Cornwall — Weather
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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
TemperaturePrecipitationWind
CAPE (J/kg)Instability Threshold
mminkm/hm/smphHumidity %
Daily Forecast
Today2.1 mm0.08 inSW 10 km/h3 m/s6 mph(gusts 27817)71%UV 24hToday71%SW 10 km/h3 m/s6 mph (gusts 27817)2.1 mm0.08 inUV 24h
Today
2.1 mm0.08 inSW 10 km/h3 m/s6 mph(gusts 27817)71%UV 24h
Today
71%
SW 10 km/h3 m/s6 mph (gusts 27817)
2.1 mm0.08 in
UV 2
4h
Today — Hourly Forecast
05:3714.9h20:33
Tomorrow4.0 mm0.16 inSW 7 km/h2 m/s5 mph(gusts 21613)88%UV 12hTomorrow88%SW 7 km/h2 m/s5 mph (gusts 21613)4.0 mm0.16 inUV 12h
Tomorrow
4.0 mm0.16 inSW 7 km/h2 m/s5 mph(gusts 21613)88%UV 12h
Tomorrow
88%
SW 7 km/h2 m/s5 mph (gusts 21613)
4.0 mm0.16 in
UV 1
2h
Tomorrow — Hourly Forecast
05:3814.9h20:32
Tuesday6.8 mm0.27 in· heavyE 6 km/h2 m/s4 mph(gusts 21613)87%UV 11hTuesday87%E 6 km/h2 m/s4 mph (gusts 21613)6.8 mm0.27 inUV 11h
Tuesday
6.8 mm0.27 in· heavyE 6 km/h2 m/s4 mph(gusts 21613)87%UV 11h
Tuesday
87%
E 6 km/h2 m/s4 mph (gusts 21613)
6.8 mm0.27 in
UV 1
1h
Tuesday — Forecast Overview
05:3914.8h20:30
Wednesday4.6 mm0.18 inNE 14 km/h4 m/s9 mph(gusts 34921)94%UV 16hWednesday94%NE 14 km/h4 m/s9 mph (gusts 34921)4.6 mm0.18 inUV 16h
Wednesday
4.6 mm0.18 inNE 14 km/h4 m/s9 mph(gusts 34921)94%UV 16h
Wednesday
94%
NE 14 km/h4 m/s9 mph (gusts 34921)
4.6 mm0.18 in
UV 1
6h
Wednesday — Forecast Overview
05:4114.8h20:29
Thursday3.5 mm0.14 inNE 15 km/h4 m/s9 mph(gusts 371023)80%UV 110hThursday80%NE 15 km/h4 m/s9 mph (gusts 371023)3.5 mm0.14 inUV 110h
Thursday
3.5 mm0.14 inNE 15 km/h4 m/s9 mph(gusts 371023)80%UV 110h
Thursday
80%
NE 15 km/h4 m/s9 mph (gusts 371023)
3.5 mm0.14 in
UV 1
10h
Thursday — Forecast Overview
05:4214.8h20:28
FridaySW 7 km/h2 m/s4 mph(gusts 17511)71%UV 112hFriday71%SW 7 km/h2 m/s4 mph (gusts 17511)UV 112h
Friday
SW 7 km/h2 m/s4 mph(gusts 17511)71%UV 112h
Friday
71%
SW 7 km/h2 m/s4 mph (gusts 17511)
UV 1
12h
Night
17°C62°F
Morning
27°C81°F
Afternoon
27°C81°F
Evening
27°C80°F
05:4314.7h20:27
SaturdaySW 12 km/h3 m/s7 mph(gusts 28818)66%UV 26hSaturday66%SW 12 km/h3 m/s7 mph (gusts 28818)UV 26h
Saturday
SW 12 km/h3 m/s7 mph(gusts 28818)66%UV 26h
Saturday
66%
SW 12 km/h3 m/s7 mph (gusts 28818)
UV 2
6h
Night
20°C69°F
Morning
28°C82°F
Afternoon
28°C82°F
Evening
27°C81°F
05:4414.7h20:26
Sunday12.6 mm0.50 in· heavyS 8 km/h2 m/s5 mph(gusts 32920)91%UV 12hSunday91%S 8 km/h2 m/s5 mph (gusts 32920)12.6 mm0.50 inUV 12h
Sunday
12.6 mm0.50 in· heavyS 8 km/h2 m/s5 mph(gusts 32920)91%UV 12h
Sunday
91%
S 8 km/h2 m/s5 mph (gusts 32920)
12.6 mm0.50 in
UV 1
2h
Night
22°C72°F
Morning
22°C72°F
Afternoon
22°C72°F
Evening
19°C66°F
05:4514.7h20:24
Monday19.5 mm0.77 in· heavyE 10 km/h3 m/s6 mph(gusts 24715)90%14hMonday90%E 10 km/h3 m/s6 mph (gusts 24715)19.5 mm0.77 in14h
