Optimum Water Temperatures for Fly Fishing

Fish don’t do much if water is too hot or too cold, so you might not want to waste your time fly fishing in certain weather conditions. Use this guide, (along with a thermometer) to decide if you’re going to fish or stay home and clean your fly gear. (All temperatures are in Fahrenheit.)

Type of Fish	Lower Limit	Optimum	Upper Limit
Freshwater
Bluegill	58˚	69˚	75˚
Brook Trout	44˚	58˚	70˚
Brown Trout	44˚	56˚– 65˚	75˚
Channel Catfish	55˚	82˚– 89˚	na
Coho Salmon	44˚	54˚	60˚
Lake Trout	42˚	50˚– 59˚	na
Largemouth Bass	50˚	65˚– 75˚	85˚
Muskellunge	55˚	63˚	72˚
Northern Pike	56˚	63˚	74˚
Rainbow Trout	44˚	61˚	75˚
Smallmouth Bass	60˚	65˚– 68˚	73˚
Walleye	50˚	67˚	76˚
Saltwater
Bluefish	50˚	62˚– 72˚	84˚
Bonefish	64˚	75˚	88˚
Cod	31˚	44˚– 49˚	59˚
Dolphin Fish	70˚	75˚	82˚
Fluke	56˚	66˚	72˚
Red Snapper	50˚	57˚	62˚
Redfish	52˚	71˚	90˚
Snook	69˚	70˚– 75˚	90˚
Speckled Trout	48˚	72˚	81˚
Tarpon	74˚	na	100˚+

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Source:http://www.dummies.com/how-to/content/optimum-water-temperatures-for-fly-fishing.html