S
M
T
W
T
F
S
26
94°
78°
27
90°
77°
28
91°
78°
29
91°
78°
30
92°
79°
1
91°
79°
2
90°
79°
3
91°
79°
4
91°
78°
5
91°
79°
6
92°
77°
7
91°
77°
8
90°
77°
9
86°
76°
10
87°
77°
11
87°
77°
12
89°
79°
13
90°
79°
14
89°
80°
15
89°
80°
16
89°
81°
17
90°
80°
18
90°
81°
19
89°
80°
20
90°
81°
21
90°
81°
22
89°
80°
23
89°
81°
24
90°
81°
25
88°
80°
26
88°
80°
27
88°
81°
28
89°
81°
29
90°
80°
30
89°
80°
31
87°
81°
1
89°
81°
2
88°
80°
3
86°
81°
4
87°
81°
5
86°
80°
6
86°
81°
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 92°, with overnight lows between 76° and 81°. The average high for May is 89° with an average low of 80°. 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.
