Joliet Weather in May
Average highs run from 66°F on May 1 to 76°F on May 31, and lows from 44°F to 55°F. Normal precipitation for the month is 4.53 in over about 12 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
- 49°F
- Precipitation
- 4.53 in
- Record high
- 95°FMay 28, 2012
- Record low
- 28°FMay 10, 2020
- Chance of a freeze
- 20%
- Days of 90°F or more
- 0.8
- Daylight
- 14 h 01 min to 14 h 58 min
- Cloud cover
- 66%
- Humidity
- 76%
- Dew point
- 52°F
- Wind
- 10.7 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 | 44°F | 85°F 2001 | 30°F 1978 | 42% | 0% |
| May 2 | 66°F | 45°F | 87°F 1992 | 30°F 1978 | 42% | 0% |
| May 3 | 67°F | 45°F | 85°F 2018 | 30°F 2005 | 42% | 0% |
| May 4 | 67°F | 45°F | 85°F 2001 | 30°F 2005 | 42% | 0% |
| May 5 | 67°F | 46°F | 86°F 1980 | 35°F 2005 | 42% | 0% |
| May 6 | 68°F | 46°F | 88°F 1980 | 32°F 1989 | 41% | 0% |
| May 7 | 68°F | 46°F | 86°F 2004 | 30°F 1989 | 41% | 0% |
| May 8 | 68°F | 47°F | 85°F 1988 | 31°F 1989 | 41% | 0% |
| May 9 | 69°F | 47°F | 89°F 2014 | 30°F 2020 | 41% | 0% |
| May 10 | 69°F | 47°F | 87°F 1979 | 28°F 2020 | 41% | 0% |
| May 11 | 69°F | 48°F | 90°F 2011 | 33°F 2021 | 41% | 0% |
| May 12 | 70°F | 48°F | 92°F 2022 | 30°F 1981 | 41% | 0% |
| May 13 | 70°F | 48°F | 90°F 2022 | 33°F 2021 | 41% | 0% |
| May 14 | 70°F | 49°F | 89°F 2022 | 35°F 2002 | 41% | 0% |
| May 15 | 71°F | 49°F | 91°F 2013 | 36°F 2016 | 41% | 0% |
| May 16 | 71°F | 49°F | 93°F 2025 | 35°F 1997 | 41% | 0% |
| May 17 | 71°F | 50°F | 92°F 2001 | 36°F 1997 | 40% | 0% |
| May 18 | 72°F | 50°F | 92°F 2001 | 35°F 2002 | 40% | 0% |
| May 19 | 72°F | 50°F | 92°F 2001 | 34°F 2002 | 40% | 0% |
| May 20 | 72°F | 51°F | 91°F 1977 | 39°F 1981 | 40% | 0% |
| May 21 | 73°F | 51°F | 91°F 1998 | 33°F 2002 | 40% | 0% |
| May 22 | 73°F | 52°F | 90°F 1987 | 34°F 2002 | 40% | 0% |
| May 23 | 73°F | 52°F | 88°F 1977 | 42°F 2006 | 40% | 0% |
| May 24 | 74°F | 52°F | 89°F 2010 | 40°F 1992 | 40% | 0% |
| May 25 | 74°F | 53°F | 92°F 2021 | 37°F 1992 | 39% | 0% |
| May 26 | 74°F | 53°F | 88°F 1977 | 34°F 1979 | 39% | 0% |
| May 27 | 75°F | 53°F | 92°F 1985 | 35°F 1992 | 39% | 0% |
| May 28 | 75°F | 54°F | 95°F 2012 | 37°F 1992 | 39% | 0% |
| May 29 | 75°F | 54°F | 94°F 2018 | 38°F 1992 | 39% | 0% |
| May 30 | 76°F | 54°F | 93°F 2006 | 39°F 1984 | 39% | 0% |
| May 31 | 76°F | 55°F | 93°F 2006 | 40°F 2021 | 38% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- May 1
- sunrise 5:49 AM, sunset 7:50 PM
- May 31
- sunrise 5:21 AM, sunset 8:19 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00114530 (Joliet Brandon Rd Dam), public domain. Records: NOAA GHCN-Daily, station USC00114530, 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.