Williamsburg weather in September: Williamsburg, Virginia: normal highs, lows, rain and records for September
Williamsburg in September has a normal high of 81°F and a normal low of 63°F, a daily mean of 72°F, falling from 84°F on the 1st to 76°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 5.40 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 17°C, 137 mm of precipitation in September.
- NOAA stationWilliamsburg (2 mi N)
- Station IDUSC00449151
- Location37.30°N 76.70°W
- Elevation70 ft (21 m)
- Population16,030
- Jan 49° 31°
- Feb 52° 32°
- Mar 60° 39°
- Apr 70° 48°
- May 77° 57°
- Jun 84° 65°
- Jul 89° 70°
- Aug 87° 69°
- Sep 81° 63°
- Oct 71° 51°
- Nov 61° 41°
- Dec 53° 34°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Williamsburg in September?
The normal high is 81°F and the normal low 63°F, for a daily mean of 71.8°F. September is 5.8°F cooler than August and 10.7°F warmer than October. September is the 4th warmest month of the year in Williamsburg and the 3rd wettest. Across the month the normal high falls 8°F, from 84°F on September 1 to 76°F on September 30. From one year to the next September's mean temperature typically moves about 2.2°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 70°F and 74°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 32%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 84°F | 67°F | 32% | 21% |
| September 8 | 83°F | 66°F | 32% | 20% |
| September 15 | 81°F | 64°F | 32% | 20% |
| September 22 | 79°F | 61°F | 32% | 20% |
| September 30 | 76°F | 58°F | 31% | 19% |
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 | 84°F | 67°F | 32% | 21% | 13 h |
| September 2 | 84°F | 67°F | 32% | 21% | 13 h |
| September 3 | 84°F | 67°F | 32% | 21% | 13 h |
| September 4 | 84°F | 66°F | 32% | 21% | 12 h 50 min |
| September 5 | 83°F | 66°F | 32% | 21% | 12 h 50 min |
| September 6 | 83°F | 66°F | 32% | 21% | 12 h 50 min |
| September 7 | 83°F | 66°F | 32% | 21% | 12 h 50 min |
| September 8 | 83°F | 66°F | 32% | 20% | 12 h 50 min |
| September 9 | 82°F | 65°F | 32% | 20% | 12 h 40 min |
| September 10 | 82°F | 65°F | 32% | 20% | 12 h 40 min |
| September 11 | 82°F | 65°F | 32% | 20% | 12 h 40 min |
| September 12 | 82°F | 65°F | 32% | 20% | 12 h 40 min |
| September 13 | 81°F | 64°F | 32% | 20% | 12 h 30 min |
| September 14 | 81°F | 64°F | 32% | 20% | 12 h 30 min |
| September 15 | 81°F | 64°F | 32% | 20% | 12 h 30 min |
| September 16 | 81°F | 63°F | 32% | 20% | 12 h 30 min |
| September 17 | 80°F | 63°F | 32% | 20% | 12 h 20 min |
| September 18 | 80°F | 63°F | 32% | 20% | 12 h 20 min |
| September 19 | 80°F | 62°F | 32% | 20% | 12 h 20 min |
| September 20 | 79°F | 62°F | 32% | 20% | 12 h 20 min |
| September 21 | 79°F | 62°F | 32% | 20% | 12 h 10 min |
| September 22 | 79°F | 61°F | 32% | 20% | 12 h 10 min |
| September 23 | 78°F | 61°F | 32% | 20% | 12 h 10 min |
| September 24 | 78°F | 61°F | 32% | 20% | 12 h 10 min |
| September 25 | 78°F | 60°F | 32% | 19% | 12 h 10 min |
| September 26 | 78°F | 60°F | 32% | 19% | 12 h |
| September 27 | 77°F | 59°F | 32% | 19% | 12 h |
| September 28 | 77°F | 59°F | 32% | 19% | 12 h |
| September 29 | 77°F | 59°F | 32% | 19% | 12 h |
| September 30 | 76°F | 58°F | 31% | 19% | 11 h 50 min |
- Normal high
- 81°FSeptember average
- Normal low
- 63°FSeptember average
- Precipitation
- 5.40 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 3
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 29
- Days at 80°F or more
- 18
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00449151; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Williamsburg in September?
On a given September day the chance of 0.01 inch or more is 32% on average, highest around September 1 (32%). In all, 5.40 in falls on 10 days of a normal September, 2 of them with an inch or more.
In a normal September in Williamsburg, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00449151.
What are the records for September in Williamsburg?
The warmest September temperature on this station's record (since 1951) is 103°F, on September 7, 1954; the coldest is 38°F, on September 23, 1983. The wettest September brought 21.35 in (1999).
The September mean against the 1991-2020 normal of 71.8°F: 2021 72.4°F (+0.6), 2022 72.6°F (+0.8), 2023 72.4°F (+0.6), 2024 71.5°F (−0.3), 2025 70.5°F (−1.3), 2026 74.7°F (+2.9). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.4°F | +0.6°F | 2.96 in |
| 2022 | 72.6°F | +0.8°F | 4.83 in |
| 2023 | 72.4°F | +0.6°F | 5.84 in |
| 2024 | 71.5°F | −0.3°F | 4.88 in |
| 2025 | 70.5°F | −1.3°F | 9.82 in |
| 2026 | 74.7°F | +2.9°F | 4.40 in |
Source: records: ACIS, station USC00449151; recent months: ACIS, station USC00449151. Records and recent months use complete months only.
How does September in Williamsburg compare across Virginia?
Across the 81 places PlainClimate covers in Virginia, September normal highs run from 73°F in Floyd to 85°F in Chesapeake; Williamsburg's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Williamsburg in August87°F by day, 69°F at night
- Williamsburg in October71°F by day, 51°F at night
- Williamsburg through the yearEvery month, frost dates, records and recent years
- Virginia in SeptemberThe statewide normal and the warmest and coolest places
- Chesapeake: Virginia's warmest Septembernormal high 85°F