S
M
T
W
T
F
S
30
79°
56°
31
80°
56°
1
80°
49°
2
74°
47°
3
71°
55°
4
71°
56°
5
80°
45°
6
74°
42°
7
68°
44°
8
68°
52°
9
70°
53°
10
76°
54°
11
75°
53°
12
77°
46°
13
72°
42°
14
67°
39°
15
64°
42°
16
66°
41°
17
70°
49°
18
74°
38°
19
66°
40°
20
64°
49°
21
69°
51°
22
75°
45°
23
72°
50°
24
72°
50°
25
73°
48°
26
74°
41°
27
70°
39°
28
60°
41°
29
59°
44°
30
58°
41°
1
61°
43°
2
59°
47°
3
56°
34°
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 56° to 80°, with overnight lows between 34° and 56°. The average high for September is 70° with an average low of 46°. 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.
