South Dakota

South Dakota Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in South Dakota, the United States of America in September.

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Sioux Falls Pierre Rapid City Deadwood

Considering a trip to South Dakota, the United States of America this September and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:

What to Expect in South Dakota in September

South Dakota, the United States of America is a region in the United States of America. September in South Dakota generally has temperatures that range from pleasant to warm, with precipitation levels ranging from low to moderate.

Temperatures

Based on our climate data spanning from 1990-2020, the average maximum temperature is pleasant in Lead at 21°C (70°F) to warm in Hot Springs at 26°C (79°F). Nighttime temperatures generally drop to 8°C (46°F) in Hot Springs and 8°C (46°F) in Lead.

For specific regional insights in South Dakota, the United States of America, refer to the map provided below.

Precipitation

In September, precipitation varies across different areas. From low rainfall in Wall with an average of 29 mm (1.1 in) to moderate rainfall in Vermillion with 78 mm (3.1 in).

Explore South Dakota by month

Pick a month to see the average temperature, rainfall and sunshine in South Dakota — and find the best time to visit. (based on Sioux Falls)

January-3°C (27°F) February-2°C (28°F) March7°C (45°F) April14°C (57°F) May21°C (70°F) June26°C (79°F) This monthJuly29°C (84°F) August28°C (82°F) September24°C (75°F) October16°C (61°F) November8°C (46°F) December-2°C (28°F)
Best Time to Visit South Dakota →

Best Places to Visit in South Dakota in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across South Dakota.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in South Dakota

What is the weather like in September for some of the most popular destinations in South Dakota, the United States of America?

Temperature range in South Dakota (September)

Precipitation variation in South Dakota (September)

Sioux Falls

In September Sioux Falls generally has high temperatures with maximum daytime temperatures around 24°C (75°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
28°C (82°F)
24°C (75°F)
16°C (61°F)
Min temperature
16°C (61°F)
10°C (50°F)
3°C (37°F)
Monthly rainfall
94 mm (3.7 in)
71 mm (2.8 in)
62 mm (2.4 in)
Monthly rainy days
10 days
9 days
8 days
Weather conditions
perfect
perfect
tolerable
Climate in Sioux Falls →

Pierre

In September Pierre generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
30°C (86°F)
25°C (77°F)
16°C (61°F)
Min temperature
15°C (59°F)
10°C (50°F)
2°C (36°F)
Monthly rainfall
67 mm (2.6 in)
40 mm (1.6 in)
56 mm (2.2 in)
Monthly rainy days
9 days
7 days
8 days
Weather conditions
pleasant
perfect
tolerable
Climate in Pierre →

Rapid City

In September Rapid City generally has high temperatures with maximum daytime temperatures around 24°C (75°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
29°C (84°F)
24°C (75°F)
15°C (59°F)
Min temperature
15°C (59°F)
10°C (50°F)
3°C (37°F)
Monthly rainfall
62 mm (2.4 in)
36 mm (1.4 in)
40 mm (1.6 in)
Monthly rainy days
10 days
6 days
8 days
Weather conditions
perfect
perfect
tolerable
Climate in Rapid City →

Deadwood

In September Deadwood generally has pleasant temperatures with maximum daytime temperatures around 22°C (72°F), minimum nighttime temperatures around 8°C (46°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
26°C (79°F)
22°C (72°F)
14°C (57°F)
Min temperature
13°C (55°F)
8°C (46°F)
2°C (36°F)
Monthly rainfall
69 mm (2.7 in)
47 mm (1.9 in)
85 mm (3.3 in)
Monthly rainy days
11 days
8 days
11 days
Weather conditions
perfect
perfect
tolerable
Climate in Deadwood →

Custer

In September Custer generally has pleasant temperatures with maximum daytime temperatures around 22°C (72°F), minimum nighttime temperatures around 7°C (45°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
26°C (79°F)
22°C (72°F)
13°C (55°F)
Min temperature
11°C (52°F)
7°C (45°F)
0°C (32°F)
Monthly rainfall
62 mm (2.4 in)
41 mm (1.6 in)
37 mm (1.5 in)
Monthly rainy days
14 days
8 days
8 days
Weather conditions
perfect
perfect
unpleasant
Climate in Custer →

Is your destination not in the list? Have a look at all destinations in South Dakota, in the United States of America.

Popular cities in September

Day & night temperatures, rainfall and average weather in South Dakota in September.

City Weather Day temp Night temp Rainfall
Sioux Falls 24°C (75°F) 10°C (50°F) 71 mm (2.8 in)
Pierre 25°C (77°F) 10°C (50°F) 40 mm (1.6 in)
Rapid City 24°C (75°F) 10°C (50°F) 36 mm (1.4 in)
Deadwood 22°C (72°F) 8°C (46°F) 47 mm (1.9 in)
Custer 22°C (72°F) 7°C (45°F) 41 mm (1.6 in)
Hot Springs 26°C (79°F) 8°C (46°F) 36 mm (1.4 in)

South Dakota weather in September: frequently asked questions

What is the weather like in South Dakota, the United States of America in September?

September in South Dakota, the United States of America brings perfect weather. In Sioux Falls, daytime temperatures are typically around 24°C (75°F) and nighttime lows hover near 10°C (50°F).

What is the average temperature in South Dakota, the United States of America in September?

Sioux Falls averages a daytime maximum of 24°C (75°F) in September, with overnight lows close to 10°C (50°F).

Does South Dakota, the United States of America get a lot of rain in September?

Not particularly. Sioux Falls averages just 71 mm (2.8 in) of rain in September, making it a mostly dry month for South Dakota, the United States of America.

Is September a Good Time to Visit South Dakota, the United States of America?

We consider September to be one of the best times to travel to South Dakota, the United States of America. Typically, the climate in Sioux Falls is perfect.

Generally speaking, the best visiting conditions can be found in May, July, August and September offering mostly perfect weather in Sioux Falls. The weather in January, February, March and December, on the other hand, tends to be poor.

Interested in more climate information?

We have much more information about the climate in South Dakota.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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