S
M
T
W
T
F
S
30
108°
84°
31
109°
85°
1
108°
84°
2
109°
85°
3
105°
84°
4
102°
83°
5
101°
84°
6
101°
79°
7
99°
82°
8
101°
78°
9
101°
77°
10
100°
76°
11
100°
76°
12
99°
75°
13
99°
75°
14
100°
76°
15
99°
74°
16
98°
75°
17
99°
74°
18
98°
73°
19
97°
74°
20
97°
78°
21
98°
77°
22
98°
77°
23
101°
78°
24
97°
74°
25
Hist. Avg.
98°
74°
26
Hist. Avg.
98°
74°
27
Hist. Avg.
98°
74°
28
Hist. Avg.
97°
73°
29
Hist. Avg.
97°
73°
30
Hist. Avg.
96°
72°
1
Hist. Avg.
96°
72°
2
Hist. Avg.
96°
71°
3
Hist. Avg.
95°
71°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Winterhaven
Winterhaven's September 2026 forecast shows daily high temperatures ranging from 97° to 109°, with overnight lows between 73° and 85°. The average high for September is 101° with an average low of 78°. 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.
