S
M
T
W
T
F
S
30
65°
51°
31
64°
51°
1
65°
50°
2
65°
52°
3
64°
50°
4
64°
48°
5
63°
46°
6
65°
47°
7
66°
51°
8
67°
52°
9
61°
50°
10
61°
45°
11
64°
46°
12
68°
52°
13
69°
53°
14
68°
53°
15
65°
46°
16
67°
46°
17
62°
49°
18
62°
53°
19
63°
53°
20
69°
46°
21
67°
47°
22
63°
45°
23
64°
49°
24
63°
49°
25
69°
47°
26
64°
48°
27
64°
52°
28
65°
47°
29
64°
47°
30
64°
48°
1
65°
48°
2
67°
49°
3
66°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Reservoir
Reservoir's September 2026 forecast shows daily high temperatures ranging from 61° to 69°, with overnight lows between 45° and 53°. The average high for September is 65° with an average low of 49°. 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 Reservoir. See also: October | November | December.
