S
M
T
W
T
F
S
31
78°
46°
1
80°
49°
2
83°
51°
3
84°
50°
4
86°
47°
5
79°
44°
6
76°
43°
7
74°
47°
8
77°
50°
9
82°
48°
10
76°
48°
11
81°
47°
12
84°
47°
13
76°
44°
14
82°
42°
15
77°
44°
16
80°
46°
17
80°
47°
18
83°
49°
19
89°
52°
20
89°
53°
21
92°
53°
22
92°
54°
23
91°
53°
24
91°
55°
25
93°
53°
26
93°
53°
27
91°
49°
28
84°
47°
29
81°
48°
30
81°
50°
1
83°
50°
2
80°
51°
3
88°
52°
4
89°
53°
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 93°, with overnight lows between 42° and 55°. The average high for June is 84° with an average low of 49°. 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.
