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Union, SC

78°F
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Union, SC Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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Today Hourly 10-Day Radar MinuteCast®

Monthly

Air Quality Health & Activities

September

January February March April May June July August September October November December

2026

2025 2026 2027

10-Day

S
M
T
W
T
F
S
30
88°
71°
31
91°
68°
1
94°
71°
2
Mostly sunny and very hot
96°
72°
3
Mostly sunny and hot
95°
72°
4
Sweltering heat
96°
72°
5
Very hot; a p.m. t-storm
97°
70°
6
Humid with a t-storm in spots
87°
69°
7
Cloudy and humid
85°
65°
8
Sunny and less humid
85°
66°
9
Clouds and sun
88°
65°
10
Mostly sunny and warm
92°
68°
11
A couple of afternoon showers
92°
68°
12
Humid; a little p.m. rain
88°
66°
13
Humid; a p.m. t-storm or two
88°
64°
14
A little afternoon rain
89°
67°
15
A shower and thunderstorm
87°
61°
16
A shower and t-storm; humid
79°
64°
17
Mostly cloudy
78°
63°
18
Cloudy
77°
63°
19
Cloudy and humid
78°
64°
20
Occasional afternoon rain
78°
64°
21
Cloudy, a shower; humid
79°
63°
22
Occasional morning rain
79°
64°
23
Sunshine and humid
82°
63°
24
Cloudy
78°
62°
25
Cloudy with a shower; humid
76°
62°
26
A little morning rain
78°
61°
27
Humid with clouds and sun
81°
59°
28
Sunny and less humid
79°
52°
29
Plenty of sunshine
73°
51°
30
Mostly sunny
73°
51°
1
Plenty of sun
74°
54°
2
Partly sunny
74°
58°
3
Cloudy with thunderstorms
72°
57°

Temperature Graph

°F
100° 90° 80° 70° 60° Sep
Today 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo

September Weather in Union

Union's September 2026 forecast shows daily high temperatures ranging from 72° to 97°, with overnight lows between 51° and 72°. The average high for September is 83° with an average low of 63°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Union. See also: October | November | December.

Further Ahead

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November 2026

December 2026

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World North America United States South Carolina Union

Weather Near Union:

  • Asheville, NC
  • Greenville, SC
  • Spartanburg, SC
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