Williamsburg, VA weather in September
September in Williamsburg: warm and often humid, with frequent rain. Highs 81°F, lows 63°F, about 10 days with rain.
- Normal high
- 81°F
- Normal low
- 63°F
- Wet days
- 10
- 5.4 in total
- Muggy days
- 15
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 84°F | 76°F |
| Normal low | 67°F | 58°F |
| Chance of a wet day | 32% | 32% |
| Sunrise / sunset | 6:37 am / 7:36 pm | 7:01 am / 6:52 pm |
| Daylight | 13.0 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical September day
- 6 am66°Fdew point 62°F
- 9 am75°Fdew point 64°F
- Noon79°Fdew point 63°F
- 3 pm79°Fdew point 63°F
- 6 pm74°Fdew point 63°F
- 9 pm69°Fdew point 63°F
NOAA hourly normals (local standard time) from Newport News Intl Airport (15 mi away); average wind 7 mph; clear or few clouds in 58% of daytime hours, mostly cloudy or overcast in 33%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F6 of 30
- Hot dayshigh 90°F or more3 of 30
- Muggy daysdaily mean dew point 65°F or more15 of 30
- Wet daysat least 0.01 in of rain or melted snow10 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 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 5.4 in; a dry September brings about 2.4 in and a wet one about 6.9 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20201998: average high 87°F
- Coolest September2006: average high 77°F
- Wettest September1999: 21.4 in
- Driest September2005: 0.7 in
- Highest reading98°F (September 1, 1993)
- Lowest reading44°F (September 23, 1999)
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 | 87°F | 81°F | 71°F |
| Normal low | 69°F | 63°F | 51°F |
| Wet days | 11 | 10 | 9 |
| Comfortable days | 0 | 6 | 15 |
| Daylight | 13.6 h | 12.4 h | 11.2 h |
Highs change by -6°F from August and -10°F into October.
Nearby alternatives in September
- Drier: Nags Head, NC109 mi · high 79°F · 7 wet days
- Cooler: Fayetteville, WV246 mi · high 76°F · 9 wet days
How Williamsburg ranks in September
- Normal high190th warmest of 378 cities; 3rd of 5 in Virginia
- Wet days321st driest of 378
- Comfortable days202nd most of 342
What to pack for Williamsburg in September
- A rain jacket or umbrella – rain on about 10 days
Heating and cooling
September has 14 heating degree days and 218 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How hot is Williamsburg in September?
The normal high is 81°F and the normal low is 63°F. From 1991 to 2020 the hottest September reading was 98°F (September 1, 1993).
Does it rain a lot in Williamsburg in September?
About 10 days in September have at least 0.01 in of precipitation, and the normal total is 5.4 in. The wettest September in 1991-2020 was in 1999 (21.4 in); the driest was in 2005 (0.7 in).
Is September a good time to visit Williamsburg?
September ranks 6th of 12 months on our comfort score for Williamsburg (54 out of 100). It has about 6 comfortable days and about 3 days at 90°F or hotter. The best months are April and May.
Where the numbers come from
- Temperature, rain and frost dates: Williamsburg 2 N (USC00449151), 2.1 mi N of the city center, 70 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: W Pt 2 Nw (USC00449025), 21 mi NNW of the city center, 20 ft (65 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Newport News Intl Airport (USW00093741), 15 mi SE of the city center, 42 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Nwpt News/Wimburg Intl Apt (723086-93741), 15 mi SE of the city center, 36 ft . Hourly observations, 1991-2020.