Cornwall — Weather

Live· Clear within 100 kmJust updated
Overcast
20°C67°F· Overcast · 83% cloud cover
Feels like 21°C69°F · Low 20°C67°F · High 27°C80°F
Wind
4 km/h1 m/s2 mph from S
Humidity
75%
Pressure
1012 hPa29.90 inHgstable
UV Index
0.0Low

Unsettled — rain

Cornwall at a glance: 20°C68°F, overcast.

⛈️ Extended wet spell, moderate-intensity Sunday–Thursday, with rain and embedded thunderstorms. Total ~20.9 mm. Peak Tuesday (6.8 mm). Typical for the month (normal ~92 mm/month).

🔥 Today's high of 27°C81°F sits 6.1°C34°F markedly warmer than the July mean (21°C70°F).

🌧️ Rain expected from 18:00.

Hourly forecast

Detailed forecast for the next 60 hours

15°C59°F20°C68°F25°C77°F30°C86°F0mm0.00in0.5mm0.02in1mm0.04in1.5mm0.06in2mm0.08in07:0013:0019:0001:0007:0013:0019:0003:0009:0015:0018:00
TemperaturePrecipitationWind
Now
Overcast
20°C67°F
412
75
08:00
Partly cloudy
21°C70°F
412
75
09:00
Overcast
22°C72°F
623
71
10:00
Overcast
23°C73°F
624
69
11:00
Overcast
24°C75°F
825
65
12:00
Partly cloudy
25°C77°F
825
62
13:00
Overcast
26°C79°F
725
60
14:00
Drizzle
26°C80°F
724
57
15:00
Drizzle
27°C80°F
724
55
16:00
Drizzle
27°C80°F
825
53
17:00
Drizzle
27°C80°F
725
57
18:00
Thunderstorm
25°C77°F
0.90.04
1036
69
19:00
Light rain
23°C74°F
1.00.04
624
81
20:00
Overcast
22°C72°F
312
85
21:00
Clear
21°C70°F
212
89
22:00
Clear
20°C69°F
312
91
23:00
Drizzle
20°C68°F
312
94
00:00
Drizzle
19°C66°F
211
97
01:00
Fog
19°C65°F
211
100
02:00
Fog
18°C65°F
211
100
03:00
Fog
18°C64°F
312
100
04:00
Fog
18°C64°F
513
100
05:00
Fog
17°C63°F
413
100
06:00
Fog
17°C63°F
312
99
07:00
Overcast
18°C65°F
413
95
08:00
Overcast
20°C68°F
412
90
09:00
Overcast
22°C71°F
624
83
10:00
Light rain
23°C73°F
0.20.01
725
79
11:00
Light rain
23°C74°F
0.50.02
724
79
12:00
Light rain
24°C76°F
0.20.01
413
77
13:00
Light rain
25°C77°F
0.10.00
513
74
14:00
Light rain
25°C77°F
0.40.01
624
75
15:00
Thunderstorm
24°C76°F
1.40.05
624
80
16:00
Light rain
25°C76°F
0.60.02
413
77
17:00
Light rain
25°C77°F
0.10.00
513
72
18:00
Light rain
24°C75°F
0.30.01
724
76
19:00
Light rain
24°C74°F
0.20.01
513
80
20:00
Clear
23°C73°F
312
87
21:00
Clear
21°C70°F
312
92
22:00
Partly cloudy
21°C69°F
312
94
23:00
Clear
20°C68°F
312
95
00:00
Fog
19°C66°F
412
98
03:00
Fog
18°C64°F
312
100
06:00
Fog
17°C63°F
312
99
09:00
Overcast
23°C73°F
623
81
12:00
Drizzle
25°C77°F
513
72
15:00
Light rain
26°C78°F
624
68
18:00
Thunderstorm
23°C74°F
1.80.07
413
86
mminkm/hm/smphHumidity %

