Jamestown weather in September: Jamestown, New York: normal highs, lows, rain and records for September
Jamestown in September has a normal high of 73°F and a normal low of 50°F, a daily mean of 61°F, falling from 78°F on the 1st to 67°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 4.19 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 10°C, 106 mm of precipitation in September.
- NOAA stationJamestown (4 mi ENE)
- Station IDUSC00304207
- Location42.11°N 79.16°W
- Elevation1,250 ft (381 m)
- From the center4 miles
- Population27,699
- Jan 32° 16°
- Feb 35° 16°
- Mar 44° 23°
- Apr 57° 34°
- May 69° 44°
- Jun 77° 54°
- Jul 80° 57°
- Aug 79° 56°
- Sep 73° 50°
- Oct 61° 39°
- Nov 48° 31°
- Dec 37° 23°
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 73°F and the normal low 50°F, for a daily mean of 61.2°F. September is 6.6°F cooler than August and 11.2°F warmer than October. September is the 4th warmest month of the year in Jamestown and the 3rd wettest. Across the month the normal high falls 11°F, from 78°F on September 1 to 67°F on September 30. From one year to the next September's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 59°F and 64°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 41%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 78°F | 54°F | 35% | 24% |
| September 8 | 76°F | 52°F | 36% | 24% |
| September 15 | 74°F | 50°F | 37% | 25% |
| September 22 | 71°F | 47°F | 39% | 26% |
| September 30 | 67°F | 45°F | 41% | 27% |
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 | 78°F | 54°F | 35% | 24% | 13 h 10 min |
| September 2 | 77°F | 54°F | 35% | 24% | 13 h 10 min |
| September 3 | 77°F | 53°F | 35% | 24% | 13 h 10 min |
| September 4 | 77°F | 53°F | 35% | 24% | 13 h |
| September 5 | 77°F | 53°F | 35% | 24% | 13 h |
| September 6 | 76°F | 53°F | 36% | 24% | 13 h |
| September 7 | 76°F | 52°F | 36% | 24% | 13 h |
| September 8 | 76°F | 52°F | 36% | 24% | 12 h 50 min |
| September 9 | 76°F | 52°F | 36% | 24% | 12 h 50 min |
| September 10 | 75°F | 51°F | 36% | 25% | 12 h 50 min |
| September 11 | 75°F | 51°F | 37% | 25% | 12 h 40 min |
| September 12 | 75°F | 51°F | 37% | 25% | 12 h 40 min |
| September 13 | 74°F | 51°F | 37% | 25% | 12 h 40 min |
| September 14 | 74°F | 50°F | 37% | 25% | 12 h 40 min |
| September 15 | 74°F | 50°F | 37% | 25% | 12 h 30 min |
| September 16 | 73°F | 50°F | 37% | 25% | 12 h 30 min |
| September 17 | 73°F | 49°F | 37% | 25% | 12 h 30 min |
| September 18 | 72°F | 49°F | 38% | 25% | 12 h 20 min |
| September 19 | 72°F | 49°F | 38% | 25% | 12 h 20 min |
| September 20 | 72°F | 48°F | 38% | 25% | 12 h 20 min |
| September 21 | 71°F | 48°F | 38% | 26% | 12 h 20 min |
| September 22 | 71°F | 47°F | 39% | 26% | 12 h 10 min |
| September 23 | 70°F | 47°F | 39% | 26% | 12 h 10 min |
| September 24 | 70°F | 47°F | 39% | 26% | 12 h 10 min |
| September 25 | 69°F | 46°F | 40% | 26% | 12 h 10 min |
| September 26 | 69°F | 46°F | 40% | 26% | 12 h |
| September 27 | 69°F | 46°F | 40% | 27% | 12 h |
| September 28 | 68°F | 45°F | 41% | 27% | 12 h |
| September 29 | 68°F | 45°F | 41% | 27% | 11 h 50 min |
| September 30 | 67°F | 45°F | 41% | 27% | 11 h 50 min |
- Normal high
- 73°FSeptember average
- Normal low
- 50°FSeptember average
- Precipitation
- 4.19 inmonth total
- Days with precipitation
- 110.01 inch or more
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 20
- Days at 80°F or more
- 7
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00304207; 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 38% on average, highest around September 30 (41%). In all, 4.19 in falls on 11 days of a normal September, 1 of them with an inch or more.
In a normal September in Jamestown, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00304207.
What are the records for September in Jamestown?
The warmest September temperature on Jamestown's official record (since 1895) is 98°F, on September 2, 1953; the coldest is 24°F, on September 22, 1904. The wettest September brought 9.20 in (1938); the snowiest, 2.0 inches (1899).
The September mean against the 1991-2020 normal of 61.2°F: 2021 63.7°F (+2.5), 2022 62.2°F (+1.0), 2023 63.1°F (+1.9), 2024 64.7°F (+3.5), 2025 61.9°F (+0.7). 5 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.7°F | +2.5°F | 4.14 in |
| 2022 | 62.2°F | +1.0°F | 7.67 in |
| 2023 | 63.1°F | +1.9°F | 2.09 in |
| 2024 | 64.7°F | +3.5°F | 3.12 in |
| 2025 | 61.9°F | +0.7°F | 1.23 in |
Source: records: ACIS, NWS threaded record JSTN6thr; recent months: ACIS, station USC00304207. Records and recent months use complete months only.
How does September in Jamestown compare across New York?
Across the 131 places PlainClimate covers in New York, September normal highs run from 64°F in Cooperstown to 78°F in Wantagh; Jamestown's is 73°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.