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
80°
63°
9
82°
68°
10
85°
72°
11
82°
66°
12
83°
65°
13
81°
63°
14
85°
69°
15
92°
74°
16
86°
72°
17
84°
66°
18
79°
68°
19
80°
63°
20
78°
60°
21
78°
66°
22
84°
71°
23
79°
62°
24
81°
62°
25
81°
64°
26
79°
66°
27
82°
70°
28
80°
70°
29
81°
68°
30
81°
69°
31
82°
68°
1
80°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Islip
Islip's July 2026 forecast shows daily high temperatures ranging from 79° to 82°, with overnight lows between 62° and 70°. The average high for July 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 July weather will actually feel in Islip. See also: August | September | October.
