Dayton Weather in May
Average highs run from 67°F on May 1 to 74°F on May 31, and lows from 40°F to 50°F. Normal precipitation for the month is 4.06 in over about 14 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 71°F
- Average low
- 45°F
- Precipitation
- 4.06 in
- Record high
- 91°FMay 9, 2015
- Record low
- 16°FMay 10, 1947
- Chance of a freeze
- 72%
- Daylight
- 13 h 59 min to 14 h 54 min
- Cloud cover
- 69%
- Humidity
- 79%
- Dew point
- 50°F
- Wind
- 4.5 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| May 1 | 67°F | 40°F | 89°F 1970 | 22°F 1978 | 47% | |
| May 2 | 67°F | 41°F | 86°F 2001 | 23°F 1963 | 47% | |
| May 3 | 68°F | 41°F | 88°F 2001 | 20°F 1957 | 47% | |
| May 4 | 68°F | 41°F | 88°F 2001 | 25°F 1957 | 47% | |
| May 5 | 68°F | 42°F | 89°F 1949 | 26°F 1961 | 47% | |
| May 6 | 69°F | 42°F | 88°F 1949 | 27°F 1968 | 46% | |
| May 7 | 69°F | 42°F | 88°F 2000 | 24°F 1970 | 46% | |
| May 8 | 69°F | 43°F | 89°F 1979 | 25°F 1950 | 46% | |
| May 9 | 69°F | 43°F | 91°F 2015 | 24°F 2020 | 46% | |
| May 10 | 70°F | 43°F | 87°F 1993 | 16°F 1947 | 46% | |
| May 11 | 70°F | 44°F | 90°F 2015 | 21°F 1947 | 46% | 0% |
| May 12 | 70°F | 44°F | 88°F 2015 | 29°F 1963 | 46% | 0% |
| May 13 | 70°F | 44°F | 87°F 2004 | 29°F 1994 | 46% | 0% |
| May 14 | 70°F | 45°F | 90°F 1962 | 27°F 1996 | 46% | 0% |
| May 15 | 71°F | 45°F | 89°F 1998 | 28°F 2013 | 46% | 0% |
| May 16 | 71°F | 45°F | 90°F 1962 | 29°F 1973 | 46% | 0% |
| May 17 | 71°F | 46°F | 90°F 1962 | 25°F 1956 | 45% | 0% |
| May 18 | 71°F | 46°F | 91°F 1962 | 30°F 1955 | 45% | 0% |
| May 19 | 72°F | 46°F | 90°F 1996 | 30°F 2002 | 45% | 0% |
| May 20 | 72°F | 47°F | 90°F 1959 | 29°F 1948 | 45% | 0% |
| May 21 | 72°F | 47°F | 90°F 2021 | 29°F 2002 | 44% | 0% |
| May 22 | 72°F | 47°F | 88°F 2021 | 29°F 2002 | 44% | 0% |
| May 23 | 72°F | 48°F | 87°F 1962 | 29°F 2006 | 44% | 0% |
| May 24 | 73°F | 48°F | 88°F 1962 | 27°F 1956 | 44% | 0% |
| May 25 | 73°F | 48°F | 85°F 1991 | 27°F 1956 | 44% | 0% |
| May 26 | 73°F | 49°F | 89°F 2020 | 31°F 1988 | 44% | 0% |
| May 27 | 73°F | 49°F | 89°F 2020 | 32°F 2013 | 44% | 0% |
| May 28 | 74°F | 49°F | 91°F 2012 | 31°F 1961 | 43% | 0% |
| May 29 | 74°F | 50°F | 90°F 2016 | 28°F 1949 | 43% | 0% |
| May 30 | 74°F | 50°F | 91°F 2006 | 30°F 1949 | 43% | 0% |
| May 31 | 74°F | 50°F | 90°F 2006 | 31°F 1947 | 43% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- May 1
- sunrise 6:15 AM, sunset 8:14 PM
- May 31
- sunrise 5:48 AM, sunset 8:42 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00367229 (Putneyville 2 Se Dam), public domain. Records: NOAA GHCN-Daily, station USC00364214, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.