Climate averages 1991–2020
Reading, United States weather
in September.
A warm, wet month: the 4th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Reading, United States: daytime highs average 24.7°C and nights cool to about 15.2°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 108 mm of rain on roughly 9 days, which makes September a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 30 min on an average September day.
The nearest other city in this atlas is Allentown (48 km away). In September its highs average 24.1°C, 0.6°C cooler than Reading, United States, with 113 mm of rain.
Among the 498 cities listed in the United States, Reading, United States ranks joint 322nd of 498 for the warmest September highs and joint 420th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Reading, United States is 2.2°C cooler than that mean.
From September to October, average highs fall by 7.0°C to 17.7°C, and monthly rainfall falls from 108 mm to 95 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
Reading, United States climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.4°C-4.4°C | -4.4°C | 82 | 9.3 | 9.610 h |
| February | 5.0°C-4.0°C | -4.0°C | 75 | 9.0 | 10.611 h |
| March | 9.7°C-0.1°C | -0.1°C | 99 | 10.6 | 11.912 h |
| April | 16.4°C5.7°C | 5.7°C | 96 | 10.8 | 13.313 h |
| May | 22.0°C11.5°C | 11.5°C | 92 | 11.3 | 14.414 h |
| June | 27.0°C16.8°C | 16.8°C | 96 | 11.0 | 15.015 h |
| July | 29.7°C19.7°C | 19.7°C | 95 | 10.7 | 14.715 h |
| August | 28.7°C18.9°C | 18.9°C | 85 | 9.8 | 13.814 h |
| September, selected | 24.7°C15.2°C | 15.2°C | 108 | 9.1 | 12.513 h |
| October | 17.7°C8.9°C | 8.9°C | 95 | 8.7 | 11.211 h |
| November | 11.3°C3.2°C | 3.2°C | 77 | 8.1 | 10.010 h |
| December | 5.9°C-1.3°C | -1.3°C | 94 | 9.1 | 9.49 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
- Allentown in SeptemberUnited States · 48 kmHigh 24.1°C · Low 14.1°C · 113 mm rain
- Bethlehem, United States in SeptemberUnited States · 57 kmHigh 24.1°C · Low 14.1°C · 109 mm rain
- Wilmington (Delaware), United States in SeptemberUnited States · 73 kmHigh 24.6°C · Low 16.3°C · 107 mm rain
- Philadelphia in SeptemberUnited States · 78 kmHigh 25.1°C · Low 16.3°C · 104 mm rain
- Camden in SeptemberUnited States · 82 kmHigh 25.0°C · Low 16.3°C · 99 mm rain
- Cherry Hill in SeptemberUnited States · 88 kmHigh 24.9°C · Low 16.4°C · 99 mm rain
- Trenton in SeptemberUnited States · 101 kmHigh 24.7°C · Low 15.7°C · 101 mm rain
- Scranton in SeptemberUnited States · 121 kmHigh 22.6°C · Low 13.6°C · 95 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 Reading) is explained once on the Reading, United States year overview and on the Sources, method and limits page.