S
M
T
W
T
F
S
30
74°
65°
31
73°
66°
1
79°
64°
2
75°
63°
3
77°
61°
4
74°
60°
5
72°
60°
6
76°
64°
7
78°
64°
8
78°
65°
9
77°
64°
10
76°
64°
11
76°
63°
12
78°
64°
13
77°
64°
14
77°
63°
15
76°
63°
16
77°
58°
17
75°
60°
18
68°
62°
19
74°
61°
20
76°
62°
21
74°
61°
22
75°
56°
23
73°
59°
24
68°
60°
25
Hist. Avg.
70°
56°
26
Hist. Avg.
70°
56°
27
Hist. Avg.
69°
56°
28
Hist. Avg.
69°
55°
29
Hist. Avg.
69°
55°
30
Hist. Avg.
68°
55°
1
Hist. Avg.
68°
54°
2
Hist. Avg.
68°
54°
3
Hist. Avg.
67°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Jamestown
Jamestown's September 2026 forecast shows daily high temperatures ranging from 68° to 79°, with overnight lows between 56° and 66°. The average high for September is 75° with an average low of 62°. 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.
