S
M
T
W
T
F
S
26
83°
69°
27
84°
70°
28
85°
69°
29
83°
70°
30
85°
71°
31
86°
71°
1
87°
70°
2
85°
69°
3
81°
65°
4
81°
67°
5
80°
67°
6
80°
65°
7
82°
69°
8
84°
69°
9
85°
70°
10
86°
70°
11
85°
69°
12
84°
69°
13
85°
70°
14
85°
68°
15
85°
69°
16
82°
68°
17
81°
70°
18
85°
70°
19
84°
69°
20
83°
63°
21
85°
61°
22
79°
62°
23
79°
63°
24
80°
64°
25
78°
61°
26
79°
67°
27
79°
62°
28
80°
61°
29
77°
61°
30
77°
59°
31
78°
59°
1
76°
60°
2
76°
61°
3
77°
62°
4
75°
61°
5
77°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Riverhead
Riverhead's August 2026 forecast shows daily high temperatures ranging from 75° to 87°, with overnight lows between 59° and 71°. The average high for August is 82° with an average low of 66°. 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 Riverhead. See also: September | October | November.
