Ann Arbor (MI) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Ann Arbor.
Climate overview of Ann Arbor
The climate in Ann Arbor, Michigan, United States of America, is marked by large temperature swings across the seasons, ranging from 29°C (84°F) in July to 0°C (32°F) in January.
Annual rain/snowfall is moderate at around 938 mm (37 in), with June being the wettest month. The city also has warm summers and very cold winters. July is the sunniest month, averaging 10.6 hours of sunshine per day.
Ann Arbor Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Ann Arbor - and find the best time to visit.
Monthly Temperature in Ann Arbor
In Ann Arbor, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a comfortable 29°C (84°F) in July. In January, the coolest month of the year, temperatures drop to a very cold 0°C (32°F).
At night, temperatures range from around 16°C (61°F) in July to -9°C (16°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Ann Arbor
On average, Ann Arbor receives a reasonable amount of rain/snowfall, with an annual precipitation of 938 mm (37 in). Ann Arbor experiences moderate seasonal variation in rainfall, with monthly averages ranging from 110 mm (4.3 in) in June, the wettest month, and 63 mm (2.5 in) in November, the driest month. For more details, please visit our Ann Arbor 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 Ann Arbor
Ann Arbor can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.6 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 2.8 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Ann Arbor by Month
The relative humidity is high throughout the year in Ann Arbor.
The city experiences its highest humidity in January, reaching 74%. In May, the humidity drops to its lowest level at 65%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Ann Arbor
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, 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 -9°C (16°F).
Frequently asked questions about the climate in Ann Arbor
What is the best time to visit Ann Arbor?
May, July, August and September typically offer the most optimal weather in Ann Arbor. In contrast, January, February, March, November and December tend to have less optimal conditions. Ann Arbor has warm summers and very cold winters.
What temperatures can I expect in Ann Arbor?
Daytime highs range from 0°C (32°F) in January to 29°C (84°F) in July. Nighttime lows range from -9°C (16°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does Ann Arbor get?
Annual rainfall is around 938 mm (37 in). June is the wettest month with 110 mm (4.3 in), while November is the driest with 63 mm (2.5 in).
How sunny is Ann Arbor?
Ann Arbor receives around 2,451 hours of sunshine per year. July is the sunniest month with 319 hours, while December is the cloudiest with just 85 hours. Overall, Ann Arbor enjoys abundant sunshine.
Ann Arbor 3-Day Forecast
Ann Arbor (MI) 3-Day Forecast
Ann Arbor on the map
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