S
M
T
W
T
F
S
30
92°
71°
31
92°
70°
1
91°
71°
2
87°
71°
3
88°
70°
4
87°
70°
5
88°
69°
6
90°
70°
7
89°
69°
8
85°
66°
9
86°
65°
10
85°
65°
11
85°
67°
12
87°
68°
13
88°
68°
14
89°
63°
15
88°
62°
16
84°
63°
17
83°
62°
18
85°
63°
19
87°
63°
20
87°
62°
21
86°
65°
22
86°
66°
23
87°
63°
24
85°
60°
25
83°
59°
26
83°
59°
27
84°
63°
28
85°
63°
29
85°
62°
30
86°
62°
1
85°
61°
2
84°
63°
3
85°
62°
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 83° to 92°, with overnight lows between 59° and 71°. The average high for September is 86° with an average low of 65°. 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.
