Live Weather & Forecast

Weather in Thornhill

Ontario, Canada · Real-time conditions & 3-day outlook

Flag of Canada
Partly cloudy
16°C
Feels like 16°C
60°F / Feels 60°F
Partly cloudy
Thornhill, Ontario
🌞 Daytime
Updated: 2026-04-25 10:15
💧
Humidity
96%
💨
Wind
12.2 km/h NE
🌬️
Wind Gust
15.3 km/h
🌡️
Pressure
1012 mb
👁️
Visibility
13 km
☀️
UV Index
1.8 (Low)
🌧️
Precipitation
0 mm
☁️
Cloud Cover
75%
💦
Dew Point
14.1°C
🌐
Wind Degree
39°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
182.9 μg/m³
NO₂
2.4 μg/m³
O₃
101 μg/m³
SO₂
1.9 μg/m³
PM 2.5
6.1 μg/m³
PM 10
7.3 μg/m³

Weather Alerts 4

Met · Moderate · Expected
Dense Fog Advisory issued April 25 at 3:38AM EDT until April 25 at 10:00AM EDT by NWS Louisville KY

* WHAT...Visibility less than one quarter mile in dense fog. * WHERE...Portions of south central Indiana and east central, north central, and south central Kentucky. * WHEN...Until 10 AM EDT /9 AM CDT/ this morning. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

Effective: 2026-04-25T03:38:00-04:00  ·  Expires: 2026-04-25T10:00:00-04:00
Met · Moderate · Expected
Dense Fog Advisory issued April 25 at 12:13AM EDT until April 25 at 10:00AM EDT by NWS Louisville KY

* WHAT...Visibility less than a quarter mile in dense fog. * WHERE...Portions of south central Indiana and north central, northwest, and south central Kentucky. * WHEN...Until 10 AM EDT /9 AM CDT/ this morning. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

Effective: 2026-04-25T00:13:00-04:00  ·  Expires: 2026-04-25T10:00:00-04:00
Met · Moderate · Expected
Dense Fog Advisory issued April 25 at 3:38AM EDT until April 25 at 10:00AM EDT by NWS Louisville KY

* WHAT...Visibility less than one quarter mile in dense fog. * WHERE...Portions of south central Indiana and north central, northwest, and south central Kentucky. * WHEN...Until 10 AM EDT /9 AM CDT/ this morning. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

Effective: 2026-04-25T03:38:00-04:00  ·  Expires: 2026-04-25T10:00:00-04:00
Met · Moderate · Expected
Special Weather Statement issued April 25 at 7:18AM EDT by NWS Wilmington OH

Patchy dense fog has developed this morning. Remain alert for rapid changes in visibility if driving this morning. Visibilities will improve as the morning progresses.

