S
M
T
W
T
F
S
30
66°
42°
31
Hist. Avg.
64°
40°
1
Hist. Avg.
64°
40°
2
Hist. Avg.
64°
40°
3
Hist. Avg.
64°
40°
4
Hist. Avg.
64°
40°
5
Hist. Avg.
64°
40°
6
Hist. Avg.
64°
41°
7
Hist. Avg.
64°
41°
8
Hist. Avg.
65°
41°
9
Hist. Avg.
65°
41°
10
Hist. Avg.
65°
41°
11
Hist. Avg.
65°
41°
12
Hist. Avg.
65°
41°
13
Hist. Avg.
65°
41°
14
Hist. Avg.
65°
41°
15
Hist. Avg.
66°
42°
16
Hist. Avg.
66°
42°
17
Hist. Avg.
66°
42°
18
Hist. Avg.
66°
42°
19
Hist. Avg.
66°
42°
20
Hist. Avg.
66°
42°
21
Hist. Avg.
67°
42°
22
Hist. Avg.
67°
42°
23
Hist. Avg.
67°
42°
24
Hist. Avg.
67°
42°
25
Hist. Avg.
67°
42°
26
Hist. Avg.
68°
43°
27
Hist. Avg.
68°
43°
28
Hist. Avg.
68°
43°
29
Hist. Avg.
68°
43°
30
Hist. Avg.
68°
43°
1
Hist. Avg.
69°
43°
2
Hist. Avg.
69°
43°
3
Hist. Avg.
69°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Santiago
Santiago's September 2026 forecast shows daily high temperatures ranging from 66° to 66°, with overnight lows between 42° and 42°. The average high for September is 66° with an average low of 42°. 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 Santiago. See also: October | November | December.
