Grand Forks weather in September: Grand Forks, North Dakota: normal highs, lows, rain and records for September
Grand Forks in September has a normal high of 70°F and a normal low of 45°F, a daily mean of 58°F, falling from 76°F on the 1st to 63°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 2.26 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 21°C and low of 7°C, 57 mm of precipitation in September.
- NOAA stationGrand Forks International Airport
- Station IDUSW00014916
- Location47.94°N 97.18°W
- Elevation842 ft (257 m)
- From the center5 miles
- Population59,845
- Jan 16° -3°
- Feb 21° 1°
- Mar 34° 15°
- Apr 52° 29°
- May 67° 41°
- Jun 76° 53°
- Jul 81° 57°
- Aug 80° 54°
- Sep 70° 45°
- Oct 54° 33°
- Nov 36° 18°
- Dec 21° 4°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Grand Forks in September?
The normal high is 70°F and the normal low 45°F, for a daily mean of 57.9°F. September is 9.1°F cooler than August and 14.7°F warmer than October. September is the 4th warmest month of the year in Grand Forks and the 5th wettest. Across the month the normal high falls 13°F, from 76°F on September 1 to 63°F on September 30. From one year to the next September's mean temperature typically moves about 2.7°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 55°F and 61°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 | 76°F | 51°F | 29% | 16% |
| September 8 | 74°F | 48°F | 29% | 15% |
| September 15 | 71°F | 46°F | 28% | 14% |
| September 22 | 68°F | 43°F | 28% | 14% |
| September 30 | 63°F | 40°F | 28% | 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 | 76°F | 51°F | 29% | 16% | 13 h 30 min |
| September 2 | 76°F | 50°F | 29% | 16% | 13 h 20 min |
| September 3 | 76°F | 50°F | 29% | 16% | 13 h 20 min |
| September 4 | 75°F | 50°F | 29% | 15% | 13 h 20 min |
| September 5 | 75°F | 49°F | 29% | 15% | 13 h 10 min |
| September 6 | 75°F | 49°F | 29% | 15% | 13 h 10 min |
| September 7 | 74°F | 49°F | 29% | 15% | 13 h 10 min |
| September 8 | 74°F | 48°F | 29% | 15% | 13 h |
| September 9 | 73°F | 48°F | 29% | 15% | 13 h |
| September 10 | 73°F | 48°F | 29% | 15% | 13 h |
| September 11 | 73°F | 47°F | 29% | 15% | 12 h 50 min |
| September 12 | 72°F | 47°F | 29% | 15% | 12 h 50 min |
| September 13 | 72°F | 46°F | 29% | 14% | 12 h 50 min |
| September 14 | 71°F | 46°F | 29% | 14% | 12 h 40 min |
| September 15 | 71°F | 46°F | 28% | 14% | 12 h 40 min |
| September 16 | 71°F | 45°F | 28% | 14% | 12 h 40 min |
| September 17 | 70°F | 45°F | 28% | 14% | 12 h 30 min |
| September 18 | 70°F | 45°F | 28% | 14% | 12 h 30 min |
| September 19 | 69°F | 44°F | 28% | 14% | 12 h 30 min |
| September 20 | 69°F | 44°F | 28% | 14% | 12 h 20 min |
| September 21 | 68°F | 43°F | 28% | 14% | 12 h 20 min |
| September 22 | 68°F | 43°F | 28% | 14% | 12 h 20 min |
| September 23 | 67°F | 43°F | 28% | 14% | 12 h 10 min |
| September 24 | 67°F | 42°F | 28% | 13% | 12 h 10 min |
| September 25 | 66°F | 42°F | 28% | 13% | 12 h 10 min |
| September 26 | 66°F | 41°F | 28% | 13% | 12 h |
| September 27 | 65°F | 41°F | 28% | 13% | 12 h |
| September 28 | 65°F | 40°F | 28% | 13% | 11 h 50 min |
| September 29 | 64°F | 40°F | 28% | 13% | 11 h 50 min |
| September 30 | 63°F | 40°F | 28% | 13% | 11 h 50 min |
- Normal high
- 70°FSeptember average
- Normal low
- 45°FSeptember average
- Precipitation
- 2.26 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 1
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 30 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 17
- Days at 80°F or more
- 6
- Sunshine
- 75%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014916; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Grand Forks 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, 2.26 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Grand Forks, 1 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014916.
What are the records for September in Grand Forks?
The warmest September temperature on Grand Forks's official record (since 1941) is 103°F, on September 2, 1983; the coldest is 18°F, on September 28, 1942. The wettest September brought 8.14 in (2019).
The September mean against the 1991-2020 normal of 57.9°F: 2021 63.0°F (+5.1), 2022 60.2°F (+2.3), 2023 63.7°F (+5.8), 2024 67.0°F (+9.1), 2025 62.9°F (+5.0), 2026 62.3°F (+4.4). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.0°F | +5.1°F | 1.37 in |
| 2022 | 60.2°F | +2.3°F | 0.53 in |
| 2023 | 63.7°F | +5.8°F | 2.60 in |
| 2024 | 67.0°F | +9.1°F | 0.43 in |
| 2025 | 62.9°F | +5.0°F | 1.95 in |
| 2026 | 62.3°F | +4.4°F | 5.29 in |
Source: records: ACIS, NWS threaded record GFKthr; recent months: ACIS, station USW00014916. Records and recent months use complete months only.
How does September in Grand Forks compare across North Dakota?
Across the 92 places PlainClimate covers in North Dakota, September normal highs run from 65°F in Rolla to 77°F in Beulah; Grand Forks's is 70°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Grand Forks in August80°F by day, 54°F at night
- Grand Forks in October54°F by day, 33°F at night
- Grand Forks through the yearEvery month, frost dates, records and recent years
- North Dakota in SeptemberThe statewide normal and the warmest and coolest places
- Beulah: North Dakota's warmest Septembernormal high 77°F