Williston weather in September: Williston, North Dakota: normal highs, lows, rain and records for September
Williston in September has a normal high of 73°F and a normal low of 44°F, a daily mean of 58°F, falling from 79°F on the 1st to 65°F by the 30th. Measurable precipitation falls on 8 days in a normal September, 1.36 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 6°C, 35 mm of precipitation in September.
- NOAA stationWilliston Sloulin Field
- Station IDUSW00094014
- Location48.17°N 103.64°W
- Elevation1,902 ft (580 m)
- Population28,821
- Jan 22° 1°
- Feb 27° 6°
- Mar 40° 18°
- Apr 56° 29°
- May 67° 40°
- Jun 77° 50°
- Jul 85° 56°
- Aug 84° 54°
- Sep 73° 44°
- Oct 56° 30°
- Nov 38° 17°
- Dec 26° 6°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Williston in September?
The normal high is 73°F and the normal low 44°F, for a daily mean of 58.0°F. September is 11.0°F cooler than August and 14.8°F warmer than October. September is the 4th warmest month of the year in Williston and the 5th wettest. Across the month the normal high falls 14°F, from 79°F on September 1 to 65°F on September 30. From one year to the next September's mean temperature typically moves about 2.8°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 25%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 49°F | 25% | 11% |
| September 8 | 76°F | 46°F | 25% | 11% |
| September 15 | 73°F | 44°F | 25% | 11% |
| September 22 | 70°F | 41°F | 25% | 11% |
| September 30 | 65°F | 38°F | 24% | 10% |
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 | 79°F | 49°F | 25% | 11% | 13 h 30 min |
| September 2 | 79°F | 49°F | 25% | 11% | 13 h 20 min |
| September 3 | 78°F | 48°F | 25% | 11% | 13 h 20 min |
| September 4 | 78°F | 48°F | 25% | 11% | 13 h 20 min |
| September 5 | 77°F | 48°F | 25% | 11% | 13 h 10 min |
| September 6 | 77°F | 47°F | 25% | 11% | 13 h 10 min |
| September 7 | 77°F | 47°F | 25% | 11% | 13 h 10 min |
| September 8 | 76°F | 46°F | 25% | 11% | 13 h |
| September 9 | 76°F | 46°F | 25% | 11% | 13 h |
| September 10 | 75°F | 46°F | 25% | 11% | 13 h |
| September 11 | 75°F | 45°F | 25% | 11% | 12 h 50 min |
| September 12 | 74°F | 45°F | 25% | 11% | 12 h 50 min |
| September 13 | 74°F | 45°F | 25% | 11% | 12 h 50 min |
| September 14 | 74°F | 44°F | 25% | 11% | 12 h 40 min |
| September 15 | 73°F | 44°F | 25% | 11% | 12 h 40 min |
| September 16 | 73°F | 43°F | 25% | 11% | 12 h 40 min |
| September 17 | 72°F | 43°F | 25% | 11% | 12 h 30 min |
| September 18 | 72°F | 43°F | 25% | 11% | 12 h 30 min |
| September 19 | 71°F | 42°F | 25% | 11% | 12 h 30 min |
| September 20 | 71°F | 42°F | 25% | 11% | 12 h 20 min |
| September 21 | 70°F | 41°F | 25% | 11% | 12 h 20 min |
| September 22 | 70°F | 41°F | 25% | 11% | 12 h 20 min |
| September 23 | 69°F | 41°F | 25% | 11% | 12 h 10 min |
| September 24 | 69°F | 40°F | 25% | 11% | 12 h 10 min |
| September 25 | 68°F | 40°F | 24% | 10% | 12 h 10 min |
| September 26 | 68°F | 39°F | 24% | 10% | 12 h |
| September 27 | 67°F | 39°F | 24% | 10% | 12 h |
| September 28 | 67°F | 39°F | 24% | 10% | 11 h 50 min |
| September 29 | 66°F | 38°F | 24% | 10% | 11 h 50 min |
| September 30 | 65°F | 38°F | 24% | 10% | 11 h 50 min |
- Normal high
- 73°FSeptember average
- Normal low
- 44°FSeptember average
- Precipitation
- 1.36 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 2
- Nights at 32°F or colder
- 3
- Daylight
- 13 h 30 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
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094014; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Williston in September?
On a given September day the chance of 0.01 inch or more is 25% on average, highest around September 15 (25%). In all, 1.36 in falls on 8 days of a normal September.
In a normal September in Williston, 2 days reach 90°F and 3 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094014.
How humid and windy is Williston in September?
At 3 p.m. the normal temperature is 63°F with 38% relative humidity and a dew point of 37°F; at 6 a.m. it is 42°F with 80% humidity. The wind averages 8.6 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. | 42°F | 36°F | 80% | 6.2 mph | 64% |
| 9 a.m. | 47°F | 38°F | 70% | 8.2 mph | 68% |
| noon | 58°F | 38°F | 47% | 11.6 mph | 63% |
| 3 p.m. | 63°F | 37°F | 38% | 12.8 mph | 66% |
| 6 p.m. | 60°F | 37°F | 42% | 10.1 mph | 63% |
| 9 p.m. | 50°F | 37°F | 62% | 7.0 mph | 72% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094014. 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 Williston?
The warmest September temperature on Williston's official record (since 1894) is 104°F, on September 1, 1983; the coldest is 13°F, on September 29, 1907. The wettest September brought 8.09 in (2019); the snowiest, 4.0 inches (1984).
Source: records: ACIS, NWS threaded record ISNthr. Records and recent months use complete months only.
How does September in Williston 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; Williston's is 73°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Williston in August84°F by day, 54°F at night
- Williston in October56°F by day, 30°F at night
- Williston 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