S
M
T
W
T
F
S
30
91°
71°
31
88°
70°
1
87°
71°
2
90°
72°
3
87°
70°
4
89°
69°
5
88°
70°
6
89°
70°
7
90°
71°
8
90°
69°
9
89°
71°
10
90°
71°
11
90°
70°
12
89°
71°
13
89°
71°
14
88°
70°
15
88°
69°
16
87°
69°
17
87°
68°
18
88°
69°
19
88°
68°
20
87°
69°
21
88°
69°
22
86°
68°
23
88°
67°
24
87°
68°
25
88°
64°
26
85°
63°
27
Hist. Avg.
N/A
28
Hist. Avg.
N/A
29
Hist. Avg.
N/A
30
Hist. Avg.
N/A
1
Hist. Avg.
N/A
2
Hist. Avg.
N/A
3
Hist. Avg.
N/A
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 85° to 91°, with overnight lows between 63° and 72°. The average high for September is 88° with an average low of 69°. 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.
