S
M
T
W
T
F
S
30
90°
69°
31
89°
65°
1
86°
65°
2
83°
66°
3
86°
68°
4
88°
68°
5
87°
67°
6
88°
69°
7
89°
68°
8
88°
65°
9
88°
67°
10
82°
68°
11
87°
67°
12
87°
63°
13
81°
64°
14
81°
66°
15
83°
66°
16
86°
64°
17
85°
62°
18
83°
59°
19
80°
60°
20
81°
64°
21
79°
60°
22
81°
60°
23
84°
61°
24
84°
63°
25
84°
64°
26
83°
62°
27
84°
58°
28
79°
59°
29
82°
57°
30
82°
57°
1
81°
56°
2
Hist. Avg.
79°
56°
3
Hist. Avg.
79°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lisbon
Lisbon's September 2026 forecast shows daily high temperatures ranging from 79° to 90°, with overnight lows between 56° and 69°. The average high for September is 84° with an average low of 64°. 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 Lisbon. See also: October | November | December.
