Lake Bluff climate

Lake Bluff Weather in September

NOAA 1991-2020 normals for Chicago Botanic Garden, 16 km from Lake Bluff

Average highs run from 80°F on September 1 to 70°F on September 30, and lows from 60°F to 49°F. Normal precipitation for the month is 3.56 in over about 10 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 Lake Bluff, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
75°F
Average low
55°F
Precipitation
3.56 in
Record high
96°FSep 10, 2013
Record low
34°FSep 19, 2012
Chance of a freeze
4%
Days of 90°F or more
1.7
Daylight
13 h 08 min to 11 h 47 min
Cloud cover
59%
Humidity
74%
Dew point
54°F
Wind
9.6 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 180°F60°F93°F 202643°F 200932%0%
Sep 280°F60°F93°F 202644°F 201732%0%
Sep 379°F60°F94°F 202349°F 200932%0%
Sep 479°F59°F91°F 202345°F 200932%0%
Sep 579°F59°F92°F 202345°F 200332%0%
Sep 679°F59°F93°F 201645°F 202532%0%
Sep 778°F58°F88°F 200145°F 202532%0%
Sep 878°F58°F84°F 200245°F 202432%0%
Sep 978°F58°F91°F 201345°F 200832%0%
Sep 1077°F57°F96°F 201343°F 200832%0%
Sep 1177°F57°F91°F 200544°F 201733%0%
Sep 1277°F56°F90°F 200542°F 201433%0%
Sep 1376°F56°F93°F 200539°F 201433%0%
Sep 1476°F56°F86°F 202140°F 201133%0%
Sep 1576°F55°F86°F 200435°F 201233%0%
Sep 1675°F55°F84°F 201641°F 200733%0%
Sep 1775°F54°F91°F 202142°F 201433%0%
Sep 1875°F54°F87°F 200740°F 201233%0%
Sep 1974°F53°F88°F 201634°F 201233%0%
Sep 2074°F53°F89°F 202440°F 200333%0%
Sep 2173°F53°F88°F 201037°F 200634%0%
Sep 2273°F52°F92°F 201740°F 199934%0%
Sep 2373°F52°F88°F 201036°F 201234%0%
Sep 2472°F51°F89°F 200735°F 201234%0%
Sep 2572°F51°F85°F 200738°F 200134%0%
Sep 2671°F50°F90°F 201740°F 200434%0%
Sep 2771°F50°F89°F 202541°F 201234%0%
Sep 2871°F49°F82°F 201339°F 200634%0%
Sep 2970°F49°F88°F 202535°F 201834%0%
Sep 3070°F49°F85°F 201935°F 200435%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Lake Bluff, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:17 AM, sunset 7:25 PM
September 30
sunrise 6:47 AM, sunset 6:34 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00111497 (Chicago Botanic Garden), public domain. Records: NOAA GHCN-Daily, station USW00014880, 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.