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St. Thomas, Ontario

46°F
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St. Thomas

Ontario

46°
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St. Thomas, Ontario Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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Monthly

Air Quality Health & Activities
Yellow Advisory - Frost

June

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
31
Cloudy
66°
46°
1
Cloudy
61°
49°
2
Windy with rain
60°
49°
3
Times of sun and clouds
62°
50°
4
Turning cloudy
63°
48°
5
Mostly sunny
63°
51°
6
Cloudy most of the time
64°
52°
7
Mostly sunny
64°
50°
8
Mostly sunny
63°
49°
9
Mostly sunny
64°
51°
10
Mostly cloudy
66°
56°
11
Mostly cloudy
68°
58°
12
Showers around in the p.m.
65°
51°
13
Periods of rain
65°
51°
14
Intervals of clouds and sun
66°
55°
15
Mostly sunny
70°
58°
16
Mostly sunny
74°
58°
17
Sunny much of the time
76°
58°
18
Sunny
76°
60°
19
Partly sunny
77°
61°
20
A couple of thunderstorms
77°
62°
21
Clouds and sunshine
74°
62°
22
Thunderstorms in the morning
74°
63°
23
Mostly sunny and humid
78°
58°
24
A shower and thunderstorm
75°
54°
25
Partly sunny
74°
61°
26
Mostly sunny
78°
63°
27
A t-storm around in the a.m.
79°
63°
28
Couple of thunderstorms
80°
64°
29
A shower and t-storm; humid
79°
65°
30
Couple of thunderstorms
79°
57°
1
Partly sunny and less humid
78°
55°
2
Sunshine and a few clouds
73°
64°
3
Mostly sunny
79°
65°
4
Sunshine, warm and humid
80°
66°

Temperature Graph

°F
80° 72° 64° 56° 48° Jun
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
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo

June Weather in St. Thomas

St. Thomas's June 2026 forecast shows daily high temperatures ranging from 60° to 80°, with overnight lows between 46° and 66°. The average high for June is 71° with an average low of 57°. 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 St. Thomas. See also: July | August | September.

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Weather Near St. Thomas:

  • Cleveland, OH
  • Hamilton, Ontario
  • London, Ontario
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