Joliet Weather in May
Average highs run from 60°F on May 1 to 71°F on May 31, and lows from 31°F to 41°F. Normal precipitation for the month is 2.67 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
- 66°F
- Average low
- 36°F
- Precipitation
- 2.67 in
- Snowfall
- 0.8 in
- Record high
- 99°FMay 13, 2026
- Record low
- 23°FMay 2, 2005
- Chance of a freeze
- 100%
- Daylight
- 14 h 19 min to 15 h 26 min
- Cloud cover
- 69%
- Humidity
- 58%
- Dew point
- 37°F
- Wind
- 8.5 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 | 60°F | 31°F | 83°F 2000 | 28°F 2009 | 32% | 4% |
| May 2 | 61°F | 31°F | 83°F 2023 | 23°F 2005 | 32% | 4% |
| May 3 | 61°F | 32°F | 84°F 2025 | 25°F 2005 | 33% | 3% |
| May 4 | 62°F | 32°F | 86°F 2004 | 25°F 2024 | 33% | 3% |
| May 5 | 62°F | 32°F | 88°F 2016 | 27°F 2006 | 33% | 3% |
| May 6 | 62°F | 33°F | 88°F 2017 | 26°F 2026 | 33% | 3% |
| May 7 | 63°F | 33°F | 82°F 2004 | 30°F 2010 | 34% | 2% |
| May 8 | 63°F | 33°F | 85°F 2004 | 28°F 2002 | 34% | 2% |
| May 9 | 63°F | 34°F | 88°F 2012 | 24°F 2002 | 34% | 2% |
| May 10 | 64°F | 34°F | 90°F 2025 | 31°F 2015 | 34% | 2% |
| May 11 | 64°F | 35°F | 86°F 2026 | 28°F 2015 | 35% | 2% |
| May 12 | 64°F | 35°F | 92°F 2001 | 28°F 2005 | 35% | 2% |
| May 13 | 65°F | 35°F | 99°F 2026 | 26°F 2004 | 35% | 2% |
| May 14 | 65°F | 36°F | 87°F 2001 | 29°F 2004 | 35% | 1% |
| May 15 | 65°F | 36°F | 88°F 2012 | 34°F 2004 | 35% | 1% |
| May 16 | 66°F | 37°F | 91°F 2012 | 33°F 2009 | 36% | 1% |
| May 17 | 66°F | 37°F | 89°F 2006 | 33°F 2002 | 36% | 1% |
| May 18 | 67°F | 37°F | 92°F 2006 | 35°F 2003 | 36% | 1% |
| May 19 | 67°F | 38°F | 92°F 2009 | 28°F 2026 | 36% | 1% |
| May 20 | 67°F | 38°F | 89°F 2008 | 29°F 2003 | 36% | 1% |
| May 21 | 68°F | 38°F | 90°F 2012 | 33°F 2021 | 36% | 1% |
| May 22 | 68°F | 39°F | 88°F 2006 | 33°F 2021 | 37% | 1% |
| May 23 | 68°F | 39°F | 84°F 2014 | 32°F 2002 | 37% | 1% |
| May 24 | 69°F | 39°F | 88°F 2026 | 34°F 2007 | 37% | 1% |
| May 25 | 69°F | 40°F | 92°F 2026 | 31°F 2004 | 37% | 1% |
| May 26 | 69°F | 40°F | 90°F 2026 | 32°F 2012 | 37% | 1% |
| May 27 | 70°F | 40°F | 90°F 2026 | 38°F 2012 | 37% | 0% |
| May 28 | 70°F | 40°F | 90°F 2026 | 33°F 2011 | 37% | 0% |
| May 29 | 70°F | 41°F | 95°F 2026 | 35°F 2012 | 37% | 0% |
| May 30 | 70°F | 41°F | 88°F 2009 | 36°F 2021 | 37% | 0% |
| May 31 | 71°F | 41°F | 96°F 2020 | 39°F 2005 | 37% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- May 1
- sunrise 6:04 AM, sunset 8:23 PM
- May 31
- sunrise 5:31 AM, sunset 8:57 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00244506 (Joliet), public domain. Records: NOAA GHCN-Daily, station USC00240801, 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.