Fishing Thunder Bay, Ontario in the Spring
| Month | Avg. Air Temps °F (Hi/Lo) |
| March | 32° / 12° |
| April | 46° / 27° |
| May | 58° / 38° |
In the spring, temperatures are still cool here, especially closer to the lakefront of Thunder Bay. On Thunder Bay, the trout fishing picks up in the spring as lake trout and rainbow trout can be found much shallower during this time of year. Farther inland, the walleye and northern pike bite is going good once the walleye opener arrives. Lake trout and perch fishing is also good too on the lakes that have them. Once the end of May rolls around, the warmer temperatures help get the smallmouth bass going as well.
Fishing Thunder Bay, Ontario in the Summer
| Month | Avg. Air Temps °F (Hi/Lo) |
| June | 67° / 46° |
| July | 74° / 53° |
| August | 72° / 52° |
When summer temperatures set in, the fishing is very good here throughout the area. Early in the summer, you can still find a lot of fish shallow on the inland lakes. As the end of June rolls around, most of the lakes will start having much better fishing out in deeper water for northern pike, walleye and smallmouth bass. On Thunder Bay, the salmon fishing picks up as summer arrives and the trout will go find deeper, cooler water.
Fishing Thunder Bay, Ontario in the Fall
| Month | Avg. Air Temps °F (Hi/Lo) |
| September | 62° / 44° |
| October | 50° / 33° |
| November | 35° / 21° |
The fall provides some good fishing here throughout the area. Walleye, pike and smallmouth bass will be putting the feed bag on in the inland lakes. On many of the lakes, you will be able to catch a lot of these fish shallower in September than in August, but then a lot of fish will move deeper as water temperatures drop towards 50 degrees. On Thunder Bay, anglers target salmon and trout through the fall. The trout will continue to bite well even as water temperatures drop into October and November for the anglers that choose to go target them.
Fishing Thunder Bay, Ontario in the Winter (Ice Fishing)
| Month | Avg. Air Temps °F (Hi/Lo) |
| December | 22° / 4° |
| January | 16° / -4° |
| February | 21° / 1° |
Ice fishing is popular on the area lakes. There are businesses available to help accommodate you if you want to do a guided trip or rent ice fishing equipment. The inland lakes get fished for walleye, pike and perch through the ice. On Lake Superior, Black Bay is a popular bay for perch fishing. You can also catch lake trout, rainbow trout and whitefish on Lake Superior.
