Naperville Weather in July
Average highs run from 86°F on July 1 to 84°F on July 31, and lows from 63°F to 63°F. Normal precipitation for the month is 3.86 in over about 9 wet days.
July day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
July at a glance
- Average high
- 86°F
- Average low
- 63°F
- Precipitation
- 3.86 in
- Record high
- 100°FJul 6, 2012
- Record low
- 42°FJul 2, 2001
- Chance of a freeze
- 0%
- Days of 90°F or more
- 10.0
- Daylight
- 15 h 09 min to 14 h 26 min
- Cloud cover
- 68%
- Humidity
- 73%
- Dew point
- 63°F
- Wind
- 8.3 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 |
|---|---|---|---|---|---|---|
| Jul 1 | 86°F | 63°F | 92°F 2018 | 48°F 2001 | 30% | 0% |
| Jul 2 | 86°F | 63°F | 95°F 2012 | 42°F 2001 | 30% | 0% |
| Jul 3 | 86°F | 63°F | 94°F 2012 | 52°F 2005 | 30% | 0% |
| Jul 4 | 86°F | 63°F | 98°F 2012 | 50°F 2008 | 29% | 0% |
| Jul 5 | 86°F | 63°F | 99°F 2012 | 50°F 1997 | 29% | 0% |
| Jul 6 | 86°F | 63°F | 100°F 2012 | 49°F 2001 | 29% | 0% |
| Jul 7 | 86°F | 63°F | 100°F 2012 | 51°F 1997 | 29% | 0% |
| Jul 8 | 86°F | 63°F | 93°F 2002 | 51°F 2015 | 29% | 0% |
| Jul 9 | 86°F | 63°F | 92°F 2001 | 50°F 1997 | 29% | 0% |
| Jul 10 | 86°F | 63°F | 95°F 2019 | 46°F 1997 | 29% | 0% |
| Jul 11 | 86°F | 63°F | 90°F 2005 | 50°F 1997 | 29% | 0% |
| Jul 12 | 86°F | 63°F | 90°F 2012 | 54°F 2002 | 29% | 0% |
| Jul 13 | 86°F | 63°F | 95°F 2019 | 52°F 2002 | 29% | 0% |
| Jul 14 | 86°F | 63°F | 95°F 2019 | 52°F 2002 | 29% | 0% |
| Jul 15 | 86°F | 63°F | 94°F 2006 | 53°F 2014 | 29% | 0% |
| Jul 16 | 86°F | 63°F | 96°F 2012 | 51°F 2014 | 29% | 0% |
| Jul 17 | 86°F | 63°F | 97°F 2012 | 52°F 2014 | 29% | 0% |
| Jul 18 | 86°F | 63°F | 96°F 2012 | 52°F 2003 | 29% | 0% |
| Jul 19 | 85°F | 63°F | 97°F 2011 | 50°F 2003 | 29% | 0% |
| Jul 20 | 85°F | 63°F | 97°F 2011 | 54°F 2009 | 29% | 0% |
| Jul 21 | 85°F | 63°F | 97°F 2011 | 52°F 2007 | 29% | 0% |
| Jul 22 | 85°F | 63°F | 94°F 2001 | 53°F 2000 | 30% | 0% |
| Jul 23 | 85°F | 63°F | 94°F 2025 | 48°F 2000 | 30% | 0% |
| Jul 24 | 85°F | 63°F | 100°F 2005 | 49°F 2000 | 30% | 0% |
| Jul 25 | 85°F | 63°F | 97°F 2012 | 53°F 2013 | 30% | 0% |
| Jul 26 | 85°F | 63°F | 96°F 1997 | 54°F 1998 | 30% | 0% |
| Jul 27 | 85°F | 63°F | 91°F 1997 | 53°F 2013 | 30% | 0% |
| Jul 28 | 85°F | 63°F | 93°F 2025 | 53°F 2013 | 30% | 0% |
| Jul 29 | 85°F | 63°F | 95°F 1999 | 52°F 1997 | 30% | 0% |
| Jul 30 | 84°F | 63°F | 98°F 1999 | 49°F 1997 | 30% | 0% |
| Jul 31 | 84°F | 63°F | 98°F 2006 | 50°F 1997 | 30% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- July 1
- sunrise 5:22 AM, sunset 8:31 PM
- July 31
- sunrise 5:46 AM, sunset 8:12 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00119221 (Wheaton 3 Se), public domain. Records: NOAA GHCN-Daily, station USW00094892, 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.