Thunder Bay gas prices this week

185.0¢/L is the latest weekly figure for regular in Thunder Bay, collected for the week of September 28; it moved −14.6¢ since the week before. Thunder Bay a year back: 130.0¢/L. Change since: +55.0¢.

Ontario averaged 179.8¢/L; Thunder Bay, at +5.2¢ from that, ranks 11th of 13. From 113.4¢/L (December 29, 2025) to 219.1¢/L (June 6, 2022): the five-year band for Thunder Bay.

Thunder Bay sits on the north shore of Lake Superior, far from the refineries of southern Ontario, and Ontario also publishes a separate monthly price breakdown for it. Thunder Bay's structural gap to the provincial average across the last 52 weeks: −1.8¢. In 2026 it ranked cheapest of the 13 markets for 3 weeks, dearest for 5 weeks. Thunder Bay's biggest one-week jump this year: +40.9¢, recorded for the week of May 4.

For diesel, Thunder Bay shows 262.5¢/L; the premium over regular is 77.5¢/L. Since the survey four weeks back (159.6¢/L), Thunder Bay regular has moved +25.4¢; premium is 213.6¢/L (28.6¢/L more).