S
M
T
W
T
F
S
26
81°
61°
27
84°
62°
28
78°
61°
29
79°
61°
30
81°
62°
31
84°
62°
1
84°
61°
2
83°
60°
3
86°
62°
4
86°
61°
5
79°
57°
6
81°
58°
7
79°
55°
8
77°
56°
9
77°
54°
10
78°
54°
11
81°
60°
12
85°
61°
13
81°
57°
14
84°
53°
15
78°
54°
16
79°
60°
17
83°
58°
18
78°
53°
19
78°
53°
20
81°
54°
21
81°
57°
22
84°
59°
23
84°
59°
24
83°
58°
25
85°
58°
26
82°
59°
27
83°
55°
28
82°
59°
29
83°
59°
30
82°
52°
31
76°
49°
1
75°
49°
2
74°
50°
3
74°
50°
4
75°
51°
5
73°
50°
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 73° to 86°, with overnight lows between 49° and 62°. The average high for August is 81° with an average low of 57°. 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.
