Wauwatosa (WI) Temperature by Month

The average annual maximum temperature in Wauwatosa, Wisconsin, United States of America is 14°C (57°F), with daytime highs ranging from -1°C (30°F) in January to 28°C (82°F) in July. This page covers monthly averages, day-night differences, and how Wauwatosa compares to cities worldwide.

Depending on the time of the year, temperatures range from warm to very cold in Wauwatosa. Nighttime lows follow the same pattern, ranging from 17°C (63°F) to -10°C (14°F).

The chart below illustrates the average maximum day and minimum night temperatures in Wauwatosa by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. July, the warmest month, sees 319 hours of sunshine.

The chart below shows the average temperature throughout the year:

Wauwatosa's average annual maximum temperature is 14°C (57°F). To put that in context, here's how it compares to a few well-known destinations:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.

Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

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 the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Wauwatosa, January is the coolest month, with average highs of -1°C (30°F) and humidity around 72%, considered high. In July, the warmest month, temperatures average 28°C (82°F) with 71% humidity, conditions that feel high. 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.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Wauwatosa this rarely lasts long on the ground.

For more on Wauwatosa's weather, including monthly rainfall, sunshine hours, and humidity, visit our Wauwatosa climate page.