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Waterbury Weather by Month
Average temperatures, rainfall and humidity for Waterbury, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Waterbury month looks like before you travel — then check the live Waterbury forecast for the days ahead.
Warmest month
July
29°C average high
Coolest month
January
-5°C average low
Wettest month
October
94 mm of rain
Driest month
February
40 mm of rain
Average temperature and rainfall in Waterbury by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 3°C | -5°C | -22°C / 18°C | 51 mm | 69% | 12 km/h |
| February | 4°C | -4°C | -22°C / 21°C | 40 mm | 68% | 12 km/h |
| March | 9°C | 0°C | -15°C / 24°C | 57 mm | 64% | 13 km/h |
| April | 15°C | 5°C | -6°C / 33°C | 79 mm | 64% | 13 km/h |
| May | 21°C | 10°C | 0°C / 34°C | 88 mm | 69% | 11 km/h |
| June | 26°C | 15°C | 5°C / 37°C | 89 mm | 73% | 9 km/h |
| July | 29°C | 19°C | 11°C / 38°C | 85 mm | 75% | 9 km/h |
| August | 27°C | 18°C | 9°C / 35°C | 79 mm | 76% | 8 km/h |
| September | 24°C | 14°C | 3°C / 34°C | 70 mm | 77% | 9 km/h |
| October | 18°C | 9°C | -5°C / 29°C | 94 mm | 76% | 10 km/h |
| November | 11°C | 2°C | -13°C / 26°C | 54 mm | 69% | 11 km/h |
| December | 6°C | -1°C | -15°C / 19°C | 84 mm | 73% | 11 km/h |
Best time to visit Waterbury
The most comfortable time to visit Waterbury is generally May to June and September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around October, totalling about 869 mm a year.
Travellers who prefer heat should aim for July, when highs average 29°C. October is the month to avoid if rain would spoil your plans — it averages 94 mm, roughly 2× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Waterbury forecast for what is happening now.