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South Lyon Weather by Month
Average temperatures, rainfall and humidity for South Lyon, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical South Lyon month looks like before you travel — then check the live South Lyon forecast for the days ahead.
Warmest month
July
28°C average high
Coolest month
January
-7°C average low
Wettest month
January
175 mm of rain
Driest month
February
46 mm of rain
Average temperature and rainfall in South Lyon 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 | 0°C | -7°C | -28°C / 15°C | 175 mm | 78% | 15 km/h |
| February | 2°C | -7°C | -31°C / 22°C | 46 mm | 76% | 15 km/h |
| March | 8°C | -2°C | -23°C / 24°C | 48 mm | 69% | 16 km/h |
| April | 15°C | 4°C | -8°C / 28°C | 79 mm | 65% | 16 km/h |
| May | 22°C | 10°C | -3°C / 34°C | 84 mm | 66% | 13 km/h |
| June | 26°C | 15°C | 4°C / 34°C | 114 mm | 70% | 11 km/h |
| July | 28°C | 17°C | 9°C / 35°C | 68 mm | 73% | 10 km/h |
| August | 27°C | 17°C | 6°C / 34°C | 74 mm | 75% | 10 km/h |
| September | 24°C | 13°C | 2°C / 34°C | 84 mm | 75% | 10 km/h |
| October | 17°C | 7°C | -4°C / 30°C | 83 mm | 75% | 13 km/h |
| November | 9°C | 1°C | -14°C / 26°C | 48 mm | 74% | 14 km/h |
| December | 3°C | -3°C | -21°C / 17°C | 115 mm | 78% | 14 km/h |
Best time to visit South Lyon
The most comfortable time to visit South Lyon is generally May and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around January, totalling about 1,020 mm a year.
Travellers who prefer heat should aim for July, when highs average 28°C. January is the month to avoid if rain would spoil your plans — it averages 175 mm, roughly 4× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the South Lyon forecast for what is happening now.