S
M
T
W
T
F
S
30
94°
61°
31
95°
60°
1
93°
59°
2
92°
59°
3
92°
60°
4
93°
60°
5
92°
61°
6
92°
61°
7
93°
62°
8
91°
61°
9
90°
62°
10
91°
63°
11
93°
62°
12
95°
62°
13
94°
63°
14
94°
65°
15
95°
64°
16
93°
64°
17
95°
63°
18
95°
61°
19
94°
63°
20
94°
65°
21
93°
65°
22
95°
64°
23
95°
64°
24
93°
61°
25
86°
58°
26
84°
57°
27
86°
59°
28
85°
61°
29
88°
58°
30
85°
56°
1
83°
57°
2
83°
59°
3
90°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in San Jacinto
San Jacinto's September 2026 forecast shows daily high temperatures ranging from 83° to 95°, with overnight lows between 56° and 65°. The average high for September is 91° with an average low of 61°. 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 San Jacinto. See also: October | November | December.
