S
M
T
W
T
F
S
30
90°
56°
31
92°
58°
1
92°
58°
2
93°
57°
3
92°
56°
4
92°
58°
5
91°
57°
6
91°
58°
7
92°
58°
8
92°
55°
9
89°
56°
10
85°
57°
11
90°
58°
12
86°
56°
13
85°
55°
14
82°
52°
15
84°
52°
16
89°
52°
17
89°
56°
18
89°
55°
19
Hist. Avg.
86°
54°
20
Hist. Avg.
86°
53°
21
Hist. Avg.
86°
53°
22
Hist. Avg.
86°
53°
23
Hist. Avg.
85°
53°
24
Hist. Avg.
85°
53°
25
Hist. Avg.
85°
53°
26
Hist. Avg.
85°
53°
27
Hist. Avg.
84°
52°
28
Hist. Avg.
84°
52°
29
Hist. Avg.
84°
52°
30
Hist. Avg.
84°
52°
1
Hist. Avg.
83°
52°
2
Hist. Avg.
83°
52°
3
Hist. Avg.
83°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St. Helena
St. Helena's September 2026 forecast shows daily high temperatures ranging from 82° to 93°, with overnight lows between 52° and 58°. The average high for September is 89° 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. Helena. See also: October | November | December.
