S
M
T
W
T
F
S
26
81°
64°
27
83°
67°
28
84°
66°
29
85°
66°
30
85°
66°
31
84°
67°
1
85°
66°
2
83°
65°
3
82°
63°
4
81°
62°
5
81°
61°
6
82°
62°
7
81°
62°
8
81°
61°
9
82°
64°
10
81°
65°
11
81°
67°
12
82°
65°
13
81°
63°
14
81°
65°
15
82°
64°
16
84°
65°
17
82°
67°
18
85°
69°
19
86°
68°
20
87°
67°
21
86°
66°
22
85°
66°
23
83°
67°
24
85°
65°
25
85°
63°
26
82°
65°
27
80°
62°
28
83°
64°
29
80°
64°
30
80°
62°
31
81°
63°
1
80°
63°
2
81°
60°
3
80°
63°
4
80°
63°
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 80° to 87°, with overnight lows between 60° and 69°. The average high for August is 82° with an average low of 64°. 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.
