S
M
T
W
T
F
S
26
81°
64°
27
83°
63°
28
80°
61°
29
75°
63°
30
81°
64°
31
77°
62°
1
79°
63°
2
81°
58°
3
77°
55°
4
76°
56°
5
77°
58°
6
78°
57°
7
82°
59°
8
76°
55°
9
80°
57°
10
83°
63°
11
83°
57°
12
82°
60°
13
82°
65°
14
85°
64°
15
82°
57°
16
83°
54°
17
75°
53°
18
75°
55°
19
76°
55°
20
74°
56°
21
73°
57°
22
75°
61°
23
74°
63°
24
81°
61°
25
84°
53°
26
81°
51°
27
73°
51°
28
73°
50°
29
74°
55°
30
74°
60°
31
80°
61°
1
80°
60°
2
81°
56°
3
79°
52°
4
78°
57°
5
79°
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 85°, with overnight lows between 50° and 65°. The average high for August is 79° with an average low of 58°. 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.
