S
M
T
W
T
F
S
30
72°
45°
31
72°
52°
1
74°
46°
2
71°
46°
3
72°
45°
4
76°
51°
5
70°
43°
6
71°
43°
7
71°
44°
8
72°
43°
9
70°
45°
10
71°
44°
11
71°
47°
12
72°
44°
13
77°
43°
14
76°
45°
15
75°
50°
16
77°
52°
17
77°
50°
18
76°
43°
19
71°
41°
20
74°
47°
21
73°
42°
22
69°
42°
23
69°
48°
24
65°
48°
25
63°
42°
26
63°
45°
27
64°
41°
28
62°
41°
29
62°
47°
30
61°
50°
1
62°
47°
2
64°
39°
3
62°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Tumwater
Tumwater's September 2026 forecast shows daily high temperatures ranging from 61° to 77°, with overnight lows between 38° and 52°. The average high for September is 70° with an average low of 45°. 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 Tumwater. See also: October | November | December.
