Surprise Climate by Month
Surprise, Arizona, United States
Very hot summers and cool winters, with little rain.
The climate in Surprise is one of very hot summers and cool winters, with little rain. Afternoon highs range from 68°F (20°C) in December to 108°F (42°C) in July, and December nights average 40°F (5°C). It gets only 7.4 in (188 mm) of rain a year. April to June are almost completely dry. The air is dry, averaging 31% relative humidity.
- Warmest month
- 108°F(42°C)
- Average high, July
- Coldest nights
- 40°F(5°C)
- Average low, December
- Rain per year
- 7.4 in(188 mm)
- No clear rainy season
- Humidity
- 31%
- Sunniest: June
Best and worst months in Surprise
Best for weatherThe most comfortable weather comes in February, March and November, with highs around 77°F (25°C) and about 0.8 in (20 mm) of rain a month.
Least pleasantJuly and August are the least pleasant; July is the hottest, with highs of 108°F (42°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in February.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Surprise weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 69°F(21°C) | 42°F(6°C) | 0.8 in(20 mm) | 40% | 3.1 |
| FebFebruaryBest | 73°F(23°C) | 44°F(7°C) | 0.9 in(24 mm) | 42% | 3.9 |
| MarMarchBest | 79°F(26°C) | 49°F(10°C) | 0.8 in(20 mm) | 34% | 5.4 |
| AprApril | 87°F(31°C) | 55°F(13°C) | 0.2 in(5 mm) | 23% | 6.7 |
| MayMay | 96°F(36°C) | 64°F(18°C) | 0.1 in(3 mm) | 20% | 7.7 |
| JunJune | 106°F(41°C) | 73°F(23°C) | 0.1 in(2 mm) | 17% | 8.1 |
| JulJuly | 108°F(42°C) | 79°F(26°C) | 0.8 in(20 mm) | 28% | 7.2 |
| AugAugust | 107°F(41°C) | 79°F(26°C) | 0.9 in(24 mm) | 32% | 6.4 |
| SepSeptember | 102°F(39°C) | 72°F(22°C) | 0.7 in(17 mm) | 30% | 5.8 |
| OctOctober | 91°F(33°C) | 60°F(15°C) | 0.6 in(14 mm) | 30% | 4.8 |
| NovNovemberBest | 78°F(26°C) | 48°F(9°C) | 0.6 in(15 mm) | 36% | 3.5 |
| DecDecember | 68°F(20°C) | 40°F(5°C) | 0.9 in(24 mm) | 42% | 2.9 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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