Daily Forecast

Thunderstorm
Today
·Thunderstorm
2.1 mm0.08 inSW 10 km/h3 m/s6 mph(gusts 27817)71%UV 24h
20°C67°F
27°C80°F
Today
Thunderstorm
Thunderstorm
71%
SW 10 km/h3 m/s6 mph (gusts 27817)
2.1 mm0.08 in
UV 2
4h
20°C67°F
27°C80°F
Thunderstorm
Tomorrow
·Thunderstorm
4.0 mm0.16 inSW 7 km/h2 m/s5 mph(gusts 21613)88%UV 12h
17°C63°F
25°C77°F
Tomorrow
Thunderstorm
Thunderstorm
88%
SW 7 km/h2 m/s5 mph (gusts 21613)
4.0 mm0.16 in
UV 1
2h
17°C63°F
25°C77°F
Thunderstorm
Tuesday
·Thunderstorm
6.8 mm0.27 in· heavyE 6 km/h2 m/s4 mph(gusts 21613)87%UV 11h
17°C63°F
26°C78°F
Tuesday
Thunderstorm
Thunderstorm
87%
E 6 km/h2 m/s4 mph (gusts 21613)
6.8 mm0.27 in
UV 1
1h
17°C63°F
26°C78°F
Drizzle
Wednesday
·Drizzle
4.6 mm0.18 inNE 14 km/h4 m/s9 mph(gusts 34921)94%UV 16h
18°C64°F
22°C72°F
Wednesday
Drizzle
Drizzle
94%
NE 14 km/h4 m/s9 mph (gusts 34921)
4.6 mm0.18 in
UV 1
6h
18°C64°F
22°C72°F
Partly cloudy
Thursday
·Partly cloudy
3.5 mm0.14 inNE 15 km/h4 m/s9 mph(gusts 371023)80%UV 110h
15°C59°F
27°C81°F
Thursday
Partly cloudy
Partly cloudy
80%
NE 15 km/h4 m/s9 mph (gusts 371023)
3.5 mm0.14 in
UV 1
10h
15°C59°F
27°C81°F
Fog
Friday
·Fog
SW 7 km/h2 m/s4 mph(gusts 17511)71%UV 112h
17°C62°F
31°C87°F
Friday
Fog
Fog
71%
SW 7 km/h2 m/s4 mph (gusts 17511)
UV 1
12h
17°C62°F
31°C87°F
Overcast
Saturday
·Overcast
SW 12 km/h3 m/s7 mph(gusts 28818)66%UV 26h
19°C67°F
32°C89°F
Saturday
Overcast
Overcast
66%
SW 12 km/h3 m/s7 mph (gusts 28818)
UV 2
6h
19°C67°F
32°C89°F
Light rain
Sunday
·Light rain
12.6 mm0.50 in· heavyS 8 km/h2 m/s5 mph(gusts 32920)91%UV 12h
19°C66°F
22°C72°F
Sunday
Light rain
Light rain
91%
S 8 km/h2 m/s5 mph (gusts 32920)
12.6 mm0.50 in
UV 1
2h
19°C66°F
22°C72°F
Heavy rain
Monday
·Heavy rain
19.5 mm0.77 in· heavyE 10 km/h3 m/s6 mph(gusts 24715)90%14h
19°C66°F
28°C83°F
Monday
Heavy rain
Heavy rain
90%
E 10 km/h3 m/s6 mph (gusts 24715)
19.5 mm0.77 in
14h
19°C66°F
28°C83°F
Drizzle
Tuesday
·Drizzle
6.4 mm0.25 in· heavyS 7 km/h2 m/s4 mph(gusts 1237)93%11h
20°C68°F
26°C78°F
Tuesday
Drizzle
Drizzle
93%
S 7 km/h2 m/s4 mph (gusts 1237)
6.4 mm0.25 in
11h
20°C68°F
26°C78°F
Light rain
Wednesday
·Light rain
6.5 mm0.26 in· heavySW 16 km/h4 m/s10 mph(gusts 29818)91%12h
14°C58°F
27°C80°F
Wednesday
Light rain
Light rain
91%
SW 16 km/h4 m/s10 mph (gusts 29818)
6.5 mm0.26 in
12h
14°C58°F
27°C80°F
Drizzle
Thursday
·Drizzle
NW 8 km/h2 m/s5 mph(gusts 19512)77%15h
12°C53°F
21°C69°F
Thursday
Drizzle
Drizzle
77%
NW 8 km/h2 m/s5 mph (gusts 19512)
15h
12°C53°F
21°C69°F
Clear
Friday
·Clear
W 16 km/h4 m/s10 mph(gusts 24715)60%14h
14°C57°F
21°C69°F
Friday
Clear
Clear
60%
W 16 km/h4 m/s10 mph (gusts 24715)
14h
14°C57°F
21°C69°F
Clear
Saturday
·Clear
SW 10 km/h3 m/s6 mph66%14h
10°C49°F
24°C76°F
Saturday
Clear
Clear
66%
SW 10 km/h3 m/s6 mph
14h
10°C49°F
24°C76°F
Clear
Sunday
·Clear
S 24 km/h7 m/s15 mph(gusts 521432)56%14h
18°C64°F
31°C88°F
Sunday
Clear
Clear
56%
S 24 km/h7 m/s15 mph (gusts 521432)
14h
18°C64°F
31°C88°F
Light rain
Monday
·Light rain
5.5 mm0.22 in· heavySW 24 km/h7 m/s15 mph(gusts 571636)91%13h
21°C69°F
25°C77°F
Monday
Light rain
Light rain
91%
SW 24 km/h7 m/s15 mph (gusts 571636)
5.5 mm0.22 in
13h
21°C69°F
25°C77°F
Sunrise
05:37
Civil Dawn 05:07
Sunset
20:33
Civil Dusk 21:03
Today vs. seasonal normal
+0.2°C+0.4°F
High 26.6°C80°F · Low 15.0°C59°F · Normal for this month
AQI
27 · Fair
Pollen
0 · None
Fire Risk
0 · Very low
Very low

