Average Temperatures and Rainfall for South Dakota

Average annual temperatures for South Dakota (8°C/46°F) are slightly below the average for United States (13°C/55°F).

Average annual rainfall for South Dakota (498mm/20 inches) is significantly below the average for United States (1,039mm/41 inches).

What is the warmest or hottest month in South Dakota?

July is the hottest or warmest month in South Dakota, with an average maximum temperate of 30°C/86°F.

What is the coldest or coolest month in South Dakota?

February is the coolest or coldest month in South Dakota, with an average minimum temperate of -13°C/9°F.

What is the most rainy or wettest month in South Dakota?

May is the wettest or most rainy month in South Dakota, with an average rainfall of 74mm/3 inches.

What is the least rainy or driest month in South Dakota?

January is the driest or least rainy month in South Dakota, with an average rainfall of 12mm/0 inches.

What is the warmest or hottest place in South Dakota?

Sioux Falls is the hottest or warmest place in South Dakota, with an average maximum temperate of 9°C/48°F.

What is the coldest place in South Dakota?

Rapid City is the coldest place in South Dakota, with an average maximum temperate of 6°C/43°F.

What is the most rainy or wettest place in South Dakota?

Sioux Falls is the most rainy or wettest place in South Dakota, with an average annual rainfall of 781mm/31 inches.

What is the least rainy or driest place in South Dakota?

Sioux Falls is the least rainy or driest place in South Dakota, with an average annual rainfall of 781mm/31 inches.

Average Monthly Temperatures
Average Maximum Temperature Average Minimum Temperature
Average Monthly Rainfall
PlaceMin TempMax TempAvg TempRainfall
Rapid City -2 14 6 -
Sioux Falls 3 15 9 781