S
M
T
W
T
F
S
30
67°
50°
31
72°
51°
1
80°
53°
2
83°
63°
3
84°
63°
4
82°
56°
5
90°
58°
6
90°
60°
7
72°
57°
8
73°
53°
9
65°
50°
10
66°
51°
11
67°
51°
12
70°
51°
13
75°
55°
14
82°
57°
15
82°
58°
16
73°
53°
17
63°
49°
18
73°
48°
19
85°
54°
20
89°
60°
21
91°
59°
22
N/A
23
69°
62°
24
73°
58°
25
78°
61°
26
83°
61°
27
66°
58°
28
67°
54°
29
73°
58°
30
77°
61°
1
77°
63°
2
68°
60°
3
69°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St Ives
St Ives's September 2026 forecast shows daily high temperatures ranging from 66° to 83°, with overnight lows between 54° and 63°. The average high for September is 73° 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 St Ives. See also: October | November | December.
