S
M
T
W
T
F
S
26
93°
78°
27
97°
80°
28
99°
80°
29
98°
80°
30
98°
80°
1
99°
80°
2
94°
82°
3
95°
77°
4
95°
77°
5
96°
79°
6
95°
79°
7
96°
79°
8
97°
79°
9
95°
75°
10
98°
81°
11
97°
79°
12
98°
80°
13
97°
80°
14
98°
80°
15
99°
81°
16
98°
80°
17
97°
81°
18
95°
80°
19
94°
80°
20
95°
79°
21
93°
79°
22
95°
79°
23
97°
81°
24
98°
82°
25
98°
81°
26
96°
81°
27
97°
80°
28
95°
80°
29
96°
78°
30
92°
76°
31
93°
75°
1
92°
78°
2
92°
77°
3
92°
77°
4
91°
78°
5
88°
76°
6
88°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Phnom Penh
Phnom Penh's May 2026 forecast shows daily high temperatures ranging from 88° to 98°, with overnight lows between 75° and 82°. The average high for May is 94° with an average low of 78°. 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 Phnom Penh. See also: June | July | August.