Cornwall is located in Ontario, Canada. Elevation: 57m. Annual average temperature: 6.2°C. Annual precipitation: 986mm.

CloudsLast updated 02:00
Clouds weather map
0%100%
PrecipitationLast updated 02:00
Precipitation weather map
010+ mm/h
TemperatureLast updated 02:00
Temperature weather map
−20°40°

Frequently Asked Questions

What is the weather like in Cornwall today?

Today in Cornwall, Canada, the temperature is 20°C with Overcast. The high is 27°C and the low is 20°C.

What is the 16-day forecast for Cornwall?

The 16-day forecast for Cornwall shows the warmest day is Saturday at 32°C, while the coolest night is Saturday at 10°C. 11 day(s) have precipitation expected.

What time is sunrise and sunset in Cornwall?

In Cornwall, sunrise is at 05:37 and sunset is at 20:33. Day length is approximately 14h 55m.

How accurate is the weather forecast for Cornwall?

Our forecasts for Cornwall use the DWD ICON model, one of the world's most advanced weather prediction systems. Accuracy is typically 85-90% for 1-3 day forecasts. Cornwall has an annual average temperature of 6.2°C and receives 986mm of precipitation per year.

Last updated: 07/26/2026, 07:00 AM

July climate in Cornwall

Normals for July: average 21°C (15–27°C), around 92 mm of rain across the month. About 15°C warmer than the annual average of 6.2°C.

Nearby places right now

Cornwall Island20°
Overcast2.2 km
Rooseveltown20°
Overcast5.1 km
Glendale19°
Overcast-1°7.0 km
Tyotown19°
Overcast-1°6.7 km
Hogansburg18°
Overcast-2°7.1 km
Saint Regis18°
Overcast-2°6.4 km
Glen Walter18°
Overcast-2°7.2 km
Raquette River19°
Overcast-1°9.1 km
L'Île-Saint-Régis18°
Overcast-2°7.6 km
Helena19°
Overcast-1°11 km
Saint Andrews West19°
Overcast-1°10 km
Massena Center19°
Partly cloudy-1°10 km
Weather in Canada

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