Climate averages 1991–2020
Dayton weather
in May.
A warm, wet month: the 5th warmest and one of the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a warm month in Dayton: daytime highs average 22.0°C and nights cool to about 12.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 116 mm of rain on roughly 13 days, which makes May a wet month (one of the wettest months of the year). Daylight, from sunrise to sunset, lasts about 14 h 21 min on an average May day.
The nearest other city in this atlas is Cincinnati (76 km away). In May its highs average 22.4°C, about as warm as Dayton, with 117 mm of rain.
Among the 498 cities listed in the United States, Dayton ranks joint 296th of 498 for the warmest May highs and joint 429th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Dayton is 1.8°C cooler than that mean.
From May to June, average highs rise by 4.5°C to 26.5°C, and monthly rainfall falls from 116 mm to 106 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Cincinnati in MayUnited States · 76 kmHigh 22.4°C · Low 12.5°C · 117 mm rain
- Columbus in MayUnited States · 104 kmHigh 21.8°C · Low 11.6°C · 113 mm rain
- Muncie in MayUnited States · 113 kmHigh 21.4°C · Low 11.5°C · 114 mm rain
- Fishers in MayUnited States · 157 kmHigh 21.8°C · Low 12.0°C · 118 mm rain
- Carmel in MayUnited States · 166 kmHigh 21.7°C · Low 12.1°C · 118 mm rain
- Indianapolis in MayUnited States · 168 kmHigh 22.0°C · Low 12.4°C · 122 mm rain
- Fort Wayne in MayUnited States · 172 kmHigh 21.0°C · Low 10.8°C · 103 mm rain
- Meads in MayUnited States · 197 kmHigh 23.2°C · Low 13.5°C · 119 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.