S
M
T
W
T
F
S
30
82°
66°
31
90°
71°
1
92°
72°
2
94°
72°
3
88°
71°
4
88°
70°
5
85°
66°
6
80°
62°
7
78°
58°
8
80°
59°
9
81°
59°
10
76°
57°
11
79°
47°
12
83°
61°
13
83°
61°
14
80°
61°
15
81°
60°
16
81°
61°
17
80°
60°
18
81°
60°
19
81°
61°
20
82°
61°
21
81°
60°
22
81°
60°
23
80°
59°
24
81°
60°
25
80°
59°
26
81°
59°
27
80°
58°
28
80°
58°
29
79°
57°
30
78°
56°
1
78°
56°
2
77°
55°
3
78°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Valparaiso
Valparaiso's September 2026 forecast shows daily high temperatures ranging from 76° to 94°, with overnight lows between 47° and 72°. 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 Valparaiso. See also: October | November | December.
