Brookings weather in September: Brookings, South Dakota: normal highs, lows, rain and records for September
Brookings in September has a normal high of 72°F and a normal low of 48°F, a daily mean of 60°F, falling from 77°F on the 1st to 66°F by the 30th. Measurable precipitation falls on 8 days in a normal September, 3.10 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 9°C, 79 mm of precipitation in September.
- NOAA stationBrookings (2 mi NE)
- Station IDUSC00391076
- Location44.33°N 96.77°W
- Elevation1,639 ft (500 m)
- From the center2 miles
- Population24,555
- Jan 22° 4°
- Feb 27° 7°
- Mar 39° 20°
- Apr 54° 32°
- May 67° 45°
- Jun 77° 56°
- Jul 81° 60°
- Aug 79° 57°
- Sep 72° 48°
- Oct 58° 34°
- Nov 41° 22°
- Dec 28° 10°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Brookings in September?
The normal high is 72°F and the normal low 48°F, for a daily mean of 60.1°F. September is 8.3°F cooler than August and 14.2°F warmer than October. September is the 4th warmest month of the year in Brookings and the 5th wettest. Across the month the normal high falls 11°F, from 77°F on September 1 to 66°F on September 30. From one year to the next September's mean temperature typically moves about 2.9°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 57°F and 63°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 29%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 77°F | 54°F | 29% | 16% |
| September 8 | 75°F | 52°F | 29% | 16% |
| September 15 | 73°F | 49°F | 29% | 16% |
| September 22 | 70°F | 46°F | 28% | 16% |
| September 30 | 66°F | 42°F | 27% | 15% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 77°F | 54°F | 29% | 16% | 13 h 20 min |
| September 2 | 76°F | 54°F | 29% | 16% | 13 h 10 min |
| September 3 | 76°F | 53°F | 29% | 16% | 13 h 10 min |
| September 4 | 76°F | 53°F | 29% | 16% | 13 h 10 min |
| September 5 | 76°F | 53°F | 29% | 16% | 13 h 10 min |
| September 6 | 75°F | 52°F | 29% | 16% | 13 h |
| September 7 | 75°F | 52°F | 29% | 16% | 13 h |
| September 8 | 75°F | 52°F | 29% | 16% | 13 h |
| September 9 | 75°F | 51°F | 29% | 16% | 12 h 50 min |
| September 10 | 74°F | 51°F | 29% | 16% | 12 h 50 min |
| September 11 | 74°F | 50°F | 29% | 16% | 12 h 50 min |
| September 12 | 74°F | 50°F | 29% | 16% | 12 h 40 min |
| September 13 | 73°F | 50°F | 29% | 16% | 12 h 40 min |
| September 14 | 73°F | 49°F | 29% | 16% | 12 h 40 min |
| September 15 | 73°F | 49°F | 29% | 16% | 12 h 40 min |
| September 16 | 72°F | 48°F | 29% | 16% | 12 h 30 min |
| September 17 | 72°F | 48°F | 28% | 16% | 12 h 30 min |
| September 18 | 71°F | 47°F | 28% | 16% | 12 h 30 min |
| September 19 | 71°F | 47°F | 28% | 16% | 12 h 20 min |
| September 20 | 71°F | 46°F | 28% | 16% | 12 h 20 min |
| September 21 | 70°F | 46°F | 28% | 16% | 12 h 20 min |
| September 22 | 70°F | 46°F | 28% | 16% | 12 h 10 min |
| September 23 | 69°F | 45°F | 28% | 16% | 12 h 10 min |
| September 24 | 69°F | 45°F | 28% | 16% | 12 h 10 min |
| September 25 | 69°F | 44°F | 28% | 16% | 12 h 10 min |
| September 26 | 68°F | 44°F | 28% | 16% | 12 h |
| September 27 | 68°F | 43°F | 28% | 16% | 12 h |
| September 28 | 67°F | 43°F | 27% | 16% | 12 h |
| September 29 | 67°F | 42°F | 27% | 15% | 11 h 50 min |
| September 30 | 66°F | 42°F | 27% | 15% | 11 h 50 min |
- Normal high
- 72°FSeptember average
- Normal low
- 48°FSeptember average
- Precipitation
- 3.10 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 1
- Nights at 32°F or colder
- 2
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 18
- Days at 80°F or more
- 8
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00391076; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Brookings in September?
On a given September day the chance of 0.01 inch or more is 28% on average, highest around September 1 (29%). In all, 3.10 in falls on 8 days of a normal September, 1 of them with an inch or more.
In a normal September in Brookings, 1 days reach 90°F and 2 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00391076.
What are the records for September in Brookings?
The warmest September temperature on this station's record (since 1893) is 102°F, on September 10, 1931; the coldest is 12°F, on September 29, 1899. The wettest September brought 8.43 in (2010); the snowiest, 2.0 inches (1912).
The September mean against the 1991-2020 normal of 60.1°F: 2021 63.0°F (+2.9), 2022 67.0°F (+6.9), 2023 65.2°F (+5.1), 2024 64.3°F (+4.2), 2025 64.8°F (+4.7), 2026 65.3°F (+5.2). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.0°F | +2.9°F | 3.29 in |
| 2022 | 67.0°F | +6.9°F | 0.83 in |
| 2023 | 65.2°F | +5.1°F | 1.31 in |
| 2024 | 64.3°F | +4.2°F | 0.09 in |
| 2025 | 64.8°F | +4.7°F | 1.48 in |
| 2026 | 65.3°F | +5.2°F | 3.63 in |
Source: records: ACIS, station USC00391076; recent months: ACIS, station USC00391076. Records and recent months use complete months only.
How does September in Brookings compare across South Dakota?
Across the 100 places PlainClimate covers in South Dakota, September normal highs run from 69°F in Custer to 82°F in Interior; Brookings's is 72°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Brookings in August79°F by day, 57°F at night
- Brookings in October58°F by day, 34°F at night
- Brookings through the yearEvery month, frost dates, records and recent years
- South Dakota in SeptemberThe statewide normal and the warmest and coolest places
- Interior: South Dakota's warmest Septembernormal high 82°F