S
M
T
W
T
F
S
30
78°
63°
31
83°
54°
1
78°
54°
2
80°
61°
3
85°
63°
4
86°
67°
5
90°
61°
6
76°
58°
7
70°
60°
8
74°
56°
9
75°
54°
10
76°
51°
11
73°
50°
12
73°
49°
13
74°
50°
14
61°
46°
15
76°
53°
16
74°
53°
17
75°
52°
18
75°
53°
19
74°
52°
20
75°
53°
21
75°
51°
22
74°
51°
23
74°
53°
24
76°
54°
25
75°
53°
26
75°
52°
27
74°
51°
28
74°
51°
29
73°
50°
30
72°
51°
1
72°
50°
2
70°
48°
3
69°
48°
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 61° to 90°, with overnight lows between 46° and 67°. The average high for September is 75° with an average low of 53°. 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.
