S
M
T
W
T
F
S
26
82°
65°
27
87°
68°
28
83°
70°
29
81°
64°
30
84°
60°
31
87°
62°
1
81°
68°
2
75°
72°
3
82°
65°
4
88°
59°
5
89°
71°
6
88°
71°
7
86°
72°
8
86°
69°
9
87°
70°
10
83°
68°
11
78°
65°
12
83°
66°
13
83°
67°
14
80°
58°
15
77°
67°
16
79°
64°
17
78°
61°
18
79°
60°
19
79°
60°
20
80°
61°
21
81°
61°
22
81°
60°
23
79°
59°
24
76°
55°
25
76°
56°
26
81°
61°
27
83°
63°
28
82°
61°
29
77°
57°
30
74°
54°
31
74°
56°
1
76°
61°
2
74°
61°
3
80°
62°
4
81°
61°
5
81°
62°
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 74° to 83°, with overnight lows between 54° and 68°. The average high for August is 79° with an average low of 61°. 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.
