S
M
T
W
T
F
S
30
85°
63°
31
83°
66°
1
82°
67°
2
84°
66°
3
86°
67°
4
85°
65°
5
85°
65°
6
84°
66°
7
84°
66°
8
83°
64°
9
82°
65°
10
78°
65°
11
79°
64°
12
82°
65°
13
81°
64°
14
78°
62°
15
78°
64°
16
79°
63°
17
81°
62°
18
78°
62°
19
77°
61°
20
76°
64°
21
76°
63°
22
77°
62°
23
77°
60°
24
76°
59°
25
75°
62°
26
78°
64°
27
80°
64°
28
79°
63°
29
78°
60°
30
74°
60°
1
Hist. Avg.
72°
59°
2
Hist. Avg.
72°
59°
3
Hist. Avg.
71°
59°
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 74° to 86°, with overnight lows between 59° and 67°. The average high for September is 80° 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.
