Joshua Tree National Park / Public domain
Naperville, IL Weather on May 15
May 15th in Naperville, IL typically brings pleasant spring weather, with average highs around 72°F and lows near 48°F. Over 55 years of records, the warmest May 15th was in 1998 (76°F average), while the coldest was 2016 (40°F) — a 36°F range across recorded history. Rain or other precipitation has occurred on about 40% of May 15th dates historically, with the wettest May 15th recording 6.1" of rain. The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
What to Expect on May 15
Planning for May 15th in Naperville, IL? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
May 15 Weather Records for Naperville
- •The all-time record high for May 15th in Naperville, IL is 91°F, set in 2013.
- •The coldest May 15th on record dropped to 32°F in 2016.
- •Temperatures have reached 90°F or higher on May 15th in 4 of the last 55 years.
- •A freeze (32°F or below) has occurred on May 15th in 1 of the last 55 years.
- •Last year (1971), May 15th was 12°F warmer than the long-term average.
Frequently Asked Questions
What was the warmest May 15 ever in Naperville?
The warmest May 15 in Naperville, IL reached 91°F in 2013. That is 19°F above the long-term average high of 72°F.
What was the coldest May 15 ever in Naperville?
The coldest May 15 in Naperville, IL dropped to 32°F in 2016. That is 16°F below the long-term average low of 48°F.
What is the average temperature on May 15 in Naperville?
On May 15, Naperville averages a high of 72°F and a low of 48°F based on 55 years of NOAA weather observations from WHEATON 3 SE.
How many years of weather data are available for May 15 in Naperville?
We have 55 years of weather records for May 15 in Naperville, IL, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
May 15 Weather History in Naperville
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 80°F | 62°F | 0" | -- |
| 2024 | 62°F | 50°F | 0" | -- |
| 2023 | 63°F | 48°F | 0.18" | -- |
| 2022 | 87°F | 59°F | 0" | -- |
| 2021 | 73°F | 44°F | 0" | -- |
| 2020 | 73°F | 55°F | 6.1" | -- |
| 2019 | 72°F | 44°F | 0" | -- |
| 2018 | 85°F | 56°F | 1.3" | -- |
| 2017 | 77°F | 45°F | 0" | -- |
| 2016 | 48°F | 32°F | 0" | -- |
| 2015 | 68°F | 50°F | 0.51" | -- |
| 2014 | 57°F | 41°F | 1.27" | -- |
| 2013 | 91°F | 59°F | 0" | -- |
| 2012 | 79°F | 45°F | 0" | -- |
| 2011 | 54°F | 45°F | 1.02" | -- |
| 2010 | 67°F | 43°F | 0" | -- |
| 2009 | 69°F | 54°F | 0.08" | -- |
| 2008 | 66°F | 38°F | 0" | -- |
| 2007 | 90°F | 59°F | 0" | -- |
| 2006 | 62°F | 46°F | 0.43" | -- |
| 2005 | 65°F | 42°F | 0" | -- |
| 2004 | 59°F | 47°F | 2.64" | -- |
| 2003 | 57°F | 46°F | 0.33" | -- |
| 2002 | 77°F | 38°F | 0" | -- |
| 2001 | 90°F | 55°F | 0.58" | -- |
| 2000 | 73°F | 36°F | 0" | -- |
| 1999 | 75°F | 50°F | 0" | -- |
| 1998 | 90°F | 62°F | 0" | -- |
| 1997 | 54°F | 37°F | 0.05" | -- |
| 1996 | 62°F | 47°F | 0.3" | -- |
| 1995 | 76°F | 44°F | 0" | -- |
| 1994 | 78°F | 59°F | 0.25" | -- |
| 1993 | 83°F | 50°F | 0" | -- |
| 1992 | 72°F | 40°F | 0.03" | -- |
| 1991 | 87°F | 56°F | 0" | -- |
| 1990 | 64°F | 52°F | 0" | -- |
| 1989 | 71°F | 43°F | 0" | -- |
| 1988 | 83°F | 64°F | 0" | -- |
| 1987 | 85°F | 49°F | 0" | -- |
| 1986 | 70°F | 59°F | 0" | -- |
| 1985 | 85°F | 57°F | 1.3" | -- |
| 1984 | 70°F | 37°F | 0" | -- |
| 1983 | 60°F | 44°F | 0.61" | -- |
| 1982 | 86°F | 55°F | 0" | -- |
| 1981 | 71°F | 43°F | 1.93" | -- |
| 1980 | 67°F | 46°F | 0" | -- |
| 1979 | 67°F | 42°F | 0.28" | -- |
| 1978 | 60°F | 48°F | 0.13" | -- |
| 1977 | 86°F | 53°F | 0" | -- |
| 1976 | 71°F | 52°F | 0" | -- |
| 1975 | 75°F | 45°F | 1.04" | -- |
| 1974 | 64°F | 45°F | 1.98" | -- |
| 1973 | 65°F | 34°F | 0" | -- |
| 1972 | 65°F | 46°F | 0" | -- |
| 1971 | 84°F | 55°F | 0" | -- |
Based on 55 years of data from NOAA station: WHEATON 3 SE
Monthly Climate Averages
Historical temperature and precipitation averages for Naperville, IL, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.