S
M
T
W
T
F
S
30
86°
62°
31
88°
69°
1
92°
72°
2
93°
69°
3
93°
72°
4
92°
69°
5
85°
66°
6
78°
63°
7
81°
58°
8
85°
61°
9
89°
71°
10
81°
65°
11
81°
61°
12
81°
67°
13
88°
61°
14
73°
51°
15
88°
55°
16
89°
70°
17
87°
68°
18
76°
65°
19
83°
62°
20
82°
69°
21
61°
56°
22
64°
56°
23
64°
58°
24
67°
48°
25
72°
42°
26
73°
45°
27
73°
45°
28
74°
46°
29
75°
53°
30
82°
59°
1
84°
63°
2
70°
53°
3
66°
53°
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 66° to 84°, with overnight lows between 53° and 63°. The average high for September is 75° with an average low of 56°. 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.
