Climate averages 1991–2020
Waterbury 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 Waterbury: daytime highs average 27.2°C and nights cool to about 18.3°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 104 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 51 min on an average August day.
The nearest other city in this atlas is New Britain (25 km away). In August its highs average 27.5°C, about as warm as Waterbury, with 100 mm of rain.
Among the 498 cities listed in the United States, Waterbury ranks joint 369th of 498 for the warmest August highs and joint 425th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Waterbury is 2.7°C cooler than that mean.
From August to September, average highs fall by 4.1°C to 23.2°C, and monthly rainfall falls from 104 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
Waterbury climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.1°C-5.9°C | -5.9°C | 88 | 9.5 | 9.510 h |
| February | 3.5°C-5.2°C | -5.2°C | 78 | 8.7 | 10.611 h |
| March | 7.8°C-1.4°C | -1.4°C | 106 | 10.7 | 11.912 h |
| April | 14.4°C4.4°C | 4.4°C | 97 | 11.2 | 13.313 h |
| May | 20.0°C10.3°C | 10.3°C | 87 | 11.4 | 14.514 h |
| June | 25.1°C15.6°C | 15.6°C | 100 | 11.2 | 15.115 h |
| July | 28.2°C18.9°C | 18.9°C | 90 | 10.9 | 14.915 h |
| August, selected | 27.2°C18.3°C | 18.3°C | 104 | 10.2 | 13.814 h |
| September | 23.2°C14.6°C | 14.6°C | 101 | 9.1 | 12.513 h |
| October | 16.5°C8.6°C | 8.6°C | 106 | 9.1 | 11.111 h |
| November | 10.3°C2.9°C | 2.9°C | 88 | 8.5 | 9.910 h |
| December | 4.8°C-2.1°C | -2.1°C | 107 | 10.1 | 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 · 25 kmHigh 27.5°C · Low 17.9°C · 100 mm rain
- New Haven in AugustUnited States · 30 kmHigh 26.3°C · Low 19.6°C · 102 mm rain
- Hartford in AugustUnited States · 38 kmHigh 27.6°C · Low 17.8°C · 100 mm rain
- Danbury in AugustUnited States · 38 kmHigh 27.1°C · Low 18.3°C · 115 mm rain
- Bridgeport in AugustUnited States · 44 kmHigh 26.7°C · Low 19.7°C · 103 mm rain
- Norwalk in AugustUnited States · 57 kmHigh 27.0°C · Low 19.9°C · 103 mm rain
- Stamford in AugustUnited States · 69 kmHigh 27.2°C · Low 19.9°C · 103 mm rain
- Springfield (Massachusetts), United States in AugustUnited States · 72 kmHigh 27.1°C · Low 17.5°C · 91 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 Waterbury) is explained once on the Waterbury year overview and on the Sources, method and limits page.