Sioux Falls Weather in August
August in Sioux Falls averages 28°C (82°F) during the day and 16°C (61°F) at night. Quite a bit of rainfall is typical this month, with around 94 mm (3.7 in) on average. An umbrella is a good idea.
Rainfall in Sioux Falls in August
Rain is expected on roughly 10 days, totalling around 94 mm (3.7 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Sioux Falls in August
If you're visiting Sioux Falls in August, expect perfect temperatures with highs of 28°C (82°F) and overnight lows of 16°C (61°F). The summer season is characteristic of August. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 16°C (61°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, July, August and September typically offer the best weather for Sioux Falls.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Sioux Falls's climate page.
Sioux Falls Temperature in August
Min Temperature
16°C (61°F)
Max Temperature
28°C (82°F)
Chance of Rain
34%
Precipitation
94 mm (3.7 in)
Rainy days
10 days
Humidity
68%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Sioux Falls typically stay consistent throughout August, with daily highs averaging around 28°C (82°F). Nights are pleasant, with lows typically ranging from 15°C (59°F) to 18°C (64°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Sioux Falls in August
Browse day-by-day weather records for Sioux Falls spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sioux Falls historical weather extremes in August
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Sioux Falls.
- The hottest August day on record in Sioux Falls reached 40°C (104°F) (August 15, 1988).
- Sioux Falls experienced its chilliest August day on August 25, 1987, reaching only 14°C (57°F).
- Nighttime temperatures dropped to 4°C (39°F) on August 19, 2004, marking the coldest August night on record.
Best Places in the United States of America in August
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in August →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Sioux Falls in August
Warm but pleasant conditions in Sioux Falls in August. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags.What To Do in Sioux Falls in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Sioux Falls's climate page.
See the full Sioux Falls climate overview or explore weather in the United States of America.