Monday
19.5 mm0.77 in· heavyE 10 km/h3 m/s6 mph(gusts 24715)90%14h
Monday
90%
E 10 km/h3 m/s6 mph (gusts 24715)
19.5 mm0.77 in
14h
Night
19°C66°F
Morning
23°C73°F
Afternoon
23°C73°F
Evening
24°C74°F
05:4614.6h20:23
Tuesday6.4 mm0.25 in· heavyS 7 km/h2 m/s4 mph(gusts 1237)93%11hTuesday93%S 7 km/h2 m/s4 mph (gusts 1237)6.4 mm0.25 in11h
Tuesday
6.4 mm0.25 in· heavyS 7 km/h2 m/s4 mph(gusts 1237)93%11h
Tuesday
93%
S 7 km/h2 m/s4 mph (gusts 1237)
6.4 mm0.25 in
11h
Night
20°C69°F
Morning
26°C78°F
Afternoon
26°C78°F
Evening
24°C75°F
05:4714.6h20:22
Wednesday6.5 mm0.26 in· heavySW 16 km/h4 m/s10 mph(gusts 29818)91%12hWednesday91%SW 16 km/h4 m/s10 mph (gusts 29818)6.5 mm0.26 in12h
Wednesday
6.5 mm0.26 in· heavySW 16 km/h4 m/s10 mph(gusts 29818)91%12h
Wednesday
91%
SW 16 km/h4 m/s10 mph (gusts 29818)
6.5 mm0.26 in
12h
Night
21°C69°F
Morning
27°C80°F
Afternoon
27°C80°F
Evening
17°C63°F
05:4914.5h20:20
ThursdayNW 8 km/h2 m/s5 mph(gusts 19512)77%15hThursday77%NW 8 km/h2 m/s5 mph (gusts 19512)15h
Thursday
NW 8 km/h2 m/s5 mph(gusts 19512)77%15h
Thursday
77%
NW 8 km/h2 m/s5 mph (gusts 19512)
15h
Night
12°C53°F
Morning
16°C60°F
Afternoon
16°C60°F
Evening
17°C63°F
05:5014.5h20:19
FridayW 16 km/h4 m/s10 mph(gusts 24715)60%14hFriday60%W 16 km/h4 m/s10 mph (gusts 24715)14h
Friday
W 16 km/h4 m/s10 mph(gusts 24715)60%14h
Friday
60%
W 16 km/h4 m/s10 mph (gusts 24715)
14h
Night
15°C60°F
Morning
19°C66°F
Afternoon
19°C66°F
Evening
16°C60°F
05:5114.4h20:18
SaturdaySW 10 km/h3 m/s6 mph66%14hSaturday66%SW 10 km/h3 m/s6 mph14h
Saturday
SW 10 km/h3 m/s6 mph66%14h
Saturday
66%
SW 10 km/h3 m/s6 mph
14h
Night
11°C52°F
Morning
21°C70°F
Afternoon
21°C70°F
Evening
19°C67°F
05:5214.4h20:16
SundayS 24 km/h7 m/s15 mph(gusts 521432)56%14hSunday56%S 24 km/h7 m/s15 mph (gusts 521432)14h
Sunday
S 24 km/h7 m/s15 mph(gusts 521432)56%14h
Sunday
56%
S 24 km/h7 m/s15 mph (gusts 521432)
14h
Night
18°C64°F
Morning
28°C82°F
Afternoon
28°C82°F
Evening
27°C81°F
05:5314.4h20:15
Monday5.5 mm0.22 in· heavySW 24 km/h7 m/s15 mph(gusts 571636)91%13hMonday91%SW 24 km/h7 m/s15 mph (gusts 571636)5.5 mm0.22 in13h
Monday
5.5 mm0.22 in· heavySW 24 km/h7 m/s15 mph(gusts 571636)91%13h
Monday
91%
SW 24 km/h7 m/s15 mph (gusts 571636)
5.5 mm0.22 in
13h
Night
21°C69°F
Morning
25°C77°F
Afternoon
25°C77°F
Evening
22°C72°F
05:5414.3h20:13
Sunrise
05:37
Civil Dawn 05:07
Sunset
20:33
Civil Dusk 21:03
Today vs. seasonal normal
+0.2°C+0.4°F
Cornwall is located in Ontario, Canada. Elevation: 57m. Annual average temperature: 6.2°C. Annual precipitation: 986mm.
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.
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Partly cloudy
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