S
M
T
W
T
F
S
26
67°
51°
27
63°
48°
28
64°
46°
29
67°
46°
30
63°
50°
1
53°
47°
2
56°
46°
3
56°
48°
4
59°
50°
5
65°
51°
6
65°
48°
7
71°
51°
8
72°
57°
9
73°
59°
10
71°
59°
11
76°
59°
12
76°
62°
13
74°
58°
14
63°
53°
15
67°
52°
16
78°
56°
17
72°
58°
18
66°
55°
19
77°
58°
20
69°
59°
21
72°
59°
22
70°
60°
23
69°
62°
24
73°
60°
25
78°
59°
26
79°
61°
27
82°
62°
28
81°
63°
29
69°
58°
30
72°
56°
31
77°
63°
1
79°
66°
2
86°
64°
3
87°
67°
4
90°
67°
5
86°
65°
6
85°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Istanbul
Istanbul's May 2026 forecast shows daily high temperatures ranging from 85° to 90°, with overnight lows between 64° and 67°. The average high for May is 87° with an average low of 65°. 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 Istanbul. See also: June | July | August.
