Suffolk County Weather in May
Average highs run from 66°F on May 1 to 74°F on May 31, and lows from 47°F to 56°F. Normal precipitation for the month is 3.60 in over about 11 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
- 70°F
- Average low
- 51°F
- Precipitation
- 3.60 in
- Record high
- 93°FMay 31, 2022
- Record low
- 24°FMay 1, 2008
- Chance of a freeze
- 1%
- Days of 90°F or more
- 0.5
- Daylight
- 13 h 58 min to 14 h 54 min
- Cloud cover
- 63%
- Humidity
- 84%
- Dew point
- 51°F
- Wind
- 9.4 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 | 66°F | 47°F | 81°F 1957 | 24°F 2008 | 36% | 0% |
| May 2 | 66°F | 47°F | 82°F 2001 | 30°F 2005 | 36% | 0% |
| May 3 | 67°F | 47°F | 84°F 2001 | 30°F 1966 | 36% | 0% |
| May 4 | 67°F | 48°F | 87°F 1965 | 26°F 2002 | 36% | 0% |
| May 5 | 67°F | 48°F | 79°F 2000 | 26°F 2003 | 36% | 0% |
| May 6 | 68°F | 48°F | 84°F 2000 | 29°F 1969 | 36% | 0% |
| May 7 | 68°F | 48°F | 85°F 2000 | 27°F 2007 | 36% | 0% |
| May 8 | 68°F | 49°F | 83°F 2000 | 27°F 2001 | 36% | 0% |
| May 9 | 68°F | 49°F | 82°F 1963 | 28°F 2016 | 36% | 0% |
| May 10 | 69°F | 49°F | 81°F 2001 | 26°F 2020 | 36% | 0% |
| May 11 | 69°F | 50°F | 84°F 2001 | 28°F 2010 | 36% | 0% |
| May 12 | 69°F | 50°F | 81°F 2004 | 31°F 1969 | 36% | 0% |
| May 13 | 70°F | 50°F | 86°F 1956 | 31°F 2010 | 36% | 0% |
| May 14 | 70°F | 50°F | 74°F 2022 | 26°F 2020 | 36% | 0% |
| May 15 | 70°F | 51°F | 75°F 1951 | 31°F 1999 | 36% | 0% |
| May 16 | 70°F | 51°F | 80°F 1960 | 30°F 2000 | 35% | 0% |
| May 17 | 71°F | 51°F | 82°F 2015 | 31°F 2003 | 35% | 0% |
| May 18 | 71°F | 52°F | 85°F 2017 | 25°F 2003 | 35% | 0% |
| May 19 | 71°F | 52°F | 86°F 2017 | 30°F 2002 | 35% | 0% |
| May 20 | 71°F | 52°F | 81°F 2026 | 29°F 2002 | 35% | 0% |
| May 21 | 72°F | 52°F | 86°F 1962 | 29°F 2002 | 35% | 0% |
| May 22 | 72°F | 53°F | 79°F 2021 | 32°F 2002 | 34% | 0% |
| May 23 | 72°F | 53°F | 89°F 2021 | 33°F 2006 | 34% | 0% |
| May 24 | 72°F | 53°F | 80°F 2018 | 35°F 2023 | 34% | 0% |
| May 25 | 73°F | 54°F | 88°F 2007 | 37°F 1956 | 34% | 0% |
| May 26 | 73°F | 54°F | 89°F 2010 | 36°F 2013 | 34% | 0% |
| May 27 | 73°F | 54°F | 86°F 2014 | 33°F 2013 | 34% | 0% |
| May 28 | 73°F | 55°F | 82°F 2012 | 39°F 2008 | 33% | 0% |
| May 29 | 74°F | 55°F | 91°F 1969 | 34°F 2008 | 33% | 0% |
| May 30 | 74°F | 55°F | 86°F 2011 | 33°F 2004 | 33% | 0% |
| May 31 | 74°F | 56°F | 93°F 2022 | 32°F 2026 | 33% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- May 1
- sunrise 5:49 AM, sunset 7:47 PM
- May 31
- sunrise 5:22 AM, sunset 8:16 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00307134 (Riverhead Rsch Farm), public domain. Records: NOAA GHCN-Daily, station USW00014719, 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.