S
M
T
W
T
F
S
30
78°
59°
31
80°
58°
1
82°
62°
2
82°
63°
3
83°
62°
4
80°
62°
5
78°
61°
6
76°
57°
7
79°
57°
8
77°
61°
9
80°
60°
10
81°
61°
11
82°
61°
12
81°
60°
13
80°
60°
14
79°
58°
15
80°
59°
16
81°
60°
17
Hist. Avg.
80°
56°
18
Hist. Avg.
80°
55°
19
Hist. Avg.
79°
55°
20
Hist. Avg.
79°
54°
21
Hist. Avg.
79°
54°
22
Hist. Avg.
78°
54°
23
Hist. Avg.
78°
53°
24
Hist. Avg.
78°
53°
25
Hist. Avg.
77°
52°
26
Hist. Avg.
77°
52°
27
Hist. Avg.
76°
51°
28
Hist. Avg.
76°
51°
29
Hist. Avg.
76°
51°
30
Hist. Avg.
75°
50°
1
Hist. Avg.
75°
50°
2
Hist. Avg.
75°
49°
3
Hist. Avg.
74°
49°
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 76° to 83°, with overnight lows between 57° and 63°. The average high for September is 80° 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.
