Grafton (WI) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Grafton.
Climate overview of Grafton
Temperatures in Grafton, Wisconsin, United States of America, vary greatly throughout the year. July is the hottest month at 27°C (81°F), while January is the coldest at -2°C (28°F).
With around 964 mm (38 in) of annual rain/snowfall, the city has moderate precipitation levels. April is the wettest month and January the driest. It also has warm summers and very cold winters. July is the sunniest month, averaging 11.0 hours of sunshine per day.
Grafton Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Grafton - and find the best time to visit.
Monthly Temperature in Grafton
The climate in Grafton is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 27°C (81°F) in July to a very cold -2°C (28°F) in the coolest month, January.
Nights vary from 16°C (61°F) in July to around -10°C (14°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Grafton
Generally, Grafton receives mid-range precipitation levels, with 964 mm (38 in) annually. The climate in Grafton shows significant variation throughout the year. Expect high rainfall in April, the wettest month, with an average of 128 mm (5 in) of precipitation over 13 rainy days.
In contrast, the driest month January offers drier and sunnier days, with around 38 mm (1.5 in) of snowfall over 10 snowy days. For more details, please visit our Grafton Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Grafton
For those who appreciate different seasons, Grafton serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 11.0 hours of sunshine daily, and embrace the darker days in January, offering only 4.0 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit Grafton
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July, August and September
- Warmest weather: July and August
- Most sunshine: July
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -10°C (14°F).
Frequently asked questions about the climate in Grafton
What is the best time to visit Grafton?
July, August and September typically offer the most optimal weather in Grafton. In contrast, January, February, March, April, November and December tend to have less optimal conditions. Grafton has warm summers and very cold winters.
What temperatures can I expect in Grafton?
Daytime highs range from -2°C (28°F) in January to 27°C (81°F) in July. Nighttime lows range from -10°C (14°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does Grafton get?
Annual rainfall is around 964 mm (38 in). April is the wettest month with 128 mm (5 in), while January is the driest with 38 mm (1.5 in).
How sunny is Grafton?
Grafton receives around 2,560 hours of sunshine per year. July is the sunniest month with 330 hours, while January is the cloudiest with just 120 hours. Overall, Grafton enjoys abundant sunshine.
Grafton 3-Day Forecast
Grafton on the map
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