S
M
T
W
T
F
S
1
37°
29°
2
43°
34°
3
45°
40°
4
48°
43°
5
59°
41°
6
70°
48°
7
53°
30°
8
69°
28°
9
80°
46°
10
86°
49°
11
54°
25°
12
61°
20°
13
60°
37°
14
72°
38°
15
66°
20°
16
32°
11°
17
38°
11°
18
76°
26°
19
85°
38°
20
93°
40°
21
94°
40°
22
78°
39°
23
52°
29°
24
68°
29°
25
91°
46°
26
96°
54°
27
59°
24°
28
62°
19°
29
77°
42°
30
89°
61°
31
82°
58°
1
67°
59°
2
74°
57°
3
75°
41°
4
60°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
March Weather in Ottawa
Ottawa's March 2026 forecast shows daily high temperatures ranging from 60° to 75°, with overnight lows between 36° and 59°. The average high for March is 69° with an average low of 48°. 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 Ottawa. See also: April | May | June.
