S
M
T
W
T
F
S
30
78°
57°
31
79°
56°
1
80°
57°
2
78°
56°
3
77°
54°
4
78°
55°
5
78°
60°
6
77°
59°
7
77°
57°
8
80°
55°
9
77°
55°
10
79°
62°
11
82°
61°
12
82°
61°
13
83°
53°
14
78°
60°
15
77°
56°
16
77°
57°
17
74°
60°
18
81°
57°
19
78°
56°
20
77°
50°
21
80°
49°
22
72°
47°
23
75°
55°
24
80°
49°
25
74°
48°
26
Hist. Avg.
72°
50°
27
Hist. Avg.
71°
50°
28
Hist. Avg.
71°
50°
29
Hist. Avg.
70°
49°
30
Hist. Avg.
70°
49°
1
Hist. Avg.
70°
49°
2
Hist. Avg.
69°
48°
3
Hist. Avg.
69°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Valparaiso
Valparaiso's September 2026 forecast shows daily high temperatures ranging from 72° to 83°, with overnight lows between 47° and 62°. The average high for September is 78° with an average low of 56°. 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.
