S
M
T
W
T
F
S
30
68°
60°
31
67°
59°
1
67°
59°
2
66°
58°
3
67°
56°
4
66°
54°
5
62°
58°
6
64°
59°
7
66°
57°
8
65°
59°
9
66°
58°
10
66°
57°
11
65°
56°
12
65°
57°
13
66°
53°
14
64°
58°
15
64°
54°
16
63°
53°
17
61°
52°
18
61°
58°
19
63°
56°
20
62°
55°
21
61°
52°
22
60°
53°
23
62°
54°
24
61°
55°
25
61°
53°
26
62°
55°
27
62°
57°
28
Hist. Avg.
60°
50°
29
Hist. Avg.
60°
50°
30
Hist. Avg.
60°
50°
1
Hist. Avg.
59°
50°
2
Hist. Avg.
59°
50°
3
Hist. Avg.
59°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St Erth
St Erth's September 2026 forecast shows daily high temperatures ranging from 60° to 68°, with overnight lows between 52° and 60°. The average high for September is 64° with an average low of 56°. 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 Erth. See also: October | November | December.
