Ann Arbor Climate by Month
Ann Arbor, Michigan, United States
Warm summers and freezing winters, with rain spread through the year.
Warm summers and freezing winters, with rain spread through the year: that's Ann Arbor's climate in short. July is the warmest month, with highs around 83°F (29°C); January is the coolest at 32°F (0°C), and nights dip to 18°F (-8°C). About 34 in (862 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 83°F(29°C)
- Average high, July
- Coldest nights
- 18°F(-8°C)
- Average low, January
- Rain per year
- 34 in(862 mm)
- No clear rainy season
- Humidity
- 70%
- Sunniest: July
Best and worst months in Ann Arbor
Best for weatherSeptember is the best time for weather in Ann Arbor: highs near 75°F (24°C) and about 3.0 in (77 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 32°F (0°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Ann Arbor weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 32°F(0°C) | 18°F(-8°C) | 2.2 in(57 mm) | 88% | 1.4 |
| FebFebruary | 35°F(2°C) | 19°F(-7°C) | 2.0 in(52 mm) | 80% | 2.3 |
| MarMarch | 46°F(8°C) | 27°F(-3°C) | 2.4 in(60 mm) | 69% | 3.5 |
| AprApril | 59°F(15°C) | 37°F(3°C) | 3.4 in(87 mm) | 61% | 4.4 |
| MayMay | 71°F(22°C) | 49°F(10°C) | 3.4 in(86 mm) | 62% | 5.1 |
| JunJune | 80°F(27°C) | 58°F(15°C) | 3.7 in(94 mm) | 66% | 5.8 |
| JulJuly | 83°F(29°C) | 62°F(17°C) | 3.1 in(79 mm) | 69% | 5.9 |
| AugAugust | 82°F(28°C) | 61°F(16°C) | 3.2 in(81 mm) | 69% | 5.0 |
| SepSeptemberBest | 75°F(24°C) | 53°F(12°C) | 3.0 in(77 mm) | 69% | 4.2 |
| OctOctober | 62°F(17°C) | 42°F(6°C) | 2.5 in(64 mm) | 68% | 2.6 |
| NovNovember | 48°F(9°C) | 32°F(0°C) | 2.6 in(65 mm) | 71% | 1.6 |
| DecDecember | 36°F(2°C) | 23°F(-5°C) | 2.4 in(60 mm) | 72% | 1.2 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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