S
M
T
W
T
F
S
26
87°
76°
27
91°
79°
28
91°
79°
29
90°
80°
30
89°
78°
1
89°
79°
2
90°
79°
3
90°
80°
4
91°
78°
5
90°
80°
6
89°
80°
7
88°
79°
8
89°
80°
9
89°
80°
10
90°
79°
11
89°
80°
12
90°
79°
13
89°
79°
14
88°
80°
15
90°
81°
16
91°
80°
17
87°
81°
18
87°
80°
19
88°
79°
20
86°
80°
21
87°
80°
22
86°
81°
23
86°
79°
24
87°
80°
25
86°
81°
26
87°
80°
27
88°
81°
28
87°
79°
29
89°
78°
30
89°
78°
31
90°
79°
1
89°
79°
2
90°
78°
3
89°
79°
4
91°
78°
5
90°
78°
6
91°
79°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Gampaha
Gampaha's May 2026 forecast shows daily high temperatures ranging from 86° to 91°, with overnight lows between 76° and 81°. The average high for May is 89° with an average low of 79°. 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 Gampaha. See also: June | July | August.
