S
M
T
W
T
F
S
30
93°
70°
31
93°
70°
1
92°
69°
2
93°
71°
3
94°
70°
4
92°
70°
5
92°
69°
6
92°
69°
7
91°
64°
8
87°
64°
9
87°
64°
10
91°
66°
11
91°
67°
12
92°
66°
13
91°
67°
14
90°
68°
15
89°
67°
16
89°
64°
17
86°
62°
18
84°
66°
19
84°
61°
20
86°
60°
21
83°
59°
22
80°
59°
23
82°
60°
24
83°
64°
25
82°
64°
26
83°
63°
27
86°
64°
28
84°
64°
29
85°
63°
30
85°
63°
1
86°
62°
2
85°
56°
3
80°
57°
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 80° to 94°, with overnight lows between 56° and 71°. The average high for September is 88° 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.
