S
M
T
W
T
F
S
26
85°
70°
27
87°
71°
28
86°
71°
29
87°
71°
30
86°
70°
1
88°
76°
2
87°
75°
3
88°
76°
4
87°
75°
5
87°
75°
6
88°
76°
7
81°
74°
8
80°
75°
9
80°
75°
10
81°
74°
11
81°
75°
12
80°
75°
13
80°
74°
14
81°
76°
15
81°
76°
16
82°
75°
17
82°
76°
18
81°
76°
19
81°
75°
20
82°
75°
21
81°
76°
22
81°
76°
23
80°
75°
24
80°
76°
25
81°
76°
26
81°
77°
27
82°
77°
28
81°
76°
29
80°
77°
30
80°
77°
31
82°
76°
1
80°
77°
2
81°
77°
3
82°
76°
4
81°
76°
5
85°
75°
6
84°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
Sinus-May Weather in Falmouth
Falmouth's Sinus-May 2026 forecast shows daily high temperatures ranging from 80° to 88°, with overnight lows between 70° and 77°. The average high for Sinus-May is 83° with an average low of 75°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how Sinus-May weather will actually feel in Falmouth. See also: June | July | August.