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WeatherLive › Ontario › Cornwall

Cornwall, ON Weather

Today Hourly 10-Day Weekend Monthly Radar Air Quality Climate
Current WeatherCornwall · 9:36 PM EDT
72° | 53°
59°F
Feels like 57°
Sunny
WindSW 5 mph · Gusts 11 mph
Precip8% · –
Humidity76% · Dew point 52°
UV index7 High
Air Quality55 Moderate
Pressure30.18 inHg
Visibility6 mi
Sunrise / Sunset6:00 AM · 8:06 PM · 14h 6m

Weather map — Cornwall

Full radar →
Now
59°
8%
5 mph
22:00
58°
9%
5 mph
23:00
57°
9%
4 mph
00:00
56°
10%
3 mph
01:00
54°
11%
2 mph
02:00
53°
12%
2 mph
03:00
53°
12%
1 mph
04:00
52°
12%
1 mph
05:00
51°
12%
2 mph
06:00
51°
12%
2 mph
07:00
53°
11%
3 mph
08:00
58°
8%
3 mph
09:00
62°
6%
4 mph
10:00
66°
7%
5 mph
11:00
69°
6%
5 mph
12:00
70°
6%
5 mph
13:00
73°
5%
5 mph
14:00
75°
5%
5 mph
15:00
73°
6%
6 mph
16:00
67°
10%
7 mph
17:00
66°
10%
7 mph
18:00
66°
18%
8 mph
19:00
65°
23%
5 mph
20:00
60°
0.02 in
5 mph

Today · Sat 8/15

High 72°
8% / –

Sunny. Winds NW at 8 mph.

Tonight · Sat 8/15

Low 51°
9% / –

Sunny. Winds SW at 5 mph.

Tomorrow · Sun 8/16

75° | 51°
43% / 0.03 in

Sunny. Winds E at 8 mph.

7-day trend

Cornwall · temperature + precipitation

10-day forecast

Updated 9:36 PM

Details & indices

Wind
5 mph SW
Gusts 11 mph
Humidity
76%
Dew point 52°
Pressure
30.18 inHg
Rising
UV index
7 — High
High today
Air Quality
Moderate
AQI 55 · US EPA
Allergy
Very high
Mugwort
Visibility
6 mi
Clear view
Allergy — Cornwall

🌿 Conditions right now

View all →
Birch
None
Grass
High
Oak
None
Alder
None
Hazel
None
Mugwort
Very high
Ragweed
None

Sun & moon

Sunrise6:00 AM
Sunset8:06 PM
Length of day14h 6m
Moonrise9:26 AM
Moonset9:16 PM
Moon phase🌒 Waxing Crescent · 13%
Next full moonAug 28 Sturgeon Moon
Latitude45.0181°N
Longitude-74.7281°E

Water temps nearby

View all →
No beaches within 50 miles
🌤️No rain expected in the next 90 minutes
Now+30+60+90 min
Minute-by-minute precip · HRRR nowcast

Daily planner

computed from today's forecast
Laundry day
Great
Line-drying weather
Grilling
Great
Fire up the grill
Running
Fair
Lace up outside
Patio
Great
Dinner outdoors
Nearby places in {{REGION}}
Toronto
Sunny
76°
Ottawa
Sunny
63°
Mississauga
Sunny
70°
Brampton
Sunny
71° 🌤️
Hamilton
—
— 🌤️
London
—
—
Data sources · Saturday, August 15
Where the Cornwall forecast comes from
This page blends NOAA/NWS model guidance with global ensembles for the 10-day outlook, air quality and alerts. Data refreshes every hour, current conditions every 15 minutes. Coordinates: 45.0181°N, -74.7281°.
NBM + global weather models
Updated: 9:36 PM
Weather in Cornwall
Over the next 10 days Cornwall tops out around 82° (Monday) and dips to 51° on the coolest night (Sunday). Models drop roughly 0.65 in of precipitation across the stretch — watch Saturday (90%). The NWS alert board for this area is currently clear. Right now Cornwall is about 11° cooler than nearby Montréal. Longer view: four full seasons with serious winter and real summer heat.
Cornwall, ON · Elev 194 ft · 45.02°N, 74.73°W · Ontario · Forecast computed for these exact coordinates
Powered by NWS/NOAA guidance, multi-model forecasts and official environmental feeds · NOAA/NWS · EPA AirNow · MET Norway · global models
Updated: 9:36 PM