Climate averages 1991–2020
Hartford weather
in August.
A warm, 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 warm month in Hartford: daytime highs average 27.6°C and nights cool to about 17.8°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 100 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 52 min on an average August day.
The nearest other city in this atlas is New Britain (14 km away). In August its highs average 27.5°C, about as warm as Hartford, with 100 mm of rain.
Among the 498 cities listed in the United States, Hartford ranks joint 344th of 498 for the warmest August highs and joint 399th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Hartford is 2.3°C cooler than that mean.
From August to September, average highs fall by 4.2°C to 23.4°C, and monthly rainfall falls from 100 mm to 97 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
Hartford climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.0°C-6.9°C | -6.9°C | 84 | 9.3 | 9.510 h |
| February | 3.6°C-6.1°C | -6.1°C | 76 | 8.7 | 10.611 h |
| March | 8.0°C-2.1°C | -2.1°C | 103 | 10.5 | 11.912 h |
| April | 14.7°C3.8°C | 3.8°C | 91 | 10.8 | 13.313 h |
| May | 20.4°C9.7°C | 9.7°C | 84 | 10.9 | 14.515 h |
| June | 25.4°C15.1°C | 15.1°C | 96 | 11.5 | 15.215 h |
| July | 28.6°C18.4°C | 18.4°C | 89 | 10.6 | 14.915 h |
| August, selected | 27.6°C17.8°C | 17.8°C | 100 | 10.1 | 13.914 h |
| September | 23.4°C13.9°C | 13.9°C | 97 | 8.5 | 12.513 h |
| October | 16.6°C7.7°C | 7.7°C | 103 | 9.2 | 11.111 h |
| November | 10.3°C2.0°C | 2.0°C | 84 | 8.5 | 9.910 h |
| December | 4.7°C-3.1°C | -3.1°C | 104 | 10.0 | 9.29 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
- New Britain in AugustUnited States · 14 kmHigh 27.5°C · Low 17.9°C · 100 mm rain
- Waterbury in AugustUnited States · 38 kmHigh 27.2°C · Low 18.3°C · 104 mm rain
- Springfield (Massachusetts), United States in AugustUnited States · 38 kmHigh 27.1°C · Low 17.5°C · 91 mm rain
- New Haven in AugustUnited States · 55 kmHigh 26.3°C · Low 19.6°C · 102 mm rain
- Danbury in AugustUnited States · 76 kmHigh 27.1°C · Low 18.3°C · 115 mm rain
- Bridgeport in AugustUnited States · 77 kmHigh 26.7°C · Low 19.7°C · 103 mm rain
- Worcester, United States in AugustUnited States · 92 kmHigh 26.5°C · Low 17.4°C · 97 mm rain
- Norwalk in AugustUnited States · 94 kmHigh 27.0°C · Low 19.9°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 Hartford) is explained once on the Hartford year overview and on the Sources, method and limits page.
New Britain lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.