Climate averages 1991–2020
Portsmouth Heights weather
in September.
A warm, wet month: the 4th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Portsmouth Heights: daytime highs average 26.4°C and nights cool to about 18.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 120 mm of rain on roughly 11 days, which makes September a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 27 min on an average September day.
The nearest other city in this atlas is Norfolk (8 km away). In September its highs average 26.1°C, about as warm as Portsmouth Heights, with 120 mm of rain.
Among the 498 cities listed in the United States, Portsmouth Heights ranks joint 263rd of 498 for the warmest September highs and joint 445th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Portsmouth Heights is 0.5°C cooler than that mean.
From September to October, average highs fall by 5.1°C to 21.2°C, and monthly rainfall falls from 120 mm to 94 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Portsmouth Heights climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.3°C0.8°C | 0.8°C | 87 | 9.0 | 9.910 h |
| February | 11.0°C1.6°C | 1.6°C | 77 | 9.0 | 10.811 h |
| March | 14.7°C4.8°C | 4.8°C | 98 | 10.4 | 11.912 h |
| April | 20.2°C9.9°C | 9.9°C | 84 | 9.7 | 13.113 h |
| May | 24.5°C14.9°C | 14.9°C | 95 | 10.9 | 14.114 h |
| June | 28.5°C19.6°C | 19.6°C | 103 | 11.7 | 14.615 h |
| July | 30.6°C22.3°C | 22.3°C | 131 | 15.1 | 14.414 h |
| August | 29.5°C21.6°C | 21.6°C | 119 | 12.9 | 13.614 h |
| September, selected | 26.4°C18.8°C | 18.8°C | 120 | 11.1 | 12.512 h |
| October | 21.2°C12.9°C | 12.9°C | 94 | 7.9 | 11.311 h |
| November | 15.6°C7.0°C | 7.0°C | 87 | 8.5 | 10.210 h |
| December | 11.4°C3.1°C | 3.1°C | 87 | 9.2 | 9.710 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Norfolk in SeptemberUnited States · 8 kmHigh 26.1°C · Low 19.1°C · 120 mm rain
- Newport News in SeptemberUnited States · 19 kmHigh 26.2°C · Low 19.1°C · 115 mm rain
- Suffolk in SeptemberUnited States · 22 kmHigh 26.6°C · Low 18.8°C · 123 mm rain
- East Hampton in SeptemberUnited States · 24 kmHigh 25.8°C · Low 19.6°C · 110 mm rain
- Virginia Beach in SeptemberUnited States · 35 kmHigh 25.0°C · Low 20.6°C · 114 mm rain
- Richmond in SeptemberUnited States · 126 kmHigh 26.3°C · Low 17.3°C · 112 mm rain
- Greenville in SeptemberUnited States · 161 kmHigh 27.0°C · Low 19.0°C · 132 mm rain
- Alexandria, United States in SeptemberUnited States · 228 kmHigh 25.7°C · Low 17.2°C · 106 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Portsmouth Heights) is explained once on the Portsmouth Heights year overview and on the Sources, method and limits page.
Norfolk lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.