Historical weather data, all-time temperature records, and monthly climate averages for Surprise, AZ. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Surprise sits right in that sweet shoulder-season window — historically mild, with an average high of 83° and virtually no chance of rain. The date has seen some wild swings, though: a scorching 98° back in 1972 and a teeth-chattering 38° low as recently as 2023.
Surprise earns its desert credentials with an all-time high of 122° recorded on June 26, 1990 — one of those days that makes car door handles a hazard. On the other end, January 3, 1970 bottomed out at 20°, proof that the desert doesn't always play nice in winter.
If you're planning a visit, spring and fall are your sweet spots — highs stay in the 70s and 80s before summer turns brutal, with average highs topping 100° from June through September. December and January are the coolest months, hovering around 64–67°, while February sees the most precipitation, making it the rare time Surprise gets anything resembling a rainy season.