S
M
T
W
T
F
S
26
89°
77°
27
89°
77°
28
90°
76°
29
91°
77°
30
92°
77°
31
91°
76°
1
91°
77°
2
92°
76°
3
92°
75°
4
90°
75°
5
90°
74°
6
91°
75°
7
90°
76°
8
92°
75°
9
93°
74°
10
92°
75°
11
92°
76°
12
91°
74°
13
90°
74°
14
90°
75°
15
91°
75°
16
90°
74°
17
90°
75°
18
91°
75°
19
93°
74°
20
93°
74°
21
92°
75°
22
92°
74°
23
90°
74°
24
90°
73°
25
92°
73°
26
91°
74°
27
90°
73°
28
91°
74°
29
93°
75°
30
92°
75°
31
91°
74°
1
91°
75°
2
90°
74°
3
90°
74°
4
89°
74°
5
89°
74°
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 89° to 93°, with overnight lows between 73° and 77°. The average high for August is 91° with an average low of 75°. 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.
