S
M
T
W
T
F
S
30
86°
62°
31
85°
60°
1
82°
59°
2
81°
61°
3
81°
61°
4
82°
62°
5
87°
65°
6
81°
67°
7
87°
65°
8
85°
59°
9
79°
58°
10
79°
57°
11
78°
57°
12
79°
59°
13
78°
58°
14
77°
57°
15
78°
58°
16
77°
61°
17
78°
56°
18
79°
60°
19
82°
61°
20
81°
61°
21
Hist. Avg.
79°
58°
22
Hist. Avg.
79°
58°
23
Hist. Avg.
78°
57°
24
Hist. Avg.
78°
57°
25
Hist. Avg.
78°
56°
26
Hist. Avg.
77°
56°
27
Hist. Avg.
77°
56°
28
Hist. Avg.
76°
55°
29
Hist. Avg.
76°
55°
30
Hist. Avg.
76°
54°
1
Hist. Avg.
75°
54°
2
Hist. Avg.
75°
54°
3
Hist. Avg.
75°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Prospect
Prospect's September 2026 forecast shows daily high temperatures ranging from 77° to 87°, with overnight lows between 56° and 67°. The average high for September is 81° with an average low of 60°. 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 Prospect. See also: October | November | December.
