S
M
T
W
T
F
S
30
107°
88°
31
104°
88°
1
105°
85°
2
105°
82°
3
103°
80°
4
104°
80°
5
98°
84°
6
99°
84°
7
101°
81°
8
104°
83°
9
102°
82°
10
101°
80°
11
98°
77°
12
98°
77°
13
100°
80°
14
103°
79°
15
103°
79°
16
102°
78°
17
106°
82°
18
101°
75°
19
100°
77°
20
100°
78°
21
101°
80°
22
103°
80°
23
102°
79°
24
100°
77°
25
101°
79°
26
101°
79°
27
100°
78°
28
99°
78°
29
100°
77°
30
99°
76°
1
100°
77°
2
100°
77°
3
99°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Winterhaven
Winterhaven's September 2026 forecast shows daily high temperatures ranging from 98° to 106°, with overnight lows between 75° and 84°. The average high for September is 101° with an average low of 79°. 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 Winterhaven. See also: October | November | December.
