Weather in Southeast Wisconsin

    Plan your Lake Geneva getaway with confidence — current conditions, seasonal expectations, and monthly climate averages.

    Monday, September 14, 2026

    Lake Geneva, Wisconsin

    62°

    Clear Sky

    64% 2 mph

    7-Day Forecast

    Today

    65°

    54°

    Mon

    72°

    49°

    Tue

    79°

    61°

    Wed

    69°

    55°

    Thu

    74°

    58°

    Fri

    78°

    58°

    Sat

    89°

    64°

    Southeast Wisconsin is characterized by a humid continental climate with distinct seasons, bringing a wide range of weather conditions throughout the year. Situated in the Midwest, this region experiences cold winters and warm, sometimes hot, summers. Precipitation, including rain and snow, is spread fairly evenly throughout the year, with some variation based on seasonal factors. Here is a breakdown of what to expect during the different times of the year in Southeast Wisconsin:

    Winter (December – February)

    Winters in Southeast Wisconsin are known for their cold temperatures and snowfall. Average temperatures in this season range from lows in the teens (Fahrenheit) to highs around the low 30s. Snow is common, with an annual average snowfall of around 45-50 inches, most of which occurs during these winter months. Snowstorms and occasional blizzards can be expected, with January typically being the snowiest month. Wind chill can make temperatures feel even colder, so it’s essential to dress appropriately and be prepared for winter driving conditions.

    Spring (March – May)

    Spring is a time of transition in Southeast Wisconsin, with temperatures and weather conditions gradually improving. March can still see snow, but as the season progresses, snow gives way to rain, and temperatures increase. Average highs range from the mid-40s in March to the upper 60s by May, with lows ranging from the upper 20s to the mid-40s. Spring can be quite rainy, with April and May being the wettest months, so it’s a good idea to carry an umbrella and be prepared for occasional storms.

    Summer (June – August)

    Summers in Southeast Wisconsin are generally warm to hot and humid, with temperatures reaching the 70s and 80s on average. Occasionally, temperatures can reach the 90s or even higher during heatwaves. Overnight lows range from the upper 50s to the mid-60s. Although rain is less frequent during the summer months, thunderstorms can develop, and rainfall can be heavy at times. Summer is an excellent time to enjoy outdoor activities, but it’s essential to stay hydrated and protect yourself from the sun.

    Fall (September – November)

    Fall in Southeast Wisconsin is marked by cooler temperatures and colorful foliage as trees begin to change colors. September can still be quite warm, but temperatures gradually decrease throughout the season, with average highs in the 60s and 50s and lows in the 40s and 30s. Rainfall is less frequent than in spring, but precipitation can still occur. Early snow is possible in late November, signaling the approach of winter.

    In summary, Southeast Wisconsin offers a diverse climate with four distinct seasons. Visitors and residents should be prepared for a wide range of temperatures and weather conditions, from cold, snowy winters to warm, humid summers, and everything in between.

    Monthly Climate Averages

    Use this chart to plan your visit. All temperatures shown in Fahrenheit and Celsius.

    January

    Avg Temp21 °F (-6 °C)Min Temp15 °F (-9.5 °C)Max Temp29 °F (-1.6 °C)Rainfall2 in (53 mm)Humidity74%Rainy Days7Sun Hours4.6

    February

    Avg Temp24 °F (-4.4 °C)Min Temp17 °F (-8.2 °C)Max Temp33 °F (0.4 °C)Rainfall2 in (51 mm)Humidity71%Rainy Days6Sun Hours5.4

    March

    Avg Temp35 °F (1.6 °C)Min Temp28 °F (-2.4 °C)Max Temp45 °F (7 °C)Rainfall3 in (64 mm)Humidity68%Rainy Days7Sun Hours7.1

    April

    Avg Temp47 °F (8.2 °C)Min Temp38 °F (3.7 °C)Max Temp57 °F (14.1 °C)Rainfall4 in (107 mm)Humidity66%Rainy Days9Sun Hours8.2

    May

    Avg Temp58 °F (14.6 °C)Min Temp50 °F (10.1 °C)Max Temp68 °F (20.2 °C)Rainfall4 in (114 mm)Humidity66%Rainy Days9Sun Hours9.5

    June

    Avg Temp68 °F (20.2 °C)Min Temp61 °F (15.9 °C)Max Temp77 °F (25.2 °C)Rainfall4 in (95 mm)Humidity69%Rainy Days9Sun Hours10.6

    July

    Avg Temp73 °F (22.9 °C)Min Temp66 °F (18.7 °C)Max Temp82 °F (27.6 °C)Rainfall4 in (93 mm)Humidity68%Rainy Days9Sun Hours9.6

    August

    Avg Temp71 °F (21.9 °C)Min Temp64 °F (18 °C)Max Temp79 °F (26.4 °C)Rainfall4 in (100 mm)Humidity71%Rainy Days8Sun Hours9.6

    September

    Avg Temp65 °F (18.4 °C)Min Temp58 °F (14.4 °C)Max Temp73 °F (22.9 °C)Rainfall3 in (79 mm)Humidity69%Rainy Days8Sun Hours8.4

    October

    Avg Temp52 °F (11.2 °C)Min Temp46 °F (7.9 °C)Max Temp60 °F (15.5 °C)Rainfall3 in (79 mm)Humidity69%Rainy Days6Sun Hours6.5

    November

    Avg Temp40 °F (4.1 °C)Min Temp34 °F (1.2 °C)Max Temp47 °F (8.1 °C)Rainfall3 in (66 mm)Humidity72%Rainy Days7Sun Hours5.6

    December

    Avg Temp27 °F (-2.8 °C)Min Temp22 °F (-5.8 °C)Max Temp34 °F (1 °C)Rainfall2 in (58 mm)Humidity74%Rainy Days6Sun Hours4.4

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