South Dakota weather in September: Statewide normals and every place, NOAA 1991-2020
In September, South Dakota's statewide normal high is 75°F and normal low 48°F; normal highs run from 69°F in Custer to 82°F in Interior (NOAA 1991-2020 normals).
- Statewide normal high
- 75°FSeptember, 1991-2020
- Statewide normal low
- 48°FSeptember, 1991-2020
- Statewide normal precipitation
- 1.91 inSeptember
- Warmest place
- 82°Fnormal high, Interior
- Coolest place
- 69°Fnormal high, Custer
Where is South Dakota warmest and wettest in September?
Interior has the warmest September afternoons (82°F) and Custer the coolest (69°F). Wentworth gets the most precipitation (3.27 in) and Newell the least (0.99 in). The most snow falls in Lead (1.8 inches).
Statewide, September averaged 65.0°F in 2021, 65.4°F in 2022, 64.8°F in 2023, 68.2°F in 2024, 64.7°F in 2025, against a 1991-2020 normal of 61.5°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Sioux Falls | 76°F | 52°F | 2.73 | 0.0 |
| Rapid City | 76°F | 46°F | 1.22 | 0.1 |
| Aberdeen | 75°F | 47°F | 1.99 | 0.0 |
| Brookings | 72°F | 48°F | 3.10 | 0.0 |
| Watertown | 72°F | 49°F | 2.45 | 0.0 |
| Yankton | 78°F | 52°F | 2.85 | 0.0 |
| Mitchell | 77°F | 51°F | 2.34 | – |
| Huron | 76°F | 50°F | 2.43 | 0.0 |
| Spearfish | 74°F | 48°F | 1.56 | 0.1 |
| Pierre | 78°F | 50°F | 1.74 | 0.0 |
| Vermillion | 78°F | 52°F | 3.07 | – |
| Madison | 73°F | 50°F | 3.21 | 0.0 |
| Belle Fourche | 78°F | 47°F | 1.34 | 0.0 |
| Hot Springs | 80°F | 45°F | 1.40 | 0.1 |
| Milbank | 72°F | 48°F | 2.60 | – |
| Mobridge | 77°F | 50°F | 1.52 | 0.0 |
| Lead | 72°F | 47°F | 1.96 | 1.8 |
| Canton | 74°F | 50°F | 2.90 | 0.0 |
| Winner | 79°F | 53°F | 1.81 | – |
| Pine Ridge | 79°F | 47°F | 1.45 | – |
| Chamberlain | 77°F | 51°F | 2.13 | – |
| Sisseton | 74°F | 48°F | 2.45 | 0.0 |
| Flandreau | 72°F | 48°F | 3.07 | 0.0 |
| Redfield | 74°F | 48°F | 2.00 | – |
| Custer | 69°F | 43°F | 1.59 | – |
| Webster | 71°F | 50°F | 2.56 | 0.0 |
| Oglala | 78°F | 49°F | – | – |
| Kyle | 79°F | 46°F | 1.51 | – |
| Wagner | 78°F | 53°F | 2.95 | – |
| Deadwood | 73°F | 44°F | – | – |
| Salem | 74°F | 48°F | 3.03 | – |
| Miller | 74°F | 49°F | 1.95 | 0.0 |
| Gregory | 77°F | 50°F | 2.41 | 0.0 |
| Clear Lake | 70°F | 49°F | 3.01 | 0.0 |
| Britton | 73°F | 47°F | 2.56 | 0.0 |
| Clark | 72°F | 49°F | 2.54 | – |
| Lemmon | 77°F | 47°F | 1.48 | 0.0 |
| Mission | 77°F | 48°F | 1.75 | 0.0 |
| Tyndall | 76°F | 51°F | 2.70 | 0.0 |
| Gettysburg | 74°F | 48°F | 2.01 | 0.0 |
| De Smet | 72°F | 50°F | 2.78 | 0.0 |
| Centerville | 75°F | 50°F | 3.12 | 0.0 |
| Hill City | 74°F | 39°F | 1.54 | 1.0 |
| Ipswich | 74°F | 47°F | 1.94 | 0.0 |
| Arlington | 73°F | 50°F | 2.55 | – |
| Martin | 77°F | 48°F | 1.19 | 0.1 |
| Howard | 77°F | 48°F | 2.96 | 0.0 |
| Faulkton | 74°F | 47°F | 2.04 | 0.0 |
| Wessington Springs | 74°F | 51°F | 2.73 | 0.0 |
| Edgemont | 78°F | 42°F | 1.21 | 0.1 |
| Eureka | 72°F | 46°F | 1.79 | 0.0 |
| Philip | 79°F | 48°F | 1.23 | – |
| Castlewood | 72°F | 47°F | 2.69 | – |
| Armour | 79°F | 52°F | 2.42 | 0.0 |
| Johnson Siding | 73°F | 43°F | 1.37 | – |
| Alexandria | 75°F | 49°F | 2.81 | 0.0 |
| Highmore | 77°F | 50°F | 2.02 | 0.0 |
| Onida | 77°F | 49°F | 1.78 | 0.0 |
| Menno | 77°F | 52°F | 2.86 | 0.0 |
| Selby | 74°F | 48°F | 1.64 | 0.0 |
| Newell | 75°F | 47°F | 0.99 | 0.0 |
| Timber Lake | 76°F | 48°F | 1.53 | 0.0 |
| Bridgewater | 75°F | 51°F | 3.03 | – |
