Detroit, MI weather in August
Expect warm weather with some rain in Detroit in August, with highs near 81°F and lows near 64°F. Rain falls on about 10 days. It is one of the warmest months in Detroit. Good for outdoor plans.
- Normal high
- 81°F
- Normal low
- 64°F
- Wet days
- 10
- 3.3 in total
- Muggy days
- 9
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 83°F | 79°F |
| Normal low | 65°F | 61°F |
| Chance of a wet day | 33% | 31% |
| Sunrise / sunset | 6:24 am / 8:52 pm | 6:56 am / 8:08 pm |
| Daylight | 14.4 h | 13.2 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 August day
- 6 am66°Fdew point 60°F
- 9 am73°Fdew point 62°F
- Noon78°Fdew point 61°F
- 3 pm80°Fdew point 60°F
- 6 pm78°Fdew point 60°F
- 9 pm73°Fdew point 61°F
NOAA hourly normals (local standard time) from Detroit City Airport (6 mi away); average wind 7 mph; clear or few clouds in 46% of daytime hours, mostly cloudy or overcast in 33%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F9 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph15 of 31
- Hot dayshigh 90°F or more3 of 31
- Muggy daysdaily mean dew point 65°F or more9 of 31
- Wet daysat least 0.01 in of rain or melted snow10 of 31
- Notable rainat least 0.10 in6 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 3.3 in; a dry August brings about 2.1 in and a wet one about 4.3 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202016: average high 85°F
- Coolest August1992: average high 76°F
- Wettest August2007: 6.6 in
- Driest August2008: 0.3 in
- Highest reading102°F (August 7, 2001)
- Lowest reading48°F (August 31, 2009)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 84°F | 81°F | 74°F |
| Normal low | 65°F | 64°F | 56°F |
| Wet days | 11 | 10 | 10 |
| Comfortable days | 6 | 9 | 15 |
| Daylight | 14.9 h | 13.8 h | 12.5 h |
Highs change by -3°F from July and -7°F into September.
How Detroit ranks in August
- Normal high291st warmest of 378 cities; 3rd of 8 in Michigan
- Wet days243rd driest of 378
- Comfortable days82nd most of 341
What to pack for Detroit in August
- A rain jacket or umbrella – rain on about 10 days
- A swimsuit – about 15 beach days
Heating and cooling
August has 7 heating degree days and 241 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How hot is Detroit in August?
The normal high is 81°F and the normal low is 64°F. From 1991 to 2020 the hottest August reading was 102°F (August 7, 2001).
Does it rain a lot in Detroit in August?
About 10 days in August have at least 0.01 in of precipitation, and the normal total is 3.3 in. The wettest August in 1991-2020 was in 2007 (6.6 in); the driest was in 2008 (0.3 in).
Is August a good time to visit Detroit?
August ranks 4th of 12 months on our comfort score for Detroit (61 out of 100). It has about 9 comfortable days and about 3 days at 90°F or hotter. The best months are May, June and September.
Where the numbers come from
- Temperature, frost dates and humidity and wind by hour: Detroit City Airport (USW00014822), 5.7 mi NNE of the city center, 626 ft . NOAA normals and daily records, 1991-2020.
- Rain, snowfall and snow depth: Detroit Metro Airport (USW00094847), 16 mi WSW of the city center, 631 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: Flint Bishop Intl Airport (USW00014826), 57 mi NW of the city center, 770 ft (172 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Detroit City Airport (725375-14822), 5.5 mi NNE of the city center, 623 ft . Hourly observations, 1991-2020.