S
M
T
W
T
F
S
30
86°
68°
31
92°
68°
1
96°
72°
2
97°
73°
3
97°
73°
4
97°
74°
5
95°
71°
6
83°
71°
7
83°
67°
8
83°
63°
9
87°
67°
10
91°
69°
11
88°
72°
12
81°
70°
13
88°
70°
14
90°
71°
15
90°
69°
16
88°
70°
17
83°
68°
18
83°
64°
19
80°
60°
20
78°
58°
21
79°
60°
22
79°
60°
23
83°
64°
24
80°
64°
25
81°
59°
26
80°
58°
27
83°
62°
28
84°
63°
29
83°
63°
30
83°
62°
1
82°
61°
2
82°
60°
3
81°
61°
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 78° to 91°, with overnight lows between 58° and 72°. The average high for September is 83° with an average low of 64°. 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.
