S
M
T
W
T
F
S
30
85°
63°
31
85°
58°
1
84°
56°
2
79°
61°
3
80°
54°
4
75°
53°
5
77°
53°
6
78°
60°
7
80°
52°
8
75°
54°
9
77°
60°
10
74°
59°
11
81°
59°
12
82°
58°
13
83°
57°
14
84°
58°
15
83°
59°
16
71°
53°
17
72°
56°
18
Hist. Avg.
80°
53°
19
Hist. Avg.
79°
53°
20
Hist. Avg.
79°
52°
21
Hist. Avg.
78°
52°
22
Hist. Avg.
78°
52°
23
Hist. Avg.
78°
51°
24
Hist. Avg.
77°
51°
25
Hist. Avg.
77°
50°
26
Hist. Avg.
76°
50°
27
Hist. Avg.
76°
49°
28
Hist. Avg.
75°
49°
29
Hist. Avg.
75°
48°
30
Hist. Avg.
74°
48°
1
Hist. Avg.
74°
48°
2
Hist. Avg.
74°
47°
3
Hist. Avg.
73°
47°
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 71° to 85°, with overnight lows between 52° and 63°. The average high for September is 79° 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 Valparaiso. See also: October | November | December.
