15°C (59°F). Temperatures vary considerably through the year.
How much rain does Spearfish get?
Annual rainfall is around 654 mm (26 in). May is the wettest month with 120 mm (4.7 in), while January is the driest with 21 mm (0.8 in).
Spearfish 3-Day Forecast
Spearfish on the map
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