Jamestown weather in September: Jamestown, North Dakota: normal highs, lows, rain and records for September
Jamestown in September has a normal high of 71°F and a normal low of 46°F, a daily mean of 58°F, falling from 77°F on the 1st to 64°F by the 30th. Measurable precipitation falls on 8 days in a normal September, 2.06 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 8°C, 52 mm of precipitation in September.
- NOAA stationJamestown Municipal Airport
- Station IDUSW00014919
- Location46.93°N 98.67°W
- Elevation1,494 ft (455 m)
- From the center2 miles
- Population15,789
- Jan 19° 1°
- Feb 24° 5°
- Mar 37° 17°
- Apr 53° 30°
- May 67° 43°
- Jun 76° 54°
- Jul 81° 58°
- Aug 80° 55°
- Sep 71° 46°
- Oct 55° 33°
- Nov 38° 19°
- Dec 24° 7°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Jamestown in September?
The normal high is 71°F and the normal low 46°F, for a daily mean of 58.4°F. September is 9.1°F cooler than August and 14.6°F warmer than October. September is the 4th warmest month of the year in Jamestown and the 5th wettest. Across the month the normal high falls 13°F, from 77°F on September 1 to 64°F on September 30. From one year to the next September's mean temperature typically moves about 2.6°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 56°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 27%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 77°F | 51°F | 27% | 14% |
| September 8 | 74°F | 49°F | 26% | 13% |
| September 15 | 72°F | 46°F | 25% | 13% |
| September 22 | 68°F | 43°F | 24% | 12% |
| September 30 | 64°F | 40°F | 23% | 12% |
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 | 51°F | 27% | 14% | 13 h 20 min |
| September 2 | 76°F | 51°F | 27% | 14% | 13 h 20 min |
| September 3 | 76°F | 51°F | 26% | 14% | 13 h 20 min |
| September 4 | 76°F | 50°F | 26% | 13% | 13 h 10 min |
| September 5 | 75°F | 50°F | 26% | 13% | 13 h 10 min |
| September 6 | 75°F | 50°F | 26% | 13% | 13 h 10 min |
| September 7 | 75°F | 49°F | 26% | 13% | 13 h |
| September 8 | 74°F | 49°F | 26% | 13% | 13 h |
| September 9 | 74°F | 49°F | 26% | 13% | 13 h |
| September 10 | 74°F | 48°F | 26% | 13% | 12 h 50 min |
| September 11 | 73°F | 48°F | 25% | 13% | 12 h 50 min |
| September 12 | 73°F | 47°F | 25% | 13% | 12 h 50 min |
| September 13 | 72°F | 47°F | 25% | 13% | 12 h 50 min |
| September 14 | 72°F | 47°F | 25% | 13% | 12 h 40 min |
| September 15 | 72°F | 46°F | 25% | 13% | 12 h 40 min |
| September 16 | 71°F | 46°F | 25% | 13% | 12 h 40 min |
| September 17 | 71°F | 46°F | 25% | 12% | 12 h 30 min |
| September 18 | 70°F | 45°F | 25% | 12% | 12 h 30 min |
| September 19 | 70°F | 45°F | 25% | 12% | 12 h 30 min |
| September 20 | 69°F | 44°F | 25% | 12% | 12 h 20 min |
| September 21 | 69°F | 44°F | 25% | 12% | 12 h 20 min |
| September 22 | 68°F | 43°F | 24% | 12% | 12 h 20 min |
| September 23 | 68°F | 43°F | 24% | 12% | 12 h 10 min |
| September 24 | 67°F | 43°F | 24% | 12% | 12 h 10 min |
| September 25 | 67°F | 42°F | 24% | 12% | 12 h 10 min |
| September 26 | 66°F | 42°F | 24% | 12% | 12 h |
| September 27 | 66°F | 41°F | 24% | 12% | 12 h |
| September 28 | 65°F | 41°F | 24% | 12% | 12 h |
| September 29 | 65°F | 41°F | 23% | 12% | 11 h 50 min |
| September 30 | 64°F | 40°F | 23% | 12% | 11 h 50 min |
- Normal high
- 71°FSeptember average
- Normal low
- 46°FSeptember average
- Precipitation
- 2.06 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 1
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 17
- Days at 80°F or more
- 7
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014919; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Jamestown in September?
On a given September day the chance of 0.01 inch or more is 25% on average, highest around September 1 (27%). In all, 2.06 in falls on 8 days of a normal September.
In a normal September in Jamestown, 1 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014919.
How humid and windy is Jamestown in September?
At 3 p.m. the normal temperature is 62°F with 43% relative humidity and a dew point of 40°F; at 6 a.m. it is 44°F with 81% humidity. The wind averages 11.0 mph, most often from the west 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 | 39°F | 81% | 9.1 mph | – |
| 9 a.m. | 50°F | 41°F | 70% | 12.2 mph | – |
| noon | 59°F | 41°F | 50% | 14.3 mph | – |
| 3 p.m. | 62°F | 40°F | 43% | 14.5 mph | – |
| 6 p.m. | 58°F | 40°F | 52% | 10.2 mph | – |
| 9 p.m. | 50°F | 40°F | 68% | 9.2 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014919. 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 Jamestown?
The warmest September temperature on this station's record (since 1948) is 105°F, on September 5, 1978; the coldest is 18°F, on September 26, 1965. The wettest September brought 5.50 in (2019).
The September mean against the 1991-2020 normal of 58.4°F: 2021 63.0°F (+4.6), 2022 60.7°F (+2.3), 2023 62.4°F (+4.0), 2024 65.8°F (+7.4), 2025 62.1°F (+3.7), 2026 62.1°F (+3.7). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.0°F | +4.6°F | 2.47 in |
| 2022 | 60.7°F | +2.3°F | 0.68 in |
| 2023 | 62.4°F | +4.0°F | 3.60 in |
| 2024 | 65.8°F | +7.4°F | 0.62 in |
| 2025 | 62.1°F | +3.7°F | 1.18 in |
| 2026 | 62.1°F | +3.7°F | 4.34 in |
Source: records: ACIS, station USW00014919; recent months: ACIS, station USW00014919. Records and recent months use complete months only.
How does September in Jamestown 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; Jamestown's is 71°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Jamestown in August80°F by day, 55°F at night
- Jamestown in October55°F by day, 33°F at night
- Jamestown 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