S
M
T
W
T
F
S
26
81°
70°
27
81°
71°
28
82°
72°
29
81°
72°
30
81°
71°
1
82°
72°
2
81°
72°
3
82°
71°
4
83°
71°
5
83°
70°
6
81°
70°
7
80°
69°
8
80°
71°
9
81°
70°
10
80°
70°
11
82°
71°
12
82°
71°
13
83°
70°
14
80°
70°
15
79°
70°
16
80°
70°
17
80°
71°
18
81°
71°
19
80°
70°
20
80°
71°
21
82°
69°
22
81°
68°
23
80°
68°
24
80°
67°
25
81°
68°
26
79°
67°
27
79°
67°
28
80°
66°
29
79°
66°
30
80°
64°
31
80°
66°
1
79°
66°
2
79°
65°
3
80°
66°
4
81°
65°
5
82°
67°
6
81°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Cairns
Cairns's May 2026 forecast shows daily high temperatures ranging from 79° to 83°, with overnight lows between 64° and 72°. The average high for May is 81° with an average low of 69°. 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 Cairns. See also: June | July | August.
