Mechanicsburg Weather in May
Average highs run from 68°F on May 1 to 77°F on May 31, and lows from 44°F to 55°F. Normal precipitation for the month is 4.90 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
- 72°F
- Average low
- 50°F
- Precipitation
- 4.90 in
- Record high
- 93°FMay 18, 1962
- Record low
- 23°FMay 10, 1966
- Chance of a freeze
- 30%
- Daylight
- 13 h 55 min to 14 h 49 min
- Cloud cover
- 66%
- Humidity
- 78%
- Dew point
- 54°F
- Wind
- 9.8 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 | 68°F | 44°F | 87°F 1942 | 26°F 1943 | 45% | 0% |
| May 2 | 68°F | 45°F | 90°F 1959 | 27°F 1961 | 45% | 0% |
| May 3 | 68°F | 45°F | 88°F 2024 | 30°F 1978 | 45% | 0% |
| May 4 | 69°F | 46°F | 88°F 1949 | 26°F 1957 | 45% | 0% |
| May 5 | 69°F | 46°F | 89°F 1952 | 31°F 1957 | 45% | 0% |
| May 6 | 69°F | 46°F | 89°F 1959 | 27°F 1968 | 45% | 0% |
| May 7 | 70°F | 47°F | 85°F 1926 | 28°F 1974 | 45% | 0% |
| May 8 | 70°F | 47°F | 87°F 1926 | 26°F 1947 | 45% | 0% |
| May 9 | 70°F | 47°F | 88°F 1936 | 25°F 1947 | 45% | 0% |
| May 10 | 70°F | 48°F | 91°F 1936 | 23°F 1966 | 45% | 0% |
| May 11 | 71°F | 48°F | 90°F 1936 | 30°F 1945 | 45% | 0% |
| May 12 | 71°F | 48°F | 88°F 1979 | 31°F 1938 | 45% | 0% |
| May 13 | 71°F | 49°F | 88°F 1982 | 31°F 1996 | 45% | 0% |
| May 14 | 72°F | 49°F | 90°F 1962 | 30°F 1996 | 45% | 0% |
| May 15 | 72°F | 49°F | 90°F 1962 | 34°F 1973 | 45% | 0% |
| May 16 | 72°F | 50°F | 89°F 1962 | 28°F 1959 | 45% | 0% |
| May 17 | 73°F | 50°F | 92°F 1962 | 34°F 1973 | 45% | 0% |
| May 18 | 73°F | 50°F | 93°F 1962 | 35°F 1919 | 45% | 0% |
| May 19 | 73°F | 51°F | 92°F 1962 | 33°F 2002 | 45% | 0% |
| May 20 | 74°F | 51°F | 90°F 1977 | 34°F 1929 | 45% | 0% |
| May 21 | 74°F | 51°F | 90°F 1934 | 36°F 1954 | 44% | 0% |
| May 22 | 74°F | 52°F | 89°F 1941 | 31°F 1924 | 44% | 0% |
| May 23 | 75°F | 52°F | 90°F 1925 | 32°F 1963 | 44% | 0% |
| May 24 | 75°F | 52°F | 89°F 1975 | 31°F 1963 | 44% | 0% |
| May 25 | 75°F | 53°F | 91°F 1975 | 32°F 1925 | 44% | 0% |
| May 26 | 75°F | 53°F | 88°F 1918 | 35°F 1924 | 44% | 0% |
| May 27 | 76°F | 53°F | 90°F 2012 | 30°F 1961 | 44% | 0% |
| May 28 | 76°F | 54°F | 91°F 2012 | 36°F 1971 | 44% | 0% |
| May 29 | 76°F | 54°F | 91°F 1941 | 34°F 1965 | 44% | 0% |
| May 30 | 77°F | 54°F | 89°F 1929 | 34°F 1984 | 44% | 0% |
| May 31 | 77°F | 55°F | 92°F 1934 | 37°F 1966 | 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 6:34 AM, sunset 8:29 PM
- May 31
- sunrise 6:08 AM, sunset 8:57 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00338552 (Urbana Wwtp), public domain. Records: NOAA GHCN-Daily, station USC00334681, 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.