S
M
T
W
T
F
S
30
79°
50°
31
80°
54°
1
81°
53°
2
81°
53°
3
80°
46°
4
79°
47°
5
79°
54°
6
78°
51°
7
80°
51°
8
77°
43°
9
71°
48°
10
73°
42°
11
76°
43°
12
73°
44°
13
69°
44°
14
69°
42°
15
70°
40°
16
69°
42°
17
68°
46°
18
67°
42°
19
68°
43°
20
67°
46°
21
71°
43°
22
72°
41°
23
Hist. Avg.
70°
45°
24
Hist. Avg.
70°
45°
25
Hist. Avg.
69°
44°
26
Hist. Avg.
69°
44°
27
Hist. Avg.
68°
44°
28
Hist. Avg.
68°
44°
29
Hist. Avg.
67°
44°
30
Hist. Avg.
67°
44°
1
Hist. Avg.
66°
43°
2
Hist. Avg.
66°
43°
3
Hist. Avg.
66°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Olympia
Olympia's September 2026 forecast shows daily high temperatures ranging from 67° to 81°, with overnight lows between 40° and 54°. The average high for September is 74° 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.
