S
M
T
W
T
F
S
31
81°
47°
1
82°
54°
2
80°
53°
3
82°
52°
4
87°
55°
5
90°
56°
6
89°
57°
7
95°
58°
8
88°
57°
9
90°
56°
10
86°
56°
11
91°
59°
12
89°
58°
13
92°
58°
14
83°
50°
15
86°
54°
16
78°
48°
17
74°
49°
18
76°
47°
19
79°
51°
20
84°
54°
21
84°
53°
22
80°
52°
23
87°
54°
24
89°
56°
25
90°
57°
26
84°
56°
27
90°
57°
28
91°
58°
29
91°
58°
30
85°
55°
1
91°
58°
2
92°
58°
3
92°
59°
4
87°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Longmont
Longmont's June 2026 forecast shows daily high temperatures ranging from 74° to 95°, with overnight lows between 47° and 59°. The average high for June is 86° with an average low of 55°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how June weather will actually feel in Longmont. See also: July | August | September.
