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