S
M
T
W
T
F
S
28
80°
66°
29
87°
63°
30
85°
65°
1
84°
69°
2
96°
73°
3
98°
75°
4
96°
72°
5
81°
68°
6
69°
64°
7
70°
63°
8
81°
68°
9
84°
72°
10
89°
72°
11
84°
66°
12
82°
66°
13
83°
68°
14
88°
70°
15
89°
70°
16
86°
69°
17
83°
68°
18
85°
67°
19
83°
69°
20
84°
68°
21
80°
67°
22
79°
65°
23
81°
65°
24
85°
67°
25
80°
66°
26
79°
68°
27
85°
71°
28
81°
71°
29
83°
70°
30
84°
71°
31
80°
70°
1
81°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Central Islip
Central Islip's July 2026 forecast shows daily high temperatures ranging from 79° to 89°, with overnight lows between 65° and 72°. The average high for July is 83° with an average low of 69°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Central Islip. See also: August | September | October.
