S
M
T
W
T
F
S
30
72°
59°
31
70°
55°
1
72°
52°
2
66°
57°
3
79°
64°
4
68°
57°
5
70°
54°
6
79°
52°
7
72°
59°
8
64°
54°
9
64°
52°
10
68°
50°
11
70°
55°
12
73°
50°
13
70°
58°
14
69°
57°
15
64°
48°
16
60°
48°
17
60°
45°
18
59°
50°
19
69°
52°
20
67°
53°
21
68°
50°
22
68°
52°
23
67°
53°
24
68°
53°
25
69°
51°
26
65°
50°
27
66°
49°
28
65°
50°
29
65°
49°
30
64°
47°
1
64°
46°
2
63°
48°
3
64°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St Ives
St Ives's September 2026 forecast shows daily high temperatures ranging from 59° to 70°, with overnight lows between 45° and 58°. The average high for September is 65° with an average low of 50°. 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 St Ives. See also: October | November | December.
