S
M
T
W
T
F
S
30
88°
55°
31
82°
55°
1
73°
50°
2
77°
48°
3
77°
50°
4
73°
59°
5
81°
54°
6
81°
52°
7
84°
54°
8
93°
55°
9
99°
63°
10
99°
64°
11
93°
59°
12
88°
57°
13
77°
50°
14
82°
48°
15
84°
52°
16
79°
54°
17
73°
48°
18
79°
48°
19
86°
59°
20
87°
58°
21
82°
58°
22
86°
60°
23
90°
62°
24
95°
57°
25
89°
55°
26
89°
56°
27
87°
54°
28
86°
53°
29
86°
52°
30
83°
53°
1
83°
51°
2
81°
47°
3
84°
51°
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 81° to 95°, with overnight lows between 47° and 62°. The average high for September is 86° with an average low of 55°. 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.
