S
M
T
W
T
F
S
26
72°
56°
27
73°
48°
28
69°
47°
29
62°
50°
30
64°
54°
31
65°
53°
1
66°
57°
2
65°
59°
3
73°
61°
4
73°
50°
5
75°
49°
6
74°
55°
7
65°
51°
8
67°
50°
9
65°
54°
10
67°
50°
11
71°
50°
12
65°
51°
13
67°
51°
14
69°
50°
15
66°
49°
16
64°
50°
17
64°
51°
18
66°
52°
19
67°
54°
20
68°
55°
21
68°
59°
22
71°
59°
23
69°
58°
24
72°
59°
25
75°
60°
26
75°
61°
27
76°
60°
28
78°
59°
29
75°
60°
30
68°
54°
31
72°
56°
1
67°
53°
2
71°
52°
3
Hist. Avg.
70°
54°
4
Hist. Avg.
70°
55°
5
Hist. Avg.
70°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Porto Alegre
Porto Alegre's August 2026 forecast shows daily high temperatures ranging from 62° to 78°, with overnight lows between 47° and 61°. The average high for August is 69° with an average low of 54°. 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 Porto Alegre. See also: September | October | November.
