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Bolton, Ontario

40°F
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Bolton

Ontario

40°
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Bolton, Ontario Weather
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Monthly

Air Quality Health & Activities
Yellow Warning - Rainfall

May

January February March April May June July August September October November December

2026

2025 2026 2027

10-Day

S
M
T
W
T
F
S
26
Considerable cloudiness
51°
34°
27
Mostly sunny
52°
33°
28
Mostly cloudy
57°
37°
29
Times of clouds and sun
54°
34°
30
Cloudy with a little rain
53°
37°
1
Sunshine and a few clouds
54°
35°
2
Sunshine
54°
32°
3
Clouds breaking for some sun
58°
37°
4
Plenty of sun
65°
44°
5
Mainly cloudy
66°
41°
6
Considerable cloudiness
59°
38°
7
Mostly sunny
62°
44°
8
Times of clouds and sun
69°
46°
9
A couple of afternoon showers
69°
44°
10
Increasing cloudiness
68°
40°
11
Cloudy and cooler
57°
40°
12
Cloudy
58°
39°
13
A little afternoon rain
59°
43°
14
Abundant sunshine
59°
43°
15
Brilliant sunshine
63°
46°
16
A little afternoon rain
68°
47°
17
A couple of morning showers
63°
48°
18
Mostly cloudy
67°
38°
19
Mostly sunny
67°
37°
20
Mostly cloudy
61°
37°
21
Clouds and sun, a few showers
62°
36°
22
A couple of showers
61°
37°
23
Some sun
62°
38°
24
Sunshine and a few clouds
63°
41°
25
Partly sunny
65°
41°
26
Clouds and sun
67°
45°
27
Cloudy with afternoon rain
70°
38°
28
Clouds yielding to sun
64°
44°
29
Times of clouds and sun
65°
48°
30
Morning rain, then a shower
71°
41°
31
A touch of morning rain
67°
43°
1
Showers around in the p.m.
65°
45°
2
A shower and thunderstorm
69°
44°
3
Clouds and sun
67°
53°
4
Mostly sunny
73°
49°
5
A couple of thunderstorms
75°
45°
6
Clouds, showers and t-storms
68°
45°

Temperature Graph

°F
80° 70° 60° 50° 40° May
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo

May Weather in Bolton

Bolton's May 2026 forecast shows daily high temperatures ranging from 51° to 75°, with overnight lows between 32° and 53°. The average high for May is 63° with an average low of 41°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Bolton. See also: June | July | August.

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Weather Near Bolton:

  • Brampton, Ontario
  • Mississauga Valley, Ontario
  • Toronto, Ontario
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