S
M
T
W
T
F
S
26
73°
54°
27
76°
51°
28
79°
55°
29
80°
57°
30
81°
57°
31
84°
61°
1
84°
62°
2
82°
58°
3
75°
58°
4
81°
62°
5
82°
61°
6
83°
59°
7
77°
54°
8
74°
52°
9
74°
54°
10
78°
58°
11
80°
58°
12
78°
54°
13
74°
53°
14
73°
52°
15
74°
55°
16
73°
53°
17
73°
52°
18
74°
49°
19
73°
50°
20
74°
51°
21
75°
51°
22
75°
52°
23
74°
51°
24
73°
53°
25
75°
53°
26
77°
54°
27
77°
56°
28
76°
54°
29
70°
52°
30
71°
53°
31
69°
49°
1
69°
49°
2
70°
48°
3
68°
47°
4
68°
50°
5
69°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Rheinfelden
Rheinfelden's August 2026 forecast shows daily high temperatures ranging from 68° to 84°, with overnight lows between 47° and 62°. The average high for August is 75° 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 Rheinfelden. See also: September | October | November.
