Ann Arbor, MI Weather
Ann Arbor hourly forecast: next 24 hours
Today's high of 71°F (22°C) is about 3°F (2°C) below the typical September high of 74°F (24°C).
Current conditions in detail
Ann Arbor weather tomorrow (Thursday, September 17)
Tomorrow in Ann Arbor looks patchy rain nearby, with a high of 74° and an overnight low of 63°. There is a 72% chance of rain - plan accordingly. Winds top out near 8 mph, and the UV index reaches 5 (moderate).
Ann Arbor 14-day forecast
About the weather in Ann Arbor
A 26°C spread between its warmest and coolest months puts Ann Arbor among the more strongly seasonal places we cover. July averages 82°F (28°C) by day; January averages 32°F (0°C), with nights at 19°F (-7°C).
Ann Arbor weather: quick facts
- Hottest month: July - highs near 82°F (28°C)
- Coldest month: January - highs near 32°F (0°C)
- Decade extremes (2015-2024): 94°F (34°C) high · -25°F (-32°C) low
- Wettest month: July (12 rainy days) · Sunniest: July (12.2 h sun/day)
- Climate type: humid continental
- Annual swing: 26°C between the average warmest and coolest month · day to night: 9°C
- Snow: about 19 days a year
- Months with freezing average lows: 4
- Average humidity: 71%
Temperatures through the year
July is the warm end of the year, averaging 82°F (28°C) by day and 64°F (18°C) overnight. January bottoms out at 32°F (0°C) in daylight, 19°F (-7°C) after dark. The gridded 2015-2024 daily record for this location tops out at 94°F (34°C) and bottoms at -25°F (-32°C) - decade extremes, not all-time station records. The wettest month is July (3.6 inches (91 mm) across 12 days) and the driest November.
Rain, sun and snow
July is the brightest month at 12.2 hours of sun a day, against an annual average of 8.2 - duller than about 78% of the cities we track. Between the average July and the average January lie 26°C, a wider spread than roughly 88% of the cities we track.
Season by season
Spring (March through May)
Spring in Ann Arbor is mild, with daytime highs averaging 57°F (14°C) and nights around 38°F (4°C); rain falls on around 36 of the 90 days, plus about 5 snowy days.
Summer (June through August)
Summer in Ann Arbor settles into easy warmth, with daytime highs averaging 80°F (27°C) and nights around 62°F (17°C); rain falls on around 34 of the 90 days. Daylight is generous - around 11.8 hours of sun a day.
Fall (September through November)
Fall in Ann Arbor is crisp but comfortable, with daytime highs averaging 61°F (16°C) and nights around 46°F (8°C); expect showers on roughly 30 days across the season, plus about 2 snowy days.
Winter (December through February)
Winter in Ann Arbor is frigid, with daytime highs averaging 36°F (2°C) and nights around 22°F (-6°C); expect showers on roughly 30 days across the season, plus about 12 snowy days. Wind sharpens cold like this considerably; pair the forecast winds with the wind speed converter to judge exposed conditions.
Average temperatures in Ann Arbor by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 32° | 19° | 10 | 2.5 in | 4.4 h/day | 75% |
| February | 36° | 19° | 9 | 2.5 in | 6.5 h/day | 73% |
| March | 46° | 28° | 10 | 3.2 in | 7.5 h/day | 67% |
| April | 56° | 37° | 13 | 3.4 in | 8.6 h/day | 67% |
| May | 69° | 50° | 12 | 3.6 in | 10.1 h/day | 68% |
| June | 78° | 59° | 12 | 3.5 in | 12.0 h/day | 66% |
| July | 82° | 64° | 12 | 3.6 in | 12.2 h/day | 70% |
| August | 80° | 63° | 11 | 3.5 in | 11.2 h/day | 72% |
| September | 74° | 58° | 9 | 2.9 in | 9.4 h/day | 74% |
| October | 61° | 46° | 11 | 3.4 in | 7.1 h/day | 73% |
| November | 47° | 34° | 9 | 2.3 in | 5.8 h/day | 73% |
| December | 39° | 27° | 10 | 2.5 in | 4.1 h/day | 77% |