Ann Arbor weather in August: Ann Arbor, Michigan: normal highs, lows, rain and records for August
Ann Arbor in August has a normal high of 81°F and a normal low of 57°F, a daily mean of 69°F, falling from 83°F on the 1st to 79°F by the 31st. Measurable precipitation falls on 12 days in a normal August, 2.69 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 14°C, 68 mm of precipitation in August.
- NOAA stationAnn Arbor Municipal Airport
- Station IDUSW00094889
- Location42.22°N 83.74°W
- Elevation839 ft (256 m)
- From the center4 miles
- Population122,925
- Jan 32° 15°
- Feb 35° 16°
- Mar 45° 25°
- Apr 59° 35°
- May 70° 46°
- Jun 79° 54°
- Jul 84° 57°
- Aug 81° 57°
- Sep 74° 48°
- Oct 62° 38°
- Nov 48° 30°
- Dec 36° 22°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Ann Arbor in August?
The normal high is 81°F and the normal low 57°F, for a daily mean of 69.2°F. August is 1.3°F cooler than July and 7.9°F warmer than September. August is the 2nd warmest month of the year in Ann Arbor and the 6th wettest. Across the month the normal high falls 4°F, from 83°F on August 1 to 79°F on August 31. From one year to the next August's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 67°F and 71°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 39%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 83°F | 58°F | 37% | 19% |
| August 8 | 83°F | 58°F | 38% | 19% |
| August 15 | 82°F | 58°F | 39% | 18% |
| August 22 | 81°F | 56°F | 39% | 17% |
| August 31 | 79°F | 54°F | 39% | 16% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 83°F | 58°F | 37% | 19% | 14 h 30 min |
| August 2 | 83°F | 58°F | 38% | 19% | 14 h 30 min |
| August 3 | 83°F | 58°F | 38% | 19% | 14 h 20 min |
| August 4 | 83°F | 58°F | 38% | 19% | 14 h 20 min |
| August 5 | 83°F | 58°F | 38% | 19% | 14 h 20 min |
| August 6 | 83°F | 58°F | 38% | 19% | 14 h 20 min |
| August 7 | 83°F | 58°F | 38% | 19% | 14 h 20 min |
| August 8 | 83°F | 58°F | 38% | 19% | 14 h 10 min |
| August 9 | 83°F | 58°F | 38% | 19% | 14 h 10 min |
| August 10 | 82°F | 58°F | 38% | 18% | 14 h 10 min |
| August 11 | 82°F | 58°F | 38% | 18% | 14 h 10 min |
| August 12 | 82°F | 58°F | 38% | 18% | 14 h |
| August 13 | 82°F | 58°F | 38% | 18% | 14 h |
| August 14 | 82°F | 58°F | 38% | 18% | 14 h |
| August 15 | 82°F | 58°F | 39% | 18% | 14 h |
| August 16 | 82°F | 57°F | 39% | 18% | 13 h 50 min |
| August 17 | 81°F | 57°F | 39% | 18% | 13 h 50 min |
| August 18 | 81°F | 57°F | 39% | 18% | 13 h 50 min |
| August 19 | 81°F | 57°F | 39% | 17% | 13 h 50 min |
| August 20 | 81°F | 57°F | 39% | 17% | 13 h 40 min |
| August 21 | 81°F | 57°F | 39% | 17% | 13 h 40 min |
| August 22 | 81°F | 56°F | 39% | 17% | 13 h 40 min |
| August 23 | 80°F | 56°F | 39% | 17% | 13 h 40 min |
| August 24 | 80°F | 56°F | 39% | 17% | 13 h 30 min |
| August 25 | 80°F | 56°F | 39% | 17% | 13 h 30 min |
| August 26 | 80°F | 55°F | 39% | 16% | 13 h 30 min |
| August 27 | 80°F | 55°F | 39% | 16% | 13 h 30 min |
| August 28 | 80°F | 55°F | 39% | 16% | 13 h 20 min |
| August 29 | 79°F | 55°F | 39% | 16% | 13 h 20 min |
| August 30 | 79°F | 54°F | 39% | 16% | 13 h 20 min |
| August 31 | 79°F | 54°F | 39% | 16% | 13 h 10 min |
- Normal high
- 81°FAugust average
- Normal low
- 57°FAugust average
- Precipitation
- 2.69 inmonth total
- Days with precipitation
- 120.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 14 h 30 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 30
- Days at 80°F or more
- 20
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094889; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Ann Arbor in August?
On a given August day the chance of 0.01 inch or more is 39% on average, highest around August 25 (39%). In all, 2.69 in falls on 12 days of a normal August, 1 of them with an inch or more.
In a normal August in Ann Arbor, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094889.
What are the records for August in Ann Arbor?
The warmest August temperature on this station's record (since 1998) is 96°F, on August 3, 2012; the coldest is 38°F, on August 31, 2009. The wettest August brought 5.32 in (2003).
The August mean against the 1991-2020 normal of 69.2°F: 2021 72.0°F (+2.8), 2022 69.5°F (+0.3), 2023 66.7°F (−2.5), 2024 69.5°F (+0.3), 2025 67.4°F (−1.8). 3 of 5 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.0°F | +2.8°F | 4.74 in |
| 2022 | 69.5°F | +0.3°F | 3.68 in |
| 2023 | 66.7°F | −2.5°F | 3.38 in |
| 2024 | 69.5°F | +0.3°F | 3.03 in |
| 2025 | 67.4°F | −1.8°F | – |
Source: records: ACIS, station USW00094889; recent months: ACIS, station USW00094889. Records and recent months use complete months only.
How does August in Ann Arbor compare across Michigan?
Across the 140 places PlainClimate covers in Michigan, August normal highs run from 72°F in Munising to 83°F in Morenci; Ann Arbor's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.