S
M
T
W
T
F
S
30
81°
57°
31
82°
58°
1
85°
59°
2
83°
60°
3
80°
62°
4
85°
61°
5
85°
62°
6
84°
62°
7
83°
56°
8
79°
58°
9
82°
61°
10
82°
61°
11
81°
60°
12
83°
61°
13
83°
55°
14
77°
53°
15
77°
53°
16
78°
54°
17
77°
57°
18
81°
59°
19
82°
58°
20
81°
59°
21
75°
57°
22
80°
58°
23
79°
58°
24
80°
51°
25
74°
50°
26
72°
49°
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 72° to 85°, with overnight lows between 49° and 62°. The average high for September is 80° with an average low of 57°. 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.
