Surprise, Arizona Weather
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Climate of Surprise: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Surprise, with average daytime highs around 42°C. December is the coolest, when nights typically fall to about 5°C. That is a wide yearly range of roughly 37°C, so the seasons feel very different from each other.
The area receives about 190 mm of rain in a typical year. Rainfall is modest in every month; August is the wettest at about 28 mm. The driest stretch is March to June and September to November, with under 20 mm a month.
For outdoor plans and travel, January to April and October to November usually offer the most comfortable weather in Surprise, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 19° | 5° | 24 mm | 44% |
| Feb | 21° | 6° | 24 mm | 41% |
| Mar | 25° | 10° | 16 mm | 36% |
| Apr | 30° | 13° | 5 mm | 27% |
| May | 35° | 18° | 3 mm | 21% |
| Jun | 41° | 24° | 1 mm | 15% |
| Jul | 42° | 28° | 24 mm | 28% |
| Aug | 40° | 27° | 28 mm | 32% |
| Sep | 38° | 23° | 17 mm | 29% |
| Oct | 31° | 17° | 13 mm | 29% |
| Nov | 24° | 10° | 16 mm | 33% |
| Dec | 18° | 5° | 21 mm | 43% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Surprise. Values describe typical conditions, not a forecast.
About Surprise weather
Surprise, in Arizona's mostly desert climate, with cooler high country in the north, is positioned about 31 km north-west of Phoenix. The warmer months mean extremely hot summers (May–September) with highs regularly above 40°C in the low deserts. Finally, there's mild, dry winters in the desert, cold with snow in the northern highlands. This page shows live, auto-refreshing weather for Surprise: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Phoenix.
Frequently asked questions
Surprise is about 31 km north-west of Phoenix, in Arizona.
Surprise sees mild, dry winters in the desert, cold with snow in the northern highlands.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Surprise's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Surprise, with average daytime highs of about 42°C and nights around 28°C. Afternoons above 40°C are common then, so heatwave precautions matter.
The coldest nights come in December, when the average low is about 5°C and daytime highs reach around 18°C.
Surprise receives about 190 mm of rain in a typical year. August is the wettest month at roughly 28 mm; no month averages more than 100 mm.
January to April and October to November usually offer the most comfortable weather in Surprise, with mild daytime temperatures and little rain.
In November Surprise typically sees daytime highs near 24°C and lows near 10°C, with about 16 mm of rain over the month and average humidity around 33%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Surprise updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Surprise's day-to-day weather follows the broader pattern of Arizona described above. See the hourly weather forecast or the air quality index for more detail.