Union climate

Union Weather in September

NOAA 1991-2020 normals for Union, 0.7 km from Union

Average highs run from 87°F on September 1 to 76°F on September 30, and lows from 63°F to 51°F. Normal precipitation for the month is 3.63 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 Union, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
82°F
Average low
57°F
Precipitation
3.63 in
Record high
101°FSep 6, 2026
Record low
36°FSep 23, 2012
Chance of a freeze
3%
Days of 90°F or more
5.3
Daylight
13 h 00 min to 11 h 49 min
Cloud cover
46%
Humidity
69%
Dew point
56°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 187°F63°F99°F 201148°F 200926%0%
Sep 287°F62°F100°F 201148°F 200926%0%
Sep 386°F62°F99°F 202650°F 201726%0%
Sep 486°F62°F98°F 202651°F 201026%0%
Sep 586°F61°F98°F 202650°F 201025%0%
Sep 685°F61°F101°F 202648°F 201725%0%
Sep 785°F61°F93°F 201645°F 201725%0%
Sep 885°F60°F93°F 201341°F 202425%0%
Sep 984°F60°F91°F 202642°F 202425%0%
Sep 1084°F59°F96°F 201344°F 202425%0%
Sep 1184°F59°F96°F 201346°F 202425%0%
Sep 1283°F59°F94°F 201349°F 201725%0%
Sep 1383°F58°F94°F 202543°F 201425%0%
Sep 1482°F58°F96°F 202542°F 201425%0%
Sep 1582°F57°F97°F 202542°F 201425%0%
Sep 1682°F57°F98°F 202645°F 201125%0%
Sep 1781°F56°F93°F 201949°F 201425%0%
Sep 1881°F56°F97°F 202648°F 202325%0%
Sep 1981°F56°F94°F 201842°F 201225%0%
Sep 2080°F55°F95°F 202243°F 202025%0%
Sep 2180°F55°F96°F 202241°F 201525%0%
Sep 2279°F54°F94°F 202245°F 202025%0%
Sep 2379°F54°F95°F 201736°F 201225%0%
Sep 2479°F53°F91°F 201736°F 201225%0%
Sep 2578°F53°F91°F 201739°F 201225%0%
Sep 2678°F53°F89°F 201641°F 201125%0%
Sep 2777°F52°F90°F 202342°F 202225%0%
Sep 2877°F52°F91°F 202142°F 202225%0%
Sep 2977°F51°F89°F 202140°F 202224%0%
Sep 3076°F51°F89°F 201940°F 202224%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Union, 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 6:34 AM, sunset 7:34 PM
September 30
sunrise 6:59 AM, sunset 6:48 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00238515 (Union), public domain. Records: NOAA GHCN-Daily, station USC00238746, 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.