Ann Arbor, MI weather in October
October in Ann Arbor: cool, with frequent rain. Highs 62°F, lows 41°F, about 13 days with rain.
- Normal high
- 62°F
- Normal low
- 41°F
- Wet days
- 13
- 3.0 in total
- Muggy days
- 0
- dew point 65°F+
How October changes from start to finish
| October 1 | October 31 | |
|---|---|---|
| Normal high | 69°F | 55°F |
| Normal low | 46°F | 36°F |
| Chance of a wet day | 40% | 43% |
| Sunrise / sunset | 7:32 am / 7:17 pm | 8:06 am / 6:30 pm |
| Daylight | 11.8 h | 10.4 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical October day
- 6 am46°Fdew point 41°F
- 9 am51°Fdew point 44°F
- Noon59°Fdew point 43°F
- 3 pm61°Fdew point 43°F
- 6 pm56°Fdew point 43°F
- 9 pm51°Fdew point 43°F
NOAA hourly normals (local standard time) from Detroit Willow Run Airport (10 mi away); average wind 9 mph; clear or few clouds in 54% of daytime hours, mostly cloudy or overcast in 40%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F11 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow13 of 31
- Notable rainat least 0.10 in7 of 31
- Freezing nightslow 32°F or below4 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per October, counted from daily records for each year 1991-2020.
Rain and snow in October
Normal precipitation is 3.0 in; a dry October brings about 2.2 in and a wet one about 3.5 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more. Normal snowfall is 0.1 in.
How October varies from year to year
- Warmest October, 1991-20202007: average high 69°F
- Coolest October2009: average high 58°F
- Wettest October2001: 7.6 in
- Driest October2005: 0.2 in
- Highest reading89°F (October 7, 2007)
- Lowest reading23°F (October 31, 2020)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
October compared with September and November
| September | October | November | |
|---|---|---|---|
| Normal high | 75°F | 62°F | 48°F |
| Normal low | 52°F | 41°F | 31°F |
| Wet days | 11 | 13 | 14 |
| Comfortable days | 16 | 11 | 2 |
| Daylight | 12.5 h | 11.1 h | 9.8 h |
Highs change by -13°F from September and -14°F into November.
Nearby alternatives in October
- Warmer: Cincinnati, OH223 mi · high 68°F · 9 wet days
- Drier: Warren, MI40 mi · high 61°F · 10 wet days
How Ann Arbor ranks in October
- Normal high294th warmest of 378 cities; 1st of 8 in Michigan
- Wet days351st driest of 378
- Comfortable days191st most of 340
What to pack for Ann Arbor in October
- A rain jacket or umbrella – rain on about 13 days
Frost in October
The first fall frost typically comes around Oct 13; in 1 year in 10 it comes before Sep 29. All frost dates for Ann Arbor.
Heating and cooling
October has 427 heating degree days and 7 cooling degree days (base 65°F), 6% of the year's total heating and cooling demand.
Questions
How cold is Ann Arbor in October?
The normal high is 62°F and the normal low is 41°F. From 1991 to 2020 the coldest October reading was 23°F (most recently on October 31, 2020).
Does it rain a lot in Ann Arbor in October?
About 13 days in October have at least 0.01 in of precipitation, and the normal total is 3.0 in. The wettest October in 1991-2020 was in 2001 (7.6 in); the driest was in 2005 (0.2 in).
Does it snow in Ann Arbor in October?
Yes. Normal snowfall in October is 0.1 in.
Is October a good time to visit Ann Arbor?
October ranks 6th of 12 months on our comfort score for Ann Arbor (59 out of 100). It has about 11 comfortable days. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Ann Arbor U Of Mich (USC00200230), 3.7 mi ENE of the city center, 813 ft (68 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Detroit Willow Run Airport (USW00014853), 10 mi ESE of the city center, 777 ft (104 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Cloud cover: Toledo Express Airport (USW00094830), 47 mi S of the city center, 669 ft (212 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Willow Run Airport (725376-14853), 11 mi ESE of the city center, 708 ft (173 ft lower than the city). Hourly observations, 1991-2020.