S
M
T
W
T
F
S
30
72°
47°
31
73°
52°
1
71°
52°
2
64°
51°
3
69°
50°
4
71°
50°
5
75°
51°
6
78°
52°
7
77°
51°
8
77°
52°
9
85°
50°
10
69°
43°
11
68°
44°
12
67°
49°
13
68°
45°
14
68°
42°
15
72°
47°
16
71°
47°
17
67°
46°
18
66°
45°
19
66°
42°
20
67°
41°
21
68°
41°
22
66°
42°
23
72°
42°
24
73°
45°
25
72°
47°
26
64°
42°
27
63°
42°
28
62°
43°
29
62°
41°
30
61°
44°
1
61°
42°
2
62°
43°
3
60°
41°
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 60° to 85°, with overnight lows between 41° and 52°. The average high for September is 69° with an average low of 46°. 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.
