Northbrook climate

Northbrook Weather in September

NOAA 1991-2020 normals for Cheviot, 10.8 km from Northbrook

Average highs run from 83°F on September 1 to 73°F on September 30, and lows from 62°F to 51°F. Normal precipitation for the month is 3.32 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 Northbrook, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
78°F
Average low
57°F
Precipitation
3.32 in
Record high
100°FSep 2, 2011
Record low
34°FSep 22, 1999
Chance of a freeze
1%
Days of 90°F or more
2.7
Daylight
13 h 02 min to 11 h 48 min
Cloud cover
48%
Humidity
67%
Dew point
55°F
Wind
4.3 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.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Sep 183°F62°F99°F 201146°F 202524%0%
Sep 283°F61°F100°F 201147°F 200924%0%
Sep 382°F61°F97°F 201149°F 199724%0%
Sep 482°F61°F97°F 200747°F 201024%0%
Sep 582°F61°F97°F 200741°F 201024%0%
Sep 682°F60°F96°F 199846°F 202524%0%
Sep 781°F60°F96°F 201046°F 201724%0%
Sep 881°F60°F96°F 200239°F 202424%0%
Sep 981°F59°F96°F 200240°F 202424%0%
Sep 1080°F59°F96°F 201344°F 199825%0%
Sep 1180°F59°F94°F 201343°F 199925%0%
Sep 1280°F58°F94°F 199947°F 200225%0%
Sep 1379°F58°F93°F 199843°F 200925%0%
Sep 1479°F58°F95°F 199840°F 201325%0%
Sep 1579°F57°F92°F 202440°F 201125%0%
Sep 1678°F57°F91°F 202638°F 200725%0%
Sep 1778°F56°F92°F 202640°F 199925%0%
Sep 1878°F56°F91°F 202142°F 199925%0%
Sep 1977°F56°F94°F 202438°F 201226%0%
Sep 2077°F55°F95°F 202435°F 202026%0%
Sep 2176°F55°F96°F 202439°F 200626%0%
Sep 2276°F55°F95°F 201034°F 199926%0%
Sep 2376°F54°F95°F 201035°F 201226%0%
Sep 2475°F54°F96°F 200734°F 201226%0%
Sep 2575°F53°F91°F 200737°F 199726%0%
Sep 2674°F53°F90°F 201741°F 202126%0%
Sep 2774°F53°F92°F 201938°F 200026%0%
Sep 2874°F52°F92°F 201937°F 200126%0%
Sep 2973°F52°F91°F 201937°F 200026%0%
Sep 3073°F51°F95°F 201936°F 200326%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Northbrook, 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 (EDT).

September 1
sunrise 7:07 AM, sunset 8:09 PM
September 30
sunrise 7:34 AM, sunset 7:22 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00331515 (Cheviot), public domain. Records: NOAA GHCN-Daily, station USW00053855, 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.