Ann Arbor, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ann Arbor, a city in Washtenaw County, Michigan.
Tonight
61°F
Mostly Cloudy then Slight Chance Light Rain
A slight chance of rain after 4am. Mostly cloudy, with a low around 61. South southeast wind around 13 mph, with gusts as high as 22 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Ann Arbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Mostly Cloudy then Slight Chance Light Rain | 13 mph SSE | 17% |
| Wednesday | 69°F | Light Rain | 13 to 17 mph S | 97% |
| Wednesday Night | 50°F | Light Rain then Mostly Cloudy | 9 to 14 mph SSW | 81% |
| Thursday | 61°F | Mostly Cloudy then Slight Chance Light Rain | 10 to 17 mph SW | 17% |
| Thursday Night | 45°F | Slight Chance Light Rain | 3 to 8 mph W | 24% |
| Friday | 56°F | Chance Light Rain | 3 to 10 mph NW | 45% |
| Friday Night | 37°F | Chance Light Rain | 10 mph NW | 43% |
| Saturday | 52°F | Slight Chance Light Rain then Partly Sunny | 10 mph NW | 20% |
| Saturday Night | 32°F | Partly Cloudy | 6 mph W | 7% |
| Sunday | 56°F | Mostly Sunny then Slight Chance Light Rain | 5 to 12 mph W | 17% |
| Sunday Night | 34°F | Slight Chance Light Rain then Partly Cloudy | 7 to 10 mph WNW | 17% |
| Monday | 59°F | Mostly Sunny | 7 to 13 mph W | 12% |
| Monday Night | 38°F | Partly Cloudy | 10 mph WSW | 11% |
| Tuesday | 61°F | Mostly Sunny | 9 to 15 mph W | 4% |
Forecast source: National Weather Service (api.weather.gov) for Ann Arbor (42.276, -83.731). Updated through the day.
Growing snapshot for Ann Arbor
Last spring frost
May 5
First fall frost
Oct 10
Growing season
157 days
Hardiness zone
6a
More local growing data for Ann Arbor: nearby ZIP 48104 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Ann Arbor Se, Mi (1.9 mi from Ann Arbor). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.