S
M
T
W
T
F
S
30
80°
66°
31
84°
55°
1
79°
53°
2
84°
59°
3
95°
63°
4
88°
57°
5
88°
68°
6
82°
64°
7
79°
67°
8
85°
57°
9
77°
50°
10
88°
59°
11
84°
51°
12
68°
47°
13
65°
47°
14
63°
46°
15
73°
50°
16
74°
51°
17
69°
48°
18
67°
45°
19
66°
47°
20
70°
44°
21
70°
51°
22
74°
52°
23
75°
51°
24
70°
49°
25
69°
49°
26
71°
50°
27
72°
50°
28
73°
49°
29
70°
47°
30
59°
46°
1
58°
44°
2
57°
39°
3
57°
43°
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 57° to 88°, with overnight lows between 39° and 67°. The average high for September is 70° with an average low of 49°. 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.
