S
M
T
W
T
F
S
30
76°
54°
31
75°
53°
1
75°
52°
2
76°
50°
3
75°
53°
4
77°
57°
5
76°
59°
6
75°
54°
7
77°
56°
8
76°
58°
9
75°
51°
10
79°
50°
11
74°
51°
12
78°
54°
13
76°
49°
14
73°
56°
15
79°
58°
16
81°
58°
17
79°
56°
18
79°
46°
19
72°
46°
20
69°
47°
21
70°
48°
22
74°
55°
23
77°
55°
24
76°
52°
25
77°
44°
26
75°
43°
27
66°
43°
28
65°
44°
29
66°
44°
30
66°
42°
1
Hist. Avg.
69°
46°
2
Hist. Avg.
68°
45°
3
Hist. Avg.
68°
45°
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 65° to 81°, with overnight lows between 42° and 59°. The average high for September is 75° with an average low of 51°. 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.
