S
M
T
W
T
F
S
1
82°
60°
2
71°
53°
3
73°
49°
4
68°
50°
5
71°
53°
6
71°
46°
7
71°
60°
8
82°
61°
9
72°
51°
10
67°
53°
11
79°
49°
12
89°
56°
13
90°
58°
14
82°
57°
15
82°
54°
16
91°
56°
17
96°
65°
18
93°
66°
19
98°
65°
20
97°
65°
21
89°
63°
22
82°
60°
23
82°
58°
24
82°
56°
25
84°
55°
26
86°
55°
27
84°
59°
28
86°
56°
29
88°
59°
30
79°
57°
31
68°
58°
1
70°
55°
2
67°
54°
3
80°
50°
4
85°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
March Weather in Ontario
Ontario's March 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for March is ° with an average low of °. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how March weather will actually feel in Ontario. See also: April | May | June.
