S
M
T
W
T
F
S
26
81°
60°
27
82°
59°
28
81°
62°
29
79°
61°
30
79°
60°
31
80°
62°
1
80°
62°
2
81°
61°
3
82°
63°
4
81°
62°
5
83°
61°
6
79°
59°
7
78°
58°
8
79°
59°
9
78°
60°
10
78°
60°
11
79°
55°
12
77°
58°
13
78°
62°
14
80°
61°
15
77°
59°
16
76°
57°
17
77°
58°
18
77°
61°
19
78°
61°
20
82°
62°
21
81°
61°
22
81°
60°
23
76°
59°
24
85°
59°
25
81°
58°
26
82°
58°
27
83°
52°
28
76°
51°
29
74°
52°
30
73°
50°
31
72°
49°
1
73°
52°
2
74°
56°
3
73°
59°
4
80°
59°
5
82°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Plum Island
Plum Island's August 2026 forecast shows daily high temperatures ranging from 72° to 85°, with overnight lows between 49° and 63°. The average high for August is 79° with an average low of 58°. 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 Plum Island. See also: September | October | November.
