S
M
T
W
T
F
S
31
N/A
1
81°
60°
2
82°
64°
3
83°
65°
4
77°
65°
5
81°
66°
6
84°
69°
7
78°
71°
8
77°
72°
9
79°
70°
10
79°
70°
11
78°
70°
12
79°
71°
13
75°
70°
14
76°
71°
15
77°
71°
16
77°
70°
17
73°
69°
18
73°
68°
19
74°
72°
20
79°
73°
21
80°
73°
22
80°
72°
23
79°
72°
24
78°
73°
25
78°
73°
26
78°
72°
27
79°
73°
28
80°
74°
29
81°
74°
30
80°
73°
1
80°
73°
2
79°
72°
3
80°
74°
4
81°
75°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Siena
Siena's June 2026 forecast shows daily high temperatures ranging from 73° to 84°, with overnight lows between 60° and 75°. The average high for June is 79° with an average low of 71°. 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 Siena. See also: July | August | September.
