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San Tan Valley Weather by Month
Average temperatures, rainfall and humidity for San Tan Valley, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical San Tan Valley month looks like before you travel — then check the live San Tan Valley forecast for the days ahead.
Warmest month
July
41°C average high
Coolest month
January
6°C average low
Wettest month
August
37 mm of rain
Driest month
June
6 mm of rain
Average temperature and rainfall in San Tan Valley 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 | 19°C | 6°C | -9°C / 28°C | 24 mm | 49% | 9 km/h |
| February | 22°C | 8°C | -4°C / 32°C | 18 mm | 43% | 10 km/h |
| March | 26°C | 11°C | -2°C / 40°C | 14 mm | 37% | 11 km/h |
| April | 30°C | 14°C | 1°C / 39°C | 8 mm | 25% | 12 km/h |
| May | 34°C | 19°C | 3°C / 44°C | 11 mm | 22% | 12 km/h |
| June | 40°C | 24°C | 11°C / 48°C | 6 mm | 20% | 11 km/h |
| July | 41°C | 29°C | 19°C / 47°C | 21 mm | 32% | 12 km/h |
| August | 41°C | 28°C | 15°C / 47°C | 37 mm | 37% | 11 km/h |
| September | 37°C | 24°C | 9°C / 45°C | 23 mm | 37% | 11 km/h |
| October | 31°C | 17°C | 1°C / 43°C | 18 mm | 36% | 9 km/h |
| November | 25°C | 11°C | -4°C / 36°C | 16 mm | 40% | 9 km/h |
| December | 20°C | 7°C | -9°C / 28°C | 36 mm | 50% | 8 km/h |
Best time to visit San Tan Valley
The most comfortable time to visit San Tan Valley is generally February to March and November, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around August, totalling about 233 mm a year.
Travellers who prefer heat should aim for July, when highs average 41°C. August is the month to avoid if rain would spoil your plans — it averages 37 mm, roughly 6× the rainfall of the driest month (June).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the San Tan Valley forecast for what is happening now.