Milwaukee
Wisconsin, USA
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Milwaukee, WI

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A view of the modern Milwaukee City in Wisconsin, USA, from Lake Michigan and over the pier
A view of the modern Milwaukee City in Wisconsin, USA, from Lake Michigan and over the pier
  • The average high temperature in September: 71.3°F

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (28.9°F).

  • The average low temperature in September: 54.9°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).

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  • The average humidity in September: 75.4%

The month with the highest relative humidity is December (75.9%).
Months with the lowest relative humidity are April and May (68.5%).

  • The average rainfall in September: 3.2"

The wettest month (with the highest rainfall) is August (4").
The driest month (with the lowest rainfall) is February (1.7").

  • The average rainfall days in September: 8.8 days

The month with the highest number of rainy days is April (12.1 days).
The month with the lowest number of rainy days is September (8.8 days).

  • The average snowfall in September: 0"

The month with the highest snowfall is January (14.7").
Months with the lowest snowfall are June, July, August and September (0").

  • The average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.8 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

  • The average sea temperature in September: 66.9°F

The best month for swimming (with the highest average sea temperature) is August (71.9°F).
The coldest month (with the lowest average sea temperature) is February (36°F).

  • The average daylight in September: 12h

Months with the longest days are May, June and July (Average daylight: 15h).
Months with shortest days are January and December (Average daylight: 9h).

  • The average sunshine in September: 7.2h

The month with most sunshine is July (Average sunshine: 10.4h).
The month with least sunshine is December (Average sunshine: 3.4h).

  • The average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 8).
Months with the lowest UV index are January and December (UV index 1).

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