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Lewisville Weather by Month
Average temperatures, rainfall and humidity for Lewisville, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Lewisville month looks like before you travel — then check the live Lewisville forecast for the days ahead.
Warmest month
August
36°C average high
Coolest month
January
3°C average low
Wettest month
May
142 mm of rain
Driest month
July
46 mm of rain
Average temperature and rainfall in Lewisville 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 | 14°C | 3°C | -12°C / 28°C | 50 mm | 63% | 15 km/h |
| February | 17°C | 6°C | -17°C / 33°C | 52 mm | 65% | 16 km/h |
| March | 22°C | 11°C | -12°C / 34°C | 69 mm | 61% | 18 km/h |
| April | 25°C | 14°C | 1°C / 35°C | 79 mm | 63% | 19 km/h |
| May | 29°C | 19°C | 3°C / 36°C | 142 mm | 67% | 17 km/h |
| June | 33°C | 23°C | 16°C / 40°C | 82 mm | 65% | 15 km/h |
| July | 36°C | 25°C | 18°C / 43°C | 46 mm | 60% | 14 km/h |
| August | 36°C | 25°C | 18°C / 43°C | 53 mm | 58% | 13 km/h |
| September | 32°C | 22°C | 12°C / 43°C | 73 mm | 62% | 13 km/h |
| October | 27°C | 16°C | -1°C / 36°C | 107 mm | 62% | 14 km/h |
| November | 20°C | 9°C | -6°C / 33°C | 63 mm | 66% | 14 km/h |
| December | 16°C | 6°C | -12°C / 30°C | 102 mm | 67% | 14 km/h |
Best time to visit Lewisville
The most comfortable time to visit Lewisville is generally March to April and November, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around May, totalling about 917 mm a year.
Travellers who prefer heat should aim for August, when highs average 36°C. May is the month to avoid if rain would spoil your plans — it averages 142 mm, roughly 3× the rainfall of the driest month (July).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Lewisville forecast for what is happening now.