S
M
T
W
T
F
S
30
72°
51°
31
71°
52°
1
72°
51°
2
76°
55°
3
79°
48°
4
75°
53°
5
71°
51°
6
73°
48°
7
71°
46°
8
75°
47°
9
74°
50°
10
77°
53°
11
77°
44°
12
73°
45°
13
68°
49°
14
69°
54°
15
72°
41°
16
78°
41°
17
66°
40°
18
63°
39°
19
63°
40°
20
64°
45°
21
66°
40°
22
68°
39°
23
62°
38°
24
61°
36°
25
61°
37°
26
62°
39°
27
62°
38°
28
61°
41°
29
60°
37°
30
63°
39°
1
65°
35°
2
60°
42°
3
Hist. Avg.
62°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Jamestown
Jamestown's September 2026 forecast shows daily high temperatures ranging from 60° to 79°, with overnight lows between 35° and 55°. The average high for September is 69° with an average low of 44°. 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 Jamestown. See also: October | November | December.
