S
M
T
W
T
F
S
30
93°
68°
31
91°
65°
1
90°
67°
2
92°
68°
3
93°
69°
4
93°
68°
5
92°
67°
6
91°
60°
7
84°
60°
8
83°
59°
9
83°
60°
10
88°
65°
11
88°
65°
12
87°
64°
13
82°
63°
14
81°
66°
15
88°
57°
16
88°
56°
17
79°
56°
18
78°
57°
19
78°
55°
20
77°
54°
21
76°
55°
22
77°
54°
23
77°
54°
24
78°
56°
25
78°
60°
26
81°
60°
27
83°
59°
28
82°
61°
29
83°
52°
30
83°
52°
1
76°
55°
2
75°
50°
3
74°
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 74° to 93°, with overnight lows between 50° and 69°. The average high for September is 83° 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.
