S
M
T
W
T
F
S
30
81°
62°
31
76°
58°
1
74°
58°
2
73°
57°
3
73°
57°
4
74°
58°
5
75°
64°
6
74°
63°
7
76°
64°
8
79°
63°
9
80°
63°
10
76°
64°
11
80°
63°
12
81°
62°
13
79°
63°
14
76°
60°
15
79°
52°
16
72°
52°
17
70°
51°
18
70°
52°
19
71°
56°
20
69°
59°
21
72°
58°
22
69°
58°
23
75°
59°
24
76°
58°
25
76°
58°
26
75°
59°
27
76°
55°
28
75°
47°
29
74°
47°
30
65°
51°
1
64°
49°
2
65°
53°
3
64°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Purchase
Purchase's September 2026 forecast shows daily high temperatures ranging from 64° to 81°, with overnight lows between 47° and 64°. The average high for September is 74° with an average low of 57°. 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 Purchase. See also: October | November | December.
