Belfast Weather in May
Average highs run from 65°F on May 1 to 73°F on May 31, and lows from 36°F to 46°F. Normal precipitation for the month is 3.54 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
- 69°F
- Average low
- 41°F
- Precipitation
- 3.54 in
- Snowfall
- 0.1 in
- Record high
- 92°FMay 16, 1906
- Record low
- 15°FMay 1, 1963
- Chance of a freeze
- 90%
- Daylight
- 14 h 04 min to 15 h 03 min
- Cloud cover
- 67%
- Humidity
- 78%
- Dew point
- 47°F
- Wind
- 4.9 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 | 65°F | 36°F | 86°F 1942 | 15°F 1963 | 46% | 2% |
| May 2 | 65°F | 37°F | 82°F 1942 | 15°F 1963 | 46% | 2% |
| May 3 | 65°F | 37°F | 82°F 2018 | 19°F 1966 | 46% | 2% |
| May 4 | 66°F | 37°F | 84°F 2012 | 19°F 1908 | 46% | 1% |
| May 5 | 66°F | 38°F | 88°F 1950 | 17°F 1966 | 46% | 1% |
| May 6 | 67°F | 38°F | 82°F 1943 | 20°F 1968 | 45% | 1% |
| May 7 | 67°F | 38°F | 83°F 1936 | 19°F 1968 | 45% | 1% |
| May 8 | 67°F | 39°F | 83°F 1936 | 23°F 1956 | 45% | 1% |
| May 9 | 68°F | 39°F | 85°F 1979 | 20°F 1977 | 45% | 1% |
| May 10 | 68°F | 39°F | 87°F 2015 | 20°F 1962 | 45% | 1% |
| May 11 | 68°F | 40°F | 88°F 1936 | 15°F 1963 | 45% | 1% |
| May 12 | 69°F | 40°F | 84°F 2015 | 20°F 1907 | 45% | 1% |
| May 13 | 69°F | 40°F | 83°F 2011 | 24°F 1967 | 45% | 1% |
| May 14 | 69°F | 41°F | 85°F 2014 | 24°F 1939 | 45% | 1% |
| May 15 | 69°F | 41°F | 85°F 1974 | 26°F 1902 | 45% | 0% |
| May 16 | 70°F | 41°F | 92°F 1906 | 22°F 1934 | 45% | 0% |
| May 17 | 70°F | 42°F | 88°F 1998 | 23°F 1983 | 45% | 0% |
| May 18 | 70°F | 42°F | 85°F 1903 | 23°F 1983 | 45% | 0% |
| May 19 | 70°F | 42°F | 90°F 2026 | 26°F 2009 | 44% | 0% |
| May 20 | 71°F | 43°F | 89°F 1996 | 27°F 1956 | 44% | 0% |
| May 21 | 71°F | 43°F | 88°F 1977 | 25°F 1906 | 44% | 0% |
| May 22 | 71°F | 43°F | 90°F 1977 | 25°F 1935 | 44% | 0% |
| May 23 | 71°F | 44°F | 90°F 1977 | 21°F 1967 | 44% | 0% |
| May 24 | 72°F | 44°F | 89°F 1964 | 22°F 1963 | 44% | 0% |
| May 25 | 72°F | 44°F | 89°F 1908 | 22°F 1956 | 44% | 0% |
| May 26 | 72°F | 45°F | 88°F 2020 | 20°F 1956 | 44% | 0% |
| May 27 | 72°F | 45°F | 86°F 1991 | 24°F 1969 | 44% | 0% |
| May 28 | 72°F | 45°F | 88°F 1908 | 27°F 1961 | 44% | 0% |
| May 29 | 73°F | 45°F | 87°F 2012 | 28°F 1906 | 44% | 0% |
| May 30 | 73°F | 46°F | 88°F 2006 | 26°F 1961 | 44% | 0% |
| May 31 | 73°F | 46°F | 90°F 2006 | 28°F 1907 | 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 6:08 AM, sunset 8:12 PM
- May 31
- sunrise 5:39 AM, sunset 8:42 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00300183 (Angelica), public domain. Records: NOAA GHCN-Daily, station USC00303025, 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.