S
M
T
W
T
F
S
30
74°
48°
31
80°
46°
1
67°
50°
2
66°
52°
3
66°
52°
4
70°
49°
5
71°
46°
6
77°
46°
7
72°
50°
8
76°
44°
9
82°
45°
10
71°
49°
11
68°
44°
12
67°
48°
13
64°
54°
14
69°
49°
15
68°
48°
16
77°
41°
17
80°
42°
18
70°
43°
19
68°
41°
20
73°
44°
21
71°
45°
22
72°
47°
23
68°
43°
24
65°
44°
25
58°
49°
26
64°
40°
27
68°
37°
28
67°
34°
29
61°
51°
30
66°
45°
1
71°
43°
2
73°
46°
3
70°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Olympia
Olympia's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Olympia. See also: October | November | December.
