Aberdeen weather in September: Aberdeen, South Dakota: normal highs, lows, rain and records for September
Aberdeen in September has a normal high of 75°F and a normal low of 47°F, a daily mean of 61°F, falling from 80°F on the 1st to 69°F by the 30th. Measurable precipitation falls on 8 days in a normal September, 1.99 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 8°C, 51 mm of precipitation in September.
- NOAA stationAberdeen Regional Airport
- Station IDUSW00014929
- Location45.46°N 98.41°W
- Elevation1,302 ft (397 m)
- Population27,919
- Jan 24° 2°
- Feb 29° 6°
- Mar 42° 19°
- Apr 58° 31°
- May 70° 44°
- Jun 80° 55°
- Jul 85° 60°
- Aug 83° 57°
- Sep 75° 47°
- Oct 59° 33°
- Nov 43° 19°
- Dec 29° 8°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Aberdeen in September?
The normal high is 75°F and the normal low 47°F, for a daily mean of 60.9°F. September is 8.8°F cooler than August and 14.6°F warmer than October. September is the 4th warmest month of the year in Aberdeen and the 6th wettest. Across the month the normal high falls 11°F, from 80°F on September 1 to 69°F on September 30. From one year to the next September's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 59°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 26%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 80°F | 52°F | 26% | 13% |
| September 8 | 78°F | 50°F | 26% | 13% |
| September 15 | 76°F | 47°F | 26% | 13% |
| September 22 | 73°F | 44°F | 26% | 13% |
| September 30 | 69°F | 41°F | 26% | 13% |
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 | 80°F | 52°F | 26% | 13% | 13 h 20 min |
| September 2 | 80°F | 52°F | 26% | 13% | 13 h 20 min |
| September 3 | 79°F | 52°F | 26% | 13% | 13 h 10 min |
| September 4 | 79°F | 51°F | 26% | 13% | 13 h 10 min |
| September 5 | 79°F | 51°F | 26% | 13% | 13 h 10 min |
| September 6 | 79°F | 51°F | 26% | 13% | 13 h |
| September 7 | 78°F | 50°F | 26% | 13% | 13 h |
| September 8 | 78°F | 50°F | 26% | 13% | 13 h |
| September 9 | 78°F | 50°F | 26% | 13% | 13 h |
| September 10 | 77°F | 49°F | 26% | 13% | 12 h 50 min |
| September 11 | 77°F | 49°F | 26% | 13% | 12 h 50 min |
| September 12 | 77°F | 48°F | 26% | 13% | 12 h 50 min |
| September 13 | 76°F | 48°F | 26% | 13% | 12 h 40 min |
| September 14 | 76°F | 48°F | 26% | 13% | 12 h 40 min |
| September 15 | 76°F | 47°F | 26% | 13% | 12 h 40 min |
| September 16 | 75°F | 47°F | 26% | 13% | 12 h 30 min |
| September 17 | 75°F | 46°F | 26% | 13% | 12 h 30 min |
| September 18 | 74°F | 46°F | 26% | 13% | 12 h 30 min |
| September 19 | 74°F | 46°F | 26% | 13% | 12 h 20 min |
| September 20 | 73°F | 45°F | 26% | 13% | 12 h 20 min |
| September 21 | 73°F | 45°F | 26% | 13% | 12 h 20 min |
| September 22 | 73°F | 44°F | 26% | 13% | 12 h 10 min |
| September 23 | 72°F | 44°F | 26% | 13% | 12 h 10 min |
| September 24 | 72°F | 43°F | 26% | 13% | 12 h 10 min |
| September 25 | 71°F | 43°F | 26% | 13% | 12 h 10 min |
| September 26 | 71°F | 43°F | 26% | 13% | 12 h |
| September 27 | 70°F | 42°F | 26% | 13% | 12 h |
| September 28 | 70°F | 42°F | 26% | 13% | 12 h |
| September 29 | 69°F | 41°F | 26% | 13% | 11 h 50 min |
| September 30 | 69°F | 41°F | 26% | 13% | 11 h 50 min |
- Normal high
- 75°FSeptember average
- Normal low
- 47°FSeptember average
- Precipitation
- 1.99 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 2
- 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
- 20
- Days at 80°F or more
- 10
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014929; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Aberdeen in September?
On a given September day the chance of 0.01 inch or more is 26% on average, highest around September 20 (26%). In all, 1.99 in falls on 8 days of a normal September.
In a normal September in Aberdeen, 2 days reach 90°F and 2 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014929.
How humid and windy is Aberdeen in September?
At 3 p.m. the normal temperature is 65°F with 42% relative humidity and a dew point of 42°F; at 6 a.m. it is 44°F with 84% humidity. The wind averages 10.2 mph, most often from the west-northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 44°F | 40°F | 84% | 8.1 mph | 64% |
| 9 a.m. | 52°F | 43°F | 70% | 11.4 mph | 72% |
| noon | 62°F | 42°F | 49% | 13.2 mph | 62% |
| 3 p.m. | 65°F | 42°F | 42% | 13.9 mph | 70% |
| 6 p.m. | 60°F | 42°F | 51% | 9.5 mph | 65% |
| 9 p.m. | 52°F | 42°F | 70% | 8.6 mph | 76% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014929. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Aberdeen?
The warmest September temperature on Aberdeen's official record (since 1893) is 107°F, on September 10, 1931; the coldest is 11°F, on September 29, 1939. The wettest September brought 6.00 in (1921).
The September mean against the 1991-2020 normal of 60.9°F: 2021 64.6°F (+3.7), 2022 64.3°F (+3.4), 2023 65.5°F (+4.6), 2024 67.7°F (+6.8), 2025 64.6°F (+3.7), 2026 65.0°F (+4.1). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 64.6°F | +3.7°F | 2.05 in |
| 2022 | 64.3°F | +3.4°F | 0.11 in |
| 2023 | 65.5°F | +4.6°F | 3.17 in |
| 2024 | 67.7°F | +6.8°F | 0.42 in |
| 2025 | 64.6°F | +3.7°F | 2.26 in |
| 2026 | 65.0°F | +4.1°F | 2.91 in |
Source: records: ACIS, NWS threaded record ABRthr; recent months: ACIS, station USW00014929. Records and recent months use complete months only.
How does September in Aberdeen 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; Aberdeen's is 75°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Aberdeen in August83°F by day, 57°F at night
- Aberdeen in October59°F by day, 33°F at night
- Aberdeen 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