Dayton, OH weather in August
Dayton is warm and often humid in August, with some rain: highs average 86°F and nights drop to about 64°F. Expect about 8 wet days. This is the peak of the warm season in Dayton.
- Normal high
- 86°F
- Normal low
- 64°F
- Wet days
- 8
- 3.1 in total
- Muggy days
- 12
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 86°F | 84°F |
| Normal low | 65°F | 62°F |
| Chance of a wet day | 29% | 26% |
| Sunrise / sunset | 6:35 am / 8:50 pm | 7:04 am / 8:10 pm |
| Daylight | 14.2 h | 13.1 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 am64°Fdew point 62°F
- 9 am72°Fdew point 64°F
- Noon80°Fdew point 63°F
- 3 pm82°Fdew point 62°F
- 6 pm80°Fdew point 63°F
- 9 pm72°Fdew point 64°F
NOAA hourly normals (local standard time) from Wright Patterson AFB (9 mi away); average wind 5 mph; clear or few clouds in 39% of daytime hours, mostly cloudy or overcast in 42%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F4 of 31
- Hot dayshigh 90°F or more11 of 31
- Muggy daysdaily mean dew point 65°F or more12 of 31
- Wet daysat least 0.01 in of rain or melted snow8 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 3.1 in; a dry August brings about 2.0 in and a wet one about 3.9 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, 1991-20202020: average high 91°F
- Coolest August1992: average high 80°F
- Wettest August2016: 7.7 in
- Driest August2010: 0.6 in
- Highest reading103°F (August 1, 1999)
- Lowest reading49°F (August 15, 2013)
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 | 87°F | 86°F | 79°F |
| Normal low | 66°F | 64°F | 56°F |
| Wet days | 10 | 8 | 8 |
| Comfortable days | 3 | 4 | 12 |
| Daylight | 14.7 h | 13.7 h | 12.4 h |
Highs change by -1°F from July and -7°F into September.
Nearby alternatives in August
- Cooler: South Bend, IN171 mi · high 81°F · 10 wet days
How Dayton ranks in August
- Normal high195th warmest of 378 cities; 2nd of 6 in Ohio
- Wet days169th driest of 378
- Comfortable days150th most of 341
What to pack for Dayton in August
- Light, breathable clothing – highs near 86°F and about 12 muggy days
- A rain jacket or umbrella – rain on about 8 days
Heating and cooling
August has 3 heating degree days and 308 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How hot is Dayton in August?
The normal high is 86°F and the normal low is 64°F. From 1991 to 2020 the hottest August reading was 103°F (August 1, 1999).
Does it rain a lot in Dayton in August?
About 8 days in August have at least 0.01 in of precipitation, and the normal total is 3.1 in. The wettest August in 1991-2020 was in 2016 (7.7 in); the driest was in 2010 (0.6 in).
Is August a good time to visit Dayton?
August ranks 6th of 12 months on our comfort score for Dayton (50 out of 100). It has about 4 comfortable days and about 11 days at 90°F or hotter. The best months are April, May and October.
Where the numbers come from
- Temperature, rain and frost dates: Dayton Mcd (USC00332067), 0.3 mi N of the city center, 720 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Dayton Intl Airport (USW00093815), 10 mi N of the city center, 1,000 ft (260 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Wright Patterson AFB (USW00013840), 9.1 mi NE of the city center, 823 ft (83 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: J.m.cox Dayton International Airport (724290-93815), 10 mi N of the city center, 993 ft (253 ft higher than the city). Hourly observations, 1991-2020.