Effective: 2026-04-25T07:18:00-04:00  ·  Expires: 2026-04-25T09:00:00-04:00

Today's Hourly Forecast

24-hour breakdown for Thornhill, Ontario

12 AM
Clear
18°
Clear
💧 89% 💨 5.4 km/h
1 AM
Clear
18°
Clear
💧 89% 💨 5.8 km/h
2 AM
Clear
17°
Clear
💧 92% 💨 3.2 km/h
3 AM
Clear
17°
Clear
💧 93% 💨 4 km/h
4 AM
Mist
16°
Mist
💧 95% 💨 4.3 km/h
5 AM
Mist
15°
Mist
💧 96% 💨 5 km/h
6 AM
Mist
15°
Mist
💧 95% 💨 7.6 km/h
7 AM
Sunny
15°
Sunny
💧 93% 💨 6.1 km/h
8 AM
Sunny
16°
Sunny
💧 91% 💨 7.2 km/h
9 AM
Sunny
17°
Sunny
💧 83% 💨 11.5 km/h
10 AM
Partly cloudy
16°
Partly cloudy
💧 96% 💨 12.2 km/h
11 AM
Sunny
20°
Sunny
💧 77% 💨 12.2 km/h
12 PM
Partly Cloudy
21°
Partly Cloudy
💧 69% 💨 13 km/h
1 PM
Sunny
22°
Sunny
💧 62% 💨 13 km/h
2 PM
Sunny
24°
Sunny
💧 54% 💨 14 km/h
3 PM
Sunny
26°
Sunny
💧 46% 💨 15.5 km/h
4 PM
Sunny
26°
Sunny
💧 40% 💨 16.2 km/h
5 PM
Sunny
24°
Sunny
💧 37% 💨 14.8 km/h
6 PM
Sunny
23°
Sunny
💧 50% 💨 12.6 km/h
7 PM
Sunny
20°
Sunny
💧 57% 💨 10.4 km/h
8 PM
Sunny
18°
Sunny
💧 68% 💨 8.6 km/h
9 PM
Clear
17°
Clear
💧 74% 💨 9.7 km/h
10 PM
Clear
16°
Clear
💧 77% 💨 11.5 km/h
11 PM
Partly Cloudy
15°
Partly Cloudy
💧 81% 💨 13 km/h

3-Day Forecast

Daily overview for Thornhill, Ontario

Today
Sunny
Sunny
28° / 14°
🌧️ 0% chance of rain
💧 Avg. humidity: 74%
💨 Max wind: 16.2 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 6
🌅 Sunrise: 06:53 AM
🌇 Sunset: 08:28 PM
🌙 Waxing Gibbous
🌑 Moon: 60% lit
Sun, Apr 26
Sunny
Sunny
23° / 8°
🌧️ 0% chance of rain
💧 Avg. humidity: 74%
💨 Max wind: 14.4 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 7.5
🌅 Sunrise: 06:52 AM
🌇 Sunset: 08:29 PM
🌙 Waxing Gibbous
🌑 Moon: 70% lit
Mon, Apr 27
Patchy rain nearby
Patchy rain nearby
26° / 13°
🌧️ 74% chance of rain
💧 Avg. humidity: 67%
💨 Max wind: 30.2 km/h
🌧️ Total precip: 0.74 mm
☀️ UV Index: 7.4
🌅 Sunrise: 06:50 AM
🌇 Sunset: 08:30 PM
🌙 Waxing Gibbous
🌑 Moon: 79% lit

Best Time to Visit Thornhill

Plan your trip to Thornhill, Canada around the most favorable weather conditions.

Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
← Back to Thornhill 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Thornhill?
Current conditions in Thornhill: Partly cloudy, temperature 16°C, humidity 96%.
What is the best time to visit Thornhill?
The best time to visit Thornhill is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Thornhill?
Thornhill is located at approximately 38.3° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Thornhill?
The wettest period in Thornhill is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Thornhill?
For visits to Thornhill during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Thornhill in?
Thornhill is located in Canada, in the state of Ontario.
What are the public holidays in Thornhill in 2026?
View the 2026 public holidays for Thornhill on our Holidays page.
What are the GPS coordinates used for the weather forecast in Thornhill?
The weather forecast for Thornhill uses coordinates 38.2884, -85.6258.
What is the current temperature outside in Thornhill?
The current outdoor temperature in Thornhill is 16°C (61°F) with partly cloudy.
What is the hourly weather forecast for Thornhill today?
Today's hour-by-hour weather breakdown for Thornhill is shown in the Hourly Forecast section above, including temperature, rain chance, and conditions for each hour of the day.
What is the weather in Thornhill tomorrow hour by hour?
Tomorrow's forecast for Thornhill shows a high of 23°C and a low of 8°C. See the 3-Day Forecast section above for a full hourly breakdown.
What is the chance of rain today in Thornhill?
Rain is not expected in Thornhill today. Current forecast shows no significant rain probability.
Is it going to rain today in Thornhill?
No, rain is not forecast for Thornhill today. Current conditions show clear to partly cloudy skies.