S
M
T
W
T
F
S
26
88°
72°
27
91°
69°
28
90°
68°
29
90°
68°
30
92°
69°
31
94°
73°
1
95°
72°
2
94°
72°
3
90°
71°
4
94°
68°
5
90°
71°
6
90°
71°
7
89°
72°
8
89°
72°
9
90°
71°
10
89°
72°
11
90°
72°
12
90°
71°
13
91°
73°
14
91°
69°
15
93°
67°
16
92°
69°
17
94°
72°
18
95°
71°
19
92°
69°
20
90°
67°
21
89°
68°
22
91°
70°
23
93°
71°
24
91°
71°
25
90°
70°
26
93°
71°
27
94°
72°
28
94°
71°
29
93°
70°
30
93°
65°
31
92°
65°
1
90°
69°
2
92°
69°
3
92°
68°
4
91°
68°
5
90°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Union
Union's August 2026 forecast shows daily high temperatures ranging from 88° to 95°, with overnight lows between 65° and 73°. The average high for August is 91° with an average low of 70°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Union. See also: September | October | November.
