Union climate

Union Weather in September

NOAA 1991-2020 normals for Southbridge 3 Sw, 10.3 km from Union

Average highs run from 77°F on September 1 to 65°F on September 30, and lows from 57°F to 45°F. Normal precipitation for the month is 4.24 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 Union, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
72°F
Average low
51°F
Precipitation
4.24 in
Record high
96°FSep 8, 2015
Record low
30°FSep 22, 2020
Chance of a freeze
5%
Daylight
13 h 08 min to 11 h 47 min
Cloud cover
55%
Humidity
74%
Dew point
54°F
Wind
4.0 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 177°F57°F92°F 201046°F 199932%0%
Sep 277°F56°F92°F 201039°F 201732%0%
Sep 377°F56°F92°F 201546°F 202432%0%
Sep 477°F56°F90°F 201846°F 202432%0%
Sep 576°F55°F89°F 202343°F 199732%0%
Sep 676°F55°F92°F 201843°F 201332%0%
Sep 776°F55°F92°F 202344°F 200032%0%
Sep 875°F54°F96°F 201545°F 202532%0%
Sep 975°F54°F93°F 201642°F 201332%0%
Sep 1075°F54°F89°F 201641°F 200332%0%
Sep 1174°F53°F92°F 201342°F 200532%0%
Sep 1274°F53°F90°F 200538°F 200632%0%
Sep 1374°F52°F89°F 200542°F 200233%0%
Sep 1473°F52°F90°F 201645°F 201433%0%
Sep 1573°F52°F84°F 201741°F 202033%0%
Sep 1672°F51°F85°F 201539°F 201033%0%
Sep 1772°F51°F87°F 201538°F 200733%0%
Sep 1871°F50°F85°F 201537°F 201333%0%
Sep 1971°F50°F82°F 200537°F 201934%0%
Sep 2070°F49°F84°F 201634°F 202034%0%
Sep 2170°F49°F84°F 201631°F 202034%0%
Sep 2269°F48°F85°F 201630°F 202034%0%
Sep 2369°F48°F87°F 201739°F 201435%0%
Sep 2468°F48°F92°F 201735°F 199835%0%
Sep 2568°F47°F90°F 201734°F 199735%0%
Sep 2667°F47°F87°F 200737°F 201636%0%
Sep 2767°F46°F88°F 201738°F 201536%0%
Sep 2866°F46°F84°F 201437°F 200036%0%
Sep 2966°F45°F83°F 201531°F 200036%0%
Sep 3065°F45°F79°F 202533°F 200036%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 (EDT).

September 1
sunrise 6:14 AM, sunset 7:22 PM
September 30
sunrise 6:45 AM, sunset 6:32 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00197627 (Southbridge 3 Sw), public domain. Records: NOAA GHCN-Daily, station USW00054767, 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.