During November and December, with good but high water levels in rivers, youll find many big rainbows and browns on the move back to lakes, so chances to catch real trophy fish are good. Mornings and evenings will be quite cool, so a jacket over a thick fleece pullover is a must. Occasional rain dictates the use of top quality rain gear (see gear list) may occur. Fishing with streamers and sink tip lines are the norm. Temperatures range between 40 F and 80 F. (December is our guides choice for the best month with the most variety of water fishing