S
M
T
W
T
F
S
30
93°
67°
31
94°
68°
1
95°
71°
2
94°
70°
3
92°
69°
4
88°
68°
5
91°
69°
6
92°
69°
7
94°
68°
8
93°
69°
9
93°
69°
10
92°
68°
11
92°
69°
12
91°
68°
13
91°
65°
14
85°
63°
15
84°
62°
16
85°
62°
17
89°
66°
18
89°
65°
19
84°
65°
20
83°
66°
21
90°
66°
22
89°
65°
23
87°
58°
24
88°
59°
25
81°
58°
26
82°
56°
27
87°
64°
28
87°
64°
29
88°
64°
30
Hist. Avg.
81°
59°
1
Hist. Avg.
81°
58°
2
Hist. Avg.
80°
58°
3
Hist. Avg.
80°
58°
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 81° to 95°, with overnight lows between 56° and 71°. The average high for September is 89° with an average low of 65°. 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.
