Climate averages 1991–2020
Waukesha weather
in May.
A mild, wet month: the 5th warmest and the joint 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Waukesha: daytime highs average 18.9°C and nights cool to about 9.5°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 95 mm of rain on roughly 12 days, which makes May a wet month (the joint 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 38 min on an average May day.
The nearest other city in this atlas is Milwaukee (27 km away). In May its highs average 14.4°C, 4.5°C cooler than Waukesha, with 91 mm of rain.
Among the 498 cities listed in the United States, Waukesha ranks joint 449th of 498 for the warmest May highs and joint 330th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Waukesha is 4.9°C cooler than that mean.
From May to June, average highs rise by 5.6°C to 24.5°C, and monthly rainfall stays at 95 mm.
The annual picture
May in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Waukesha climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -2.2°C-10.0°C | -10.0°C | 46 | 8.3 | 9.49 h |
| February | -0.3°C-8.6°C | -8.6°C | 45 | 7.1 | 10.510 h |
| March | 5.8°C-3.1°C | -3.1°C | 59 | 9.3 | 11.912 h |
| April | 12.3°C3.1°C | 3.1°C | 102 | 12.0 | 13.413 h |
| May, selected | 18.9°C9.5°C | 9.5°C | 95 | 11.7 | 14.615 h |
| June | 24.5°C15.5°C | 15.5°C | 95 | 11.2 | 15.315 h |
| July | 27.0°C18.6°C | 18.6°C | 86 | 10.0 | 15.015 h |
| August | 25.9°C18.1°C | 18.1°C | 90 | 10.3 | 13.914 h |
| September | 22.0°C14.2°C | 14.2°C | 75 | 8.6 | 12.513 h |
| October | 14.9°C7.6°C | 7.6°C | 72 | 8.8 | 11.111 h |
| November | 7.1°C0.6°C | 0.6°C | 55 | 8.1 | 9.810 h |
| December | 0.8°C-5.7°C | -5.7°C | 50 | 7.9 | 9.19 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Milwaukee in MayUnited States · 27 kmHigh 14.4°C · Low 9.4°C · 91 mm rain
- Racine in MayUnited States · 48 kmHigh 13.8°C · Low 9.6°C · 90 mm rain
- Kenosha in MayUnited States · 58 kmHigh 13.9°C · Low 9.7°C · 96 mm rain
- Waukegan in MayUnited States · 79 kmHigh 14.5°C · Low 10.1°C · 105 mm rain
- Madison in MayUnited States · 95 kmHigh 19.8°C · Low 9.6°C · 101 mm rain
- Arlington Heights in MayUnited States · 105 kmHigh 19.2°C · Low 10.4°C · 110 mm rain
- Elgin in MayUnited States · 108 kmHigh 20.6°C · Low 10.4°C · 118 mm rain
- Rockford in MayUnited States · 108 kmHigh 20.4°C · Low 10.3°C · 110 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Waukesha) is explained once on the Waukesha year overview and on the Sources, method and limits page.