Climate averages 1991–2020
Dayton weather
in August.
A warm, moderately wet month: the 2nd warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Dayton: daytime highs average 27.9°C and nights cool to about 18.9°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 81 mm of rain on roughly 10 days, which makes August a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 44 min on an average August day.
The nearest other city in this atlas is Cincinnati (76 km away). In August its highs average 28.5°C, 0.7°C warmer than Dayton, with 75 mm of rain.
Among the 498 cities listed in the United States, Dayton ranks joint 331st of 498 for the warmest August highs and joint 268th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Dayton is 2.0°C cooler than that mean.
From August to September, average highs fall by 3.5°C to 24.4°C, and monthly rainfall falls from 81 mm to 68 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Dayton climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.3°C-5.5°C | -5.5°C | 82 | 9.8 | 9.710 h |
| February | 4.6°C-4.1°C | -4.1°C | 70 | 9.3 | 10.711 h |
| March | 10.0°C0.4°C | 0.4°C | 100 | 11.1 | 11.912 h |
| April | 16.8°C6.4°C | 6.4°C | 116 | 12.7 | 13.213 h |
| May | 22.0°C12.3°C | 12.3°C | 116 | 13.3 | 14.314 h |
| June | 26.5°C17.4°C | 17.4°C | 106 | 12.6 | 14.915 h |
| July | 28.4°C19.5°C | 19.5°C | 86 | 11.6 | 14.715 h |
| August, selected | 27.9°C18.9°C | 18.9°C | 81 | 10.0 | 13.714 h |
| September | 24.4°C15.3°C | 15.3°C | 68 | 7.8 | 12.512 h |
| October | 17.6°C9.0°C | 9.0°C | 74 | 8.4 | 11.211 h |
| November | 10.4°C2.8°C | 2.8°C | 82 | 8.9 | 10.010 h |
| December | 4.6°C-2.3°C | -2.3°C | 85 | 9.7 | 9.49 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Cincinnati in AugustUnited States · 76 kmHigh 28.5°C · Low 18.9°C · 75 mm rain
- Columbus in AugustUnited States · 104 kmHigh 27.8°C · Low 18.3°C · 73 mm rain
- Muncie in AugustUnited States · 113 kmHigh 27.1°C · Low 18.0°C · 79 mm rain
- Fishers in AugustUnited States · 157 kmHigh 27.6°C · Low 18.4°C · 74 mm rain
- Carmel in AugustUnited States · 166 kmHigh 27.5°C · Low 18.5°C · 74 mm rain
- Indianapolis in AugustUnited States · 168 kmHigh 28.0°C · Low 18.9°C · 72 mm rain
- Fort Wayne in AugustUnited States · 172 kmHigh 26.9°C · Low 17.7°C · 88 mm rain
- Meads in AugustUnited States · 197 kmHigh 29.2°C · Low 19.8°C · 84 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Dayton) is explained once on the Dayton year overview and on the Sources, method and limits page.