S
M
T
W
T
F
S
30
78°
60°
31
78°
66°
1
78°
63°
2
69°
61°
3
83°
67°
4
82°
68°
5
78°
62°
6
73°
59°
7
77°
53°
8
78°
58°
9
81°
61°
10
84°
69°
11
78°
55°
12
76°
66°
13
79°
63°
14
74°
52°
15
71°
60°
16
78°
65°
17
80°
61°
18
77°
61°
19
73°
56°
20
70°
54°
21
68°
53°
22
69°
54°
23
70°
57°
24
73°
44°
25
65°
49°
26
66°
49°
27
70°
57°
28
74°
54°
29
67°
49°
30
68°
56°
1
69°
53°
2
65°
50°
3
68°
55°
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 65° to 80°, with overnight lows between 44° and 66°. The average high for September is 72° with an average low of 55°. 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.