| Dupree | 80°F | 49°F | 1.22 | 0.0 |
| Waubay | 73°F | 52°F | 2.39 | 0.0 |
| Presho | 78°F | 48°F | – | – |
| Murdo | 77°F | 51°F | 1.48 | 0.0 |
| Montrose | 75°F | 49°F | – | – |
| Wilmot | 73°F | 48°F | 2.34 | 0.0 |
| Leola | 73°F | 46°F | 1.82 | – |
| White Lake | 75°F | 50°F | 2.58 | 0.0 |
| Faith | 76°F | 48°F | 1.18 | – |
| Buffalo | 75°F | 46°F | 1.13 | – |
| Bison | 76°F | 48°F | 1.38 | 0.0 |
| Kennebec | 80°F | 50°F | 1.72 | 0.0 |
| Roscoe | 73°F | 47°F | 1.91 | 0.0 |
| Summit | 73°F | 48°F | 2.77 | 0.0 |
| Bonesteel | 76°F | 51°F | 2.91 | 0.0 |
| Pickstown | 78°F | 53°F | 2.43 | 0.0 |
| Pollock | 75°F | 48°F | 1.54 | 0.0 |
| Mellette | 74°F | 45°F | 2.35 | 0.0 |
| Wentworth | 74°F | 51°F | 3.27 | 0.0 |
| Columbia | 73°F | 47°F | 2.38 | 0.0 |
| Conde | 74°F | 48°F | 2.57 | 0.0 |
| Astoria | 70°F | 49°F | – | – |
| Oelrichs | 79°F | 46°F | 1.40 | 0.2 |
| Midland | 79°F | 48°F | – | – |
| Andover | 73°F | 50°F | 2.47 | – |
| Camp Crook | 78°F | 45°F | 1.19 | 0.1 |
| Interior | 82°F | 51°F | 1.39 | 0.0 |
| Wasta | 79°F | 47°F | 1.19 | 0.0 |
| Turton | 75°F | 49°F | 2.38 | – |
| Wood | 78°F | 48°F | 1.82 | 0.0 |
| Forestburg | 77°F | 48°F | 2.26 | 0.0 |
| Winfred | 73°F | 49°F | 2.87 | – |
| Oral | 79°F | 43°F | 1.45 | 0.0 |
| Cottonwood | 78°F | 45°F | 1.22 | 0.0 |
| Stephan | 76°F | 47°F | 1.95 | 0.0 |
| Gann Valley | 77°F | 48°F | 2.82 | 0.0 |
| Aberdeen (35 mi WNW) | 71°F | 47°F | 2.00 | – |
| Academy (2 mi NE) | 77°F | 51°F | 2.54 | 0.0 |
| Antelope Ranger Station | 75°F | 42°F | – | – |
| Ardmore | 80°F | 44°F | 1.40 | 0.4 |
| Bear Ridge | 76°F | 44°F | 1.57 | 0.6 |
| Cedar Butte | 80°F | 50°F | 1.63 | 0.0 |
| Elm Springs (3 mi ESE) | 78°F | 47°F | 1.26 | 0.0 |
| Fort Meade | 77°F | 49°F | 1.40 | 0.0 |
| Fort Pierre (17 mi WSW) | 79°F | 49°F | 1.50 | 0.0 |
| Glad Valley (2 mi W) | 74°F | 46°F | 1.62 | 0.3 |
| Harrington | 78°F | 49°F | 1.58 | 0.1 |
| Harrold (12 mi SSW) | 78°F | 46°F | 1.80 | 0.0 |
| Hereford (12 mi SW) | 76°F | 47°F | 1.30 | 0.1 |
| Hoover | 77°F | 42°F | 1.11 | 0.0 |
| Kirley (6 mi N) | 78°F | 49°F | 1.32 | 0.0 |
| Ladner (9 mi SW) | 72°F | 45°F | 1.42 | 0.0 |
| Lake Sharpe Project | 78°F | 50°F | 2.01 | 0.0 |
| Lodgepole (5 mi SW) | 73°F | 40°F | 1.49 | – |
| Longvalley | 79°F | 49°F | 1.50 | – |
| Ludlow (3 mi SSE) | 73°F | 45°F | 1.39 | – |
| Manderson (3 mi NE) | 79°F | 49°F | – | – |
| Maurine (12 mi SW) | 78°F | 45°F | 1.12 | 0.0 |
| McIntosh (6 mi SE) | 75°F | 48°F | 1.45 | 0.0 |
| McLaughlin | 74°F | 45°F | 1.45 | 0.0 |
| Milesville (5 mi NE) | 78°F | 49°F | 1.45 | 0.0 |
| Mission Ridge (5 mi NW) | 77°F | 50°F | 1.60 | – |
| Mount Rushmore National Memorial | 69°F | 50°F | 1.76 | 0.9 |
| Oahe Dam | 78°F | 49°F | 1.61 | – |
| Pactola Dam | 69°F | 40°F | 1.59 | 0.8 |
| Pierre (24 mi S) | 76°F | 50°F | 1.51 | – |
| Plainview (6 mi SSW) | 77°F | 45°F | 1.15 | 0.0 |
| Porcupine (11 mi N) | 78°F | 45°F | 1.48 | – |
| Ralph (1 mi N) | 76°F | 44°F | 1.18 | – |
| Rauville (2 mi W) | 72°F | 46°F | 2.74 | 0.0 |
| Red Owl | 75°F | 44°F | 1.29 | 0.0 |
| Redig (11 mi NE) | 77°F | 45°F | 1.01 | 0.0 |
| Rochford (2 mi WNW) | 71°F | 32°F | – | – |
| Roy Lake | 72°F | 51°F | 2.50 | 0.0 |
| Shadehill Reservoir | 76°F | 44°F | – | – |
| Victor (4 mi N) | 72°F | 47°F | 2.72 | 0.0 |
| Wind Cave | 76°F | 46°F | 1.53 | 0.2 |
| Zeona (10 mi SSW) | 77°F | 45°F | – | – |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.