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Fairfield Weather by Month
Average temperatures, rainfall and humidity for Fairfield, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Fairfield month looks like before you travel — then check the live Fairfield forecast for the days ahead.
Warmest month
August
31°C average high
Coolest month
December
6°C average low
Wettest month
December
91 mm of rain
Driest month
August
6 mm of rain
Average temperature and rainfall in Fairfield 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 | 15°C | 6°C | -5°C / 25°C | 72 mm | 78% | 10 km/h |
| February | 17°C | 6°C | -1°C / 26°C | 71 mm | 72% | 12 km/h |
| March | 20°C | 8°C | 1°C / 32°C | 63 mm | 72% | 13 km/h |
| April | 23°C | 10°C | 1°C / 32°C | 34 mm | 67% | 15 km/h |
| May | 26°C | 12°C | 5°C / 39°C | 21 mm | 62% | 18 km/h |
| June | 30°C | 14°C | 9°C / 41°C | 19 mm | 59% | 18 km/h |
| July | 31°C | 15°C | 11°C / 42°C | 9 mm | 60% | 20 km/h |
| August | 31°C | 15°C | 11°C / 42°C | 6 mm | 61% | 17 km/h |
| September | 30°C | 14°C | 5°C / 44°C | 9 mm | 59% | 15 km/h |
| October | 26°C | 11°C | 3°C / 40°C | 21 mm | 59% | 12 km/h |
| November | 19°C | 8°C | -2°C / 29°C | 45 mm | 70% | 10 km/h |
| December | 15°C | 6°C | -4°C / 26°C | 91 mm | 78% | 10 km/h |
Best time to visit Fairfield
The most comfortable time to visit Fairfield is generally April to May and October, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around December, totalling about 461 mm a year.
Travellers who prefer heat should aim for August, when highs average 31°C. December is the month to avoid if rain would spoil your plans — it averages 91 mm, roughly 14× the rainfall of the driest month (August).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Fairfield forecast for what is happening now.