Naperville climate

Naperville Weather in September

NOAA 1991-2020 normals for Wheaton 3 Se, 6.8 km from Naperville

Average highs run from 82°F on September 1 to 72°F on September 30, and lows from 60°F to 48°F. Normal precipitation for the month is 3.30 in over about 8 wet days.

September day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Naperville, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
78°F
Average low
54°F
Precipitation
3.30 in
Record high
95°FSep 2, 2008
Record low
32°FSep 24, 2012
Chance of a freeze
9%
Days of 90°F or more
2.4
Daylight
13 h 07 min to 11 h 47 min
Cloud cover
59%
Humidity
73%
Dew point
54°F
Wind
9.2 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.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Sep 182°F60°F93°F 202644°F 200927%0%
Sep 282°F59°F95°F 200843°F 201727%0%
Sep 382°F59°F91°F 202349°F 202427%0%
Sep 482°F59°F93°F 201244°F 202527%0%
Sep 582°F58°F92°F 199942°F 199727%0%
Sep 681°F58°F92°F 201641°F 200027%0%
Sep 781°F57°F90°F 201642°F 202527%0%
Sep 881°F57°F90°F 200244°F 202427%0%
Sep 981°F57°F90°F 201346°F 200827%0%
Sep 1080°F56°F92°F 200542°F 199927%0%
Sep 1180°F56°F91°F 200543°F 199927%0%
Sep 1280°F55°F90°F 200542°F 199727%0%
Sep 1379°F55°F94°F 200539°F 201427%0%
Sep 1479°F55°F89°F 202439°F 201127%0%
Sep 1579°F54°F89°F 202436°F 200727%0%
Sep 1678°F54°F89°F 201839°F 200027%0%
Sep 1778°F53°F92°F 201840°F 199927%0%
Sep 1877°F53°F88°F 200741°F 201228%0%
Sep 1977°F52°F90°F 202137°F 202028%0%
Sep 2077°F52°F93°F 201840°F 200328%0%
Sep 2176°F52°F92°F 201740°F 200628%0%
Sep 2276°F51°F94°F 201738°F 199928%0%
Sep 2375°F51°F94°F 201736°F 201228%0%
Sep 2475°F50°F91°F 200732°F 201228%0%
Sep 2575°F50°F92°F 201738°F 200128%0%
Sep 2674°F49°F91°F 201738°F 200028%0%
Sep 2774°F49°F88°F 202139°F 200128%0%
Sep 2873°F49°F84°F 201337°F 200028%0%
Sep 2973°F48°F90°F 202535°F 201828%0%
Sep 3072°F48°F86°F 201935°F 200428%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Naperville, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:19 AM, sunset 7:26 PM
September 30
sunrise 6:49 AM, sunset 6:36 PM

Every day of September: sun and moon

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.