Next 24 hours

US AQI

48Now
46
45
431 AM
41
39
394 AM
39
39
377 AM
35
33
3710 AM
40
43
441 PM
44
45
454 PM
45
45
447 PM
43
41

Air quality outlook

Worst hour each day

Today69Moderate
Thu 845Good
Fri 941Good
Sat 1073Moderate
Sun 1155Moderate

From our air-quality forecast models (GEOS-CF / GEFS aerosols). AQI uses the US EPA scale.

Live radar

Open full map

About Hamilton weather

Hamilton is in Hamilton, Ontario, Canada at 43.25°, -79.85°. Right now it’s 16° and mostly cloudy; today’s high is 22° with a 40% chance of rain.

Ontario's climate is as vast and varied as the province itself. Southern Ontario enjoys a humid continental climate moderated by the Great Lakes, producing warm, humid summers and cold winters. Northern Ontario experiences subarctic conditions with long, frigid winters and short, cool summers.