Grand Forks, ND weather in September
In September, Grand Forks sees highs around 70°F and lows around 47°F: mild, with some rain. Rain falls on about 9 days. Great for outdoor plans.
- Normal high
- 70°F
- Normal low
- 47°F
- Wet days
- 9
- 2.4 in total
- Muggy days
- 1
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 76°F | 63°F |
| Normal low | 53°F | 42°F |
| Chance of a wet day | 30% | 28% |
| Sunrise / sunset | 6:46 am / 8:09 pm | 7:26 am / 7:10 pm |
| Daylight | 13.4 h | 11.7 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical September day
- 6 am49°Fdew point 46°F
- 9 am58°Fdew point 49°F
- Noon66°Fdew point 49°F
- 3 pm69°Fdew point 48°F
- 6 pm65°Fdew point 48°F
- 9 pm56°Fdew point 49°F
NOAA hourly normals (local standard time) from Grand Forks Af (17 mi away); average wind 10 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F15 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more1 of 30
- Wet daysat least 0.01 in of rain or melted snow9 of 30
- Notable rainat least 0.10 in4 of 30
- Freezing nightslow 32°F or below1 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 2.4 in; a dry September brings about 1.1 in and a wet one about 3.0 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202009: average high 75°F
- Coolest September1999: average high 64°F
- Wettest September2019: 9.1 in
- Driest September1993: 0.2 in
- Highest reading96°F (September 5, 2001)
- Lowest reading25°F (September 28, 1992)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 79°F | 70°F | 53°F |
| Normal low | 57°F | 47°F | 35°F |
| Wet days | 9 | 9 | 8 |
| Comfortable days | 12 | 15 | 5 |
| Daylight | 14.2 h | 12.6 h | 10.8 h |
Highs change by -9°F from August and -17°F into October.
Nearby alternatives in September
- Warmer: Aberdeen, SD183 mi · high 75°F · 8 wet days
How Grand Forks ranks in September
- Normal high353rd warmest of 378 cities; 4th of 4 in North Dakota
- Wet days230th driest of 378
- Comfortable days85th most of 342
What to pack for Grand Forks in September
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 225 heating degree days and 32 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Grand Forks in September?
The normal high is 70°F and the normal low is 47°F. From 1991 to 2020 the hottest September reading was 96°F (September 5, 2001).
Does it rain a lot in Grand Forks in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 2.4 in. The wettest September in 1991-2020 was in 2019 (9.1 in); the driest was in 1993 (0.2 in).
Is September a good time to visit Grand Forks?
September ranks 3rd of 12 months on our comfort score for Grand Forks (70 out of 100). It has about 15 comfortable days and about 1 day at 90°F or hotter. The best months are May, June and September.
Where the numbers come from
- Temperature, rain, snowfall and frost dates: Grand Forks Univ (NWS) (USC00323621), 3.0 mi W of the city center, 830 ft . NOAA normals and daily records, 1991-2020.
- Snow depth: Grand Forks Intl Airport (USW00014916), 7.1 mi W of the city center, 842 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Grand Forks Af (USW00094925), 17 mi W of the city center, 906 ft (76 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Grand Forks AFB Airport (727575-94925), 17 mi W of the city center, 913 ft (83 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).