S
M
T
W
T
F
S
26
81°
58°
27
83°
63°
28
80°
72°
29
79°
68°
30
77°
66°
31
83°
64°
1
83°
72°
2
82°
74°
3
79°
63°
4
84°
63°
5
80°
73°
6
84°
73°
7
88°
72°
8
84°
71°
9
87°
70°
10
86°
72°
11
88°
69°
12
83°
68°
13
85°
67°
14
82°
66°
15
82°
67°
16
80°
66°
17
81°
67°
18
80°
64°
19
78°
69°
20
79°
65°
21
78°
62°
22
77°
67°
23
83°
69°
24
84°
69°
25
83°
68°
26
80°
68°
27
77°
67°
28
77°
68°
29
80°
67°
30
82°
68°
31
81°
67°
1
80°
63°
2
74°
60°
3
73°
61°
4
74°
59°
5
74°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Holtsville
Holtsville's August 2026 forecast shows daily high temperatures ranging from 73° to 88°, with overnight lows between 59° and 73°. The average high for August is 81° with an average low of 67°. 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 Holtsville. See also: September | October | November.
