S
M
T
W
T
F
S
30
93°
65°
31
94°
71°
1
96°
71°
2
97°
73°
3
98°
74°
4
98°
74°
5
95°
76°
6
87°
67°
7
86°
61°
8
N/A
9
94°
73°
10
83°
68°
11
81°
65°
12
88°
68°
13
88°
69°
14
91°
70°
15
85°
64°
16
82°
62°
17
78°
60°
18
77°
56°
19
76°
55°
20
75°
54°
21
77°
57°
22
77°
62°
23
80°
61°
24
83°
63°
25
83°
63°
26
82°
62°
27
83°
62°
28
82°
61°
29
82°
62°
30
81°
61°
1
81°
58°
2
79°
50°
3
68°
48°
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 68° to 94°, with overnight lows between 48° and 73°. The average high for September is 81° 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 Prospect. See also: October | November | December.
