S
M
T
W
T
F
S
30
64°
53°
31
67°
51°
1
67°
52°
2
60°
54°
3
63°
51°
4
63°
50°
5
65°
52°
6
67°
46°
7
64°
51°
8
68°
48°
9
71°
50°
10
64°
54°
11
62°
52°
12
62°
49°
13
63°
55°
14
63°
54°
15
66°
54°
16
71°
54°
17
69°
55°
18
69°
56°
19
66°
53°
20
63°
54°
21
62°
53°
22
61°
51°
23
60°
53°
24
61°
51°
25
60°
52°
26
64°
48°
27
60°
49°
28
60°
50°
29
60°
51°
30
59°
48°
1
59°
50°
2
60°
48°
3
58°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Olympic National Park
Olympic National Park's September 2026 forecast shows daily high temperatures ranging from 58° to 71°, with overnight lows between 46° and 56°. The average high for September is 63° with an average low of 52°. 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 Olympic National Park. See also: October | November | December.
