Surprise (AZ) Temperature by Month
Surprise, Arizona, United States of America has an average annual maximum temperature of 30°C (86°F), ranging from 18°C (64°F) in December to 41°C (106°F) in July. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Surprise Monthly Temperatures
The climate in Surprise is dynamic, ranging widely from moderate in winter to very hot in summer. Nights are significantly colder, with lows dropping from 28°C (82°F) in July to 5°C (41°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Surprise by month:
From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. July, the warmest month, averages 378 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Surprise vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Surprise vs World: Temperature Compared
Surprise's average annual maximum temperature is 30°C (86°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.
Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
What Does the Temperature Feel Like in Surprise?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In Surprise, December is the coolest month, with average highs of 18°C (64°F) and humidity around 51% — considered moderate. In July, the warmest month, temperatures average 41°C (106°F) with 31% humidity — conditions that feel low. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Surprise's weather — including monthly rainfall, sunshine hours, and humidity — visit our Surprise climate page.
