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Surprise Weather by Month
Average temperatures, rainfall and humidity for Surprise, United States, month by month, built from OpenWeather's historical records. Use it to see what a typical Surprise month looks like before you travel — then check the live Surprise forecast for the days ahead.
Warmest month
July
42°C average high
Coolest month
January
7°C average low
Wettest month
September
45 mm of rain
Driest month
June
6 mm of rain
Average temperature and rainfall in Surprise 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 | 7°C | -7°C / 28°C | 21 mm | 50% | 8 km/h |
| February | 22°C | 9°C | -1°C / 33°C | 16 mm | 43% | 9 km/h |
| March | 26°C | 12°C | 3°C / 41°C | 24 mm | 37% | 10 km/h |
| April | 30°C | 15°C | 4°C / 39°C | 12 mm | 24% | 11 km/h |
| May | 34°C | 19°C | 7°C / 43°C | 12 mm | 22% | 11 km/h |
| June | 40°C | 24°C | 13°C / 48°C | 6 mm | 19% | 11 km/h |
| July | 42°C | 29°C | 20°C / 47°C | 26 mm | 31% | 12 km/h |
| August | 41°C | 28°C | 17°C / 47°C | 29 mm | 35% | 10 km/h |
| September | 38°C | 24°C | 11°C / 45°C | 45 mm | 35% | 9 km/h |
| October | 32°C | 17°C | 3°C / 43°C | 30 mm | 35% | 9 km/h |
| November | 25°C | 11°C | -1°C / 35°C | 15 mm | 39% | 8 km/h |
| December | 20°C | 7°C | -7°C / 28°C | 19 mm | 50% | 8 km/h |
Best time to visit Surprise
The most comfortable time to visit Surprise 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 September, totalling about 253 mm a year.
Travellers who prefer heat should aim for July, when highs average 42°C. September is the month to avoid if rain would spoil your plans — it averages 45 mm, roughly 8× the rainfall of June.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Surprise forecast for what is happening now.