Union climate

Union Weather in September

NOAA 1991-2020 normals for Cushman Powerhouse #2, 4.8 km from Union

Average highs run from 73°F on September 1 to 64°F on September 30, and lows from 52°F to 47°F. Normal precipitation for the month is 3.02 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.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
69°F
Average low
50°F
Precipitation
3.02 in
Record high
97°FSep 5, 2024
Record low
31°FSep 30, 2023
Chance of a freeze
0%
Daylight
13 h 20 min to 11 h 43 min
Cloud cover
51%
Humidity
80%
Dew point
49°F
Wind
3.6 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 173°F52°F90°F 199836°F 202122%0%
Sep 273°F52°F94°F 200638°F 199922%0%
Sep 373°F52°F95°F 201738°F 201123%0%
Sep 473°F52°F92°F 200338°F 200223%0%
Sep 572°F52°F97°F 202438°F 200223%0%
Sep 672°F52°F93°F 201439°F 200524%0%
Sep 772°F51°F92°F 201239°F 199924%0%
Sep 872°F51°F89°F 201140°F 200125%0%
Sep 971°F51°F93°F 202039°F 200725%0%
Sep 1071°F51°F93°F 202039°F 200625%0%
Sep 1171°F51°F94°F 201335°F 201226%0%
Sep 1271°F51°F85°F 199932°F 201226%0%
Sep 1370°F50°F89°F 199935°F 201227%0%
Sep 1470°F50°F88°F 199938°F 201427%0%
Sep 1570°F50°F90°F 201436°F 201728%0%
Sep 1670°F50°F89°F 202532°F 202128%0%
Sep 1769°F50°F84°F 201240°F 201229%0%
Sep 1869°F50°F86°F 201235°F 201829%0%
Sep 1969°F49°F87°F 199939°F 202230%0%
Sep 2068°F49°F86°F 199936°F 201130%0%
Sep 2168°F49°F84°F 199933°F 202330%0%
Sep 2268°F49°F89°F 200934°F 200531%0%
Sep 2367°F49°F81°F 200232°F 200832%0%
Sep 2467°F48°F82°F 200332°F 200532%0%
Sep 2566°F48°F84°F 202235°F 200533%0%
Sep 2666°F48°F89°F 202234°F 200533%0%
Sep 2766°F48°F91°F 200333°F 201534%0%
Sep 2865°F48°F87°F 201732°F 199934%0%
Sep 2965°F47°F83°F 200834°F 199935%0%
Sep 3064°F47°F77°F 202031°F 202336%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.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

September 1
sunrise 6:32 AM, sunset 7:52 PM
September 30
sunrise 7:10 AM, sunset 6:53 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00451939 (Cushman Powerhouse #2), public domain. Records: NOAA GHCN-Daily, station USW00094227, 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.