S
M
T
W
T
F
S
26
54°
40°
27
66°
40°
28
64°
41°
29
62°
45°
30
58°
46°
1
64°
42°
2
59°
40°
3
60°
46°
4
68°
54°
5
76°
59°
6
69°
55°
7
61°
43°
8
61°
44°
9
60°
45°
10
62°
49°
11
64°
48°
12
65°
49°
13
62°
48°
14
64°
49°
15
67°
51°
16
73°
55°
17
72°
54°
18
74°
54°
19
74°
54°
20
73°
55°
21
72°
53°
22
72°
48°
23
67°
47°
24
65°
48°
25
66°
48°
26
67°
51°
27
67°
49°
28
68°
49°
29
68°
50°
30
67°
49°
31
69°
58°
1
74°
56°
2
70°
52°
3
70°
56°
4
75°
59°
5
72°
56°
6
72°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Greenwich
Greenwich's May 2026 forecast shows daily high temperatures ranging from 59° to 76°, with overnight lows between 40° and 59°. The average high for May is 68° with an average low of 51°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Greenwich. See also: June | July | August.
