Wisconsin

Wisconsin Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Wisconsin, the United States of America in September.

Considering a trip to Wisconsin, the United States of America this September and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:

What to Expect in Wisconsin in September

Wisconsin, the United States of America is a region in the United States of America. September in Wisconsin generally has temperatures that range from pleasant to warm, with precipitation levels ranging from moderate to high.

Temperatures

Based on our climate data spanning from 1990-2020, the average maximum temperature is pleasant in Minocqua at 20°C (68°F) to warm in Prairie du Chien at 24°C (75°F). Nighttime temperatures generally drop to 11°C (52°F) in Prairie du Chien and 7°C (45°F) in Minocqua.

For a closer look at conditions across Wisconsin, the United States of America, refer to the map below.

Precipitation

In September, precipitation varies across different areas. From moderate rainfall in Manitowoc with an average of 63 mm (2.5 in) to high rainfall in Chippewa Falls with 108 mm (4.3 in).

Average sunshine

Most destinations offer generous amounts of sunshine this September. For example, Lake Geneva gets approximately 216 hours of sunlight, perfect for anyone wanting bright, sunny days.

Explore Wisconsin by month

Pick a month to see the average temperature, rainfall and sunshine in Wisconsin - and find the best time to visit. (based on Lake Geneva)

Best Places to Visit in Wisconsin in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Wisconsin.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Wisconsin

What is the weather like in September for some of the most popular destinations in Wisconsin, the United States of America?

Temperature range in Wisconsin (September)

Precipitation variation in Wisconsin (September)

Lake Geneva

In September Lake Geneva generally has high temperatures with maximum daytime temperatures around 23°C (73°F), minimum nighttime temperatures around 11°C (52°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

August
September
October
Max temperature
27°C (81°F)
23°C (73°F)
16°C (61°F)
Min temperature
15°C (59°F)
11°C (52°F)
4°C (39°F)
Monthly sun hours
282 hours
216 hours
181 hours
Monthly rainfall
103 mm (4.1 in)
85 mm (3.3 in)
75 mm (3 in)
Monthly rainy days
11 days
10 days
11 days
Weather conditions

Brookfield

In September Brookfield generally has high temperatures with maximum daytime temperatures around 23°C (73°F), minimum nighttime temperatures around 11°C (52°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

August
September
October
Max temperature
27°C (81°F)
23°C (73°F)
16°C (61°F)
Min temperature
16°C (61°F)
11°C (52°F)
5°C (41°F)
Monthly sun hours
282 hours
216 hours
181 hours
Monthly rainfall
91 mm (3.6 in)
84 mm (3.3 in)
72 mm (2.8 in)
Monthly rainy days
10 days
10 days
12 days
Weather conditions

Oak Creek

In September Oak Creek generally has high temperatures with maximum daytime temperatures around 23°C (73°F), minimum nighttime temperatures around 13°C (55°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

August
September
October
Max temperature
26°C (79°F)
23°C (73°F)
16°C (61°F)
Min temperature
18°C (64°F)
13°C (55°F)
6°C (43°F)
Monthly sun hours
282 hours
216 hours
181 hours
Monthly rainfall
91 mm (3.6 in)
75 mm (3 in)
78 mm (3.1 in)
Monthly rainy days
11 days
10 days
11 days
Weather conditions

Pleasant Prairie

In September Pleasant Prairie generally has high temperatures with maximum daytime temperatures around 23°C (73°F), minimum nighttime temperatures around 12°C (54°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

August
September
October
Max temperature
27°C (81°F)
23°C (73°F)
16°C (61°F)
Min temperature
16°C (61°F)
12°C (54°F)
5°C (41°F)
Monthly sun hours
282 hours
216 hours
181 hours
Monthly rainfall
88 mm (3.5 in)
89 mm (3.5 in)
76 mm (3 in)
Monthly rainy days
11 days
10 days
12 days
Weather conditions

Janesville

In September Janesville generally has high temperatures with maximum daytime temperatures around 24°C (75°F), minimum nighttime temperatures around 11°C (52°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

August
September
October
Max temperature
27°C (81°F)
24°C (75°F)
16°C (61°F)
Min temperature
16°C (61°F)
11°C (52°F)
4°C (39°F)
Monthly sun hours
272 hours
212 hours
175 hours
Monthly rainfall
136 mm (5.4 in)
79 mm (3.1 in)
76 mm (3 in)
Monthly rainy days
11 days
9 days
10 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Wisconsin, in the United States of America.

Popular cities in September

Day & night temperatures, rainfall and average weather in Wisconsin in September.

City Weather Day temp Night temp Rainfall
Lake Geneva 23°C (73°F) 11°C (52°F) 85 mm (3.3 in)
Brookfield 23°C (73°F) 11°C (52°F) 84 mm (3.3 in)
Oak Creek 23°C (73°F) 13°C (55°F) 75 mm (3 in)
Pleasant Prairie 23°C (73°F) 12°C (54°F) 89 mm (3.5 in)
Janesville 24°C (75°F) 11°C (52°F) 79 mm (3.1 in)
Racine 22°C (72°F) 14°C (57°F) 72 mm (2.8 in)

Wisconsin weather in September: frequently asked questions

What is the weather like in Wisconsin, the United States of America in September?

In September, Wisconsin, the United States of America generally has excellent weather conditions. Lake Geneva sees daytime temperatures near 23°C (73°F), with nights cooling to roughly 11°C (52°F).

What is the average temperature in Wisconsin, the United States of America in September?

Daytime temperatures in Lake Geneva peak at roughly 23°C (73°F) in September, dropping to about 11°C (52°F) overnight.

Does Wisconsin, the United States of America get a lot of rain in September?

Not particularly. Lake Geneva averages just 85 mm (3.3 in) of rain in September, making it a mostly dry month for Wisconsin, the United States of America.

Is September a Good Time to Visit Wisconsin, the United States of America?

We consider September to be one of the best times to travel to Wisconsin, the United States of America. Typically, the climate in Lake Geneva is excellent.

Generally speaking, May, July and September provide excellent weather in Lake Geneva. On the other hand, the weather in January, February, March, November and December tend to be less favorable.

Interested in more climate information?

We have much more information about the climate in Wisconsin.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.