S
M
T
W
T
F
S
26
84°
61°
27
81°
64°
28
67°
60°
29
82°
63°
30
72°
60°
1
66°
53°
2
69°
46°
3
71°
47°
4
78°
51°
5
81°
57°
6
79°
61°
7
73°
46°
8
71°
46°
9
76°
51°
10
79°
58°
11
79°
56°
12
81°
56°
13
82°
57°
14
83°
55°
15
83°
60°
16
84°
59°
17
84°
60°
18
83°
60°
19
84°
59°
20
85°
61°
21
85°
61°
22
84°
60°
23
84°
61°
24
80°
61°
25
84°
60°
26
85°
62°
27
80°
62°
28
81°
61°
29
84°
61°
30
86°
62°
31
85°
61°
1
87°
63°
2
87°
63°
3
86°
64°
4
88°
64°
5
83°
63°
6
82°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Thornton
Thornton's May 2026 forecast shows daily high temperatures ranging from 66° to 88°, with overnight lows between 46° and 64°. The average high for May is 81° with an average low of 58°. 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 Thornton. See also: June | July | August.
