Cities Covered
15
Monitoring locations across Ontario
Magnetic Latitude Range
51.5°–57.5° MLAT
Prime aurora viewing latitudes
Required Kp Index
Kp 5.0–7.0
Minimum activity for visibility
Free alerts for local visibility changes, tonight and through the next 72 hours.
Best chance in Ontario tonight: Thunder Bay
AuroraMe watches Kp, clouds and darkness windows so you know when to go outside.
Kp Requirements by Location
Thunder Bay
57.5° MLAT
Required Kp Levels
Kp 5.0+ Horizon
Kp 6.0+ Optimal
Kp 7.0+ Bright
Kp0Kp1Kp2Kp3Kp4Kp5Kp6Kp7Kp8Kp9
Visible on horizon
Clearly visible
Bright overhead
Sault Ste. Marie
55.6° MLAT
Required Kp Levels
Kp 6.0+ Horizon
Kp 7.0+ Optimal
Kp 8.0+ Bright
Kp0Kp1Kp2Kp3Kp4Kp5Kp6Kp7Kp8Kp9
Visible on horizon
Clearly visible
Bright overhead
Sudbury
55.4° MLAT
Required Kp Levels
Kp 6.0+ Horizon
Kp 7.0+ Optimal
Kp 8.0+ Bright
Kp0Kp1Kp2Kp3Kp4Kp5Kp6Kp7Kp8Kp9
Visible on horizon
Clearly visible
Bright overhead
Ottawa
53.7° MLAT
Required Kp Levels
Kp 7.0+ Horizon
Kp 8.0+ Optimal
Kp 9.0+ Bright
Kp0Kp1Kp2Kp3Kp4Kp5Kp6Kp7Kp8Kp9
Visible on horizon
Clearly visible
Bright overhead
Barrie
53.2° MLAT
Required Kp Levels
Kp 7.0+ Horizon
Kp 8.0+ Optimal
Kp 9.0+ Bright
Kp0Kp1Kp2Kp3Kp4Kp5Kp6Kp7Kp8Kp9
Visible on horizon
Clearly visible
Bright overhead
Peterborough
53.0° MLAT
Required Kp Levels
Kp 7.0+ Horizon
Kp 8.0+ Optimal
Kp 9.0+ Bright
Kp0Kp1Kp2Kp3Kp4Kp5Kp6Kp7Kp8Kp9
Visible on horizon
Clearly visible
Bright overhead
Visible on horizon
Clearly visible
Bright overhead
Aurora Status by City
Thunder Bay
Lake Superior port with northern lights reflecting on Great Lakes
CURRENT STATUS
Unlikely
View
Sault Ste. Marie
Border city with aurora viewing over St. Marys River
CURRENT STATUS
Unlikely
View
Sudbury
Mining city in Canadian Shield with dark skies for aurora photography
CURRENT STATUS
Unlikely
View
Ottawa
National capital with Rideau Canal aurora viewing and Gatineau Hills access
CURRENT STATUS
Unlikely
View
Barrie
Simcoe County city with Georgian Bay aurora displays
CURRENT STATUS
Unlikely
View
Peterborough
Kawartha Lakes region with cottage country aurora viewing
CURRENT STATUS
Unlikely
View
Kingston
Thousand Islands city with St. Lawrence River aurora photography
CURRENT STATUS
Unlikely
View
Oshawa
Durham Region city with Lake Ontario aurora photography opportunities
CURRENT STATUS
Unlikely
View
Brampton
Major city with 655K population
CURRENT STATUS
Unlikely
View
Toronto
Canada's largest city with rare northern lights during major storms
CURRENT STATUS
Unlikely
View
Guelph
Royal City with southern Ontario aurora viewing during major storms
CURRENT STATUS
Unlikely
View
Mississauga
Major city with 720K population
CURRENT STATUS
Unlikely
View
Showing top 12 cities by current aurora activity and magnetic latitude. Ontario has 15 total aurora viewing locations.
View all 15 cities
Best Viewing Season in Ontario
Geographic Advantages
Magnetic Latitude 51.5°–57.5° MLAT
Cities Covered 15 locations
Mean astronomical darkness at Thunder Bay, Dec–Feb 10.2–11.8 hours
Dark Sky Sites 0 Bortle 1-3
Peak Aurora Months
Estimates for Thunder Bay
October 0.63 clear nights, 72.9% cloud
September 0.61 clear nights, 65% cloud
February 0.55 clear nights, 67% cloud
Track with AuroraMe
Coverage All 15 cities
Advance Notice 30 minutes
Weather Integration Cloud cover
Predictions Best viewing times
Frequently Asked Questions
Can you see the northern lights in Ontario?
Yes, Ontario offers aurora viewing opportunities. Cities like Thunder Bay (MLAT 57.5°) can see aurora at Kp 5.0+, while southern locations need Kp 7.0+. Best viewing is September–April during dark, clear nights.
Where are the darkest skies in Ontario?
Check our city pages for specific dark sky recommendations near each location.
Learn More About the Northern Lights
Use the aurora borealis forecast, check northern lights tonight, or open the live aurora map and Kp tracker.
