S
M
T
W
T
F
S
30
89°
69°
31
90°
70°
1
93°
66°
2
89°
67°
3
94°
72°
4
91°
70°
5
73°
70°
6
90°
68°
7
N/A
8
89°
68°
9
89°
69°
10
88°
67°
11
79°
65°
12
84°
61°
13
86°
63°
14
87°
66°
15
83°
65°
16
82°
58°
17
82°
61°
18
79°
59°
19
78°
57°
20
76°
55°
21
83°
60°
22
78°
59°
23
81°
59°
24
82°
60°
25
82°
60°
26
81°
59°
27
82°
59°
28
81°
58°
29
81°
59°
30
80°
59°
1
80°
57°
2
77°
50°
3
68°
46°
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 89°, with overnight lows between 46° and 69°. The average high for September is 81° with an average low of 60°. 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.
