S
M
T
W
T
F
S
30
72°
64°
31
80°
65°
1
87°
71°
2
88°
69°
3
83°
66°
4
75°
66°
5
77°
57°
6
76°
53°
7
75°
51°
8
78°
55°
9
85°
68°
10
80°
65°
11
75°
57°
12
75°
67°
13
79°
55°
14
68°
52°
15
78°
66°
16
77°
65°
17
78°
61°
18
74°
59°
19
71°
53°
20
65°
50°
21
65°
51°
22
67°
49°
23
68°
48°
24
67°
47°
25
68°
47°
26
71°
52°
27
73°
53°
28
74°
52°
29
72°
51°
30
69°
51°
1
71°
52°
2
72°
50°
3
67°
50°
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 65° to 79°, with overnight lows between 47° and 67°. The average high for September is 71° with an average low of 54°. 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.
