S
M
T
W
T
F
S
26
87°
69°
27
89°
64°
28
87°
64°
29
89°
66°
30
88°
65°
31
88°
68°
1
89°
71°
2
90°
67°
3
89°
66°
4
87°
65°
5
88°
66°
6
88°
65°
7
89°
65°
8
88°
66°
9
88°
68°
10
93°
69°
11
89°
69°
12
88°
68°
13
89°
69°
14
90°
68°
15
90°
68°
16
93°
66°
17
92°
64°
18
91°
67°
19
92°
63°
20
88°
62°
21
86°
62°
22
86°
63°
23
87°
66°
24
91°
63°
25
89°
64°
26
91°
66°
27
92°
66°
28
90°
65°
29
88°
65°
30
86°
64°
31
88°
64°
1
88°
65°
2
89°
65°
3
90°
64°
4
89°
64°
5
84°
60°
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 84° to 93°, with overnight lows between 60° and 71°. The average high for August is 89° with an average low of 66°. 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.
