Climate averages 1991–2020
Edison weather
in August.
A hot, wet month: the 2nd warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Edison: daytime highs average 28.2°C and nights cool to about 19.5°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 103 mm of rain on roughly 10 days, which makes August a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 47 min on an average August day.
The nearest other city in this atlas is Staten Island (24 km away). In August its highs average 27.9°C, about as warm as Edison, with 104 mm of rain.
Among the 498 cities listed in the United States, Edison ranks joint 313th of 498 for the warmest August highs and joint 420th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Edison is 1.7°C cooler than that mean.
From August to September, average highs fall by 3.9°C to 24.3°C, and monthly rainfall falls from 103 mm to 101 mm.
The annual picture
August 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
Edison climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.7°C-4.1°C | -4.1°C | 83 | 9.2 | 9.610 h |
| February | 5.2°C-3.6°C | -3.6°C | 78 | 8.6 | 10.611 h |
| March | 9.7°C0.2°C | 0.2°C | 108 | 10.5 | 11.912 h |
| April | 16.0°C6.0°C | 6.0°C | 93 | 10.7 | 13.313 h |
| May | 21.4°C11.6°C | 11.6°C | 90 | 11.4 | 14.414 h |
| June | 26.4°C17.0°C | 17.0°C | 106 | 11.2 | 15.015 h |
| July | 29.4°C20.2°C | 20.2°C | 108 | 11.2 | 14.815 h |
| August, selected | 28.2°C19.5°C | 19.5°C | 103 | 10.2 | 13.814 h |
| September | 24.3°C15.9°C | 15.9°C | 101 | 9.1 | 12.513 h |
| October | 17.8°C9.7°C | 9.7°C | 95 | 8.6 | 11.211 h |
| November | 11.7°C3.9°C | 3.9°C | 76 | 7.8 | 10.010 h |
| December | 6.3°C-0.8°C | -0.8°C | 102 | 9.4 | 9.39 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
August in nearby cities
- Staten Island in AugustUnited States · 24 kmHigh 27.9°C · Low 19.8°C · 104 mm rain
- Newark in AugustUnited States · 31 kmHigh 28.1°C · Low 19.3°C · 102 mm rain
- New York City in AugustUnited States · 41 kmHigh 27.4°C · Low 19.2°C · 101 mm rain
- Brooklyn in AugustUnited States · 42 kmHigh 27.5°C · Low 19.7°C · 101 mm rain
- Trenton in AugustUnited States · 44 kmHigh 28.4°C · Low 19.3°C · 102 mm rain
- Passaic in AugustUnited States · 45 kmHigh 27.8°C · Low 19.1°C · 102 mm rain
- Manhattan in AugustUnited States · 48 kmHigh 27.6°C · Low 19.2°C · 101 mm rain
- Paterson in AugustUnited States · 49 kmHigh 27.9°C · Low 19.1°C · 103 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 Edison) is explained once on the Edison year overview and on the Sources, method and limits page.