S
M
T
W
T
F
S
26
86°
66°
27
86°
68°
28
87°
68°
29
87°
66°
30
85°
67°
31
83°
66°
1
80°
62°
2
79°
61°
3
81°
65°
4
82°
65°
5
84°
66°
6
86°
66°
7
86°
67°
8
85°
67°
9
86°
66°
10
86°
66°
11
85°
65°
12
86°
66°
13
85°
66°
14
88°
59°
15
85°
61°
16
84°
61°
17
79°
60°
18
83°
58°
19
85°
55°
20
78°
53°
21
77°
54°
22
77°
55°
23
78°
54°
24
78°
58°
25
81°
55°
26
82°
59°
27
85°
61°
28
85°
55°
29
79°
53°
30
76°
54°
31
75°
53°
1
75°
52°
2
76°
50°
3
75°
53°
4
77°
57°
5
76°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Lisbon
Lisbon's August 2026 forecast shows daily high temperatures ranging from 75° to 88°, with overnight lows between 50° and 68°. The average high for August is 82° with an average low of 60°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Lisbon. See also: September | October | November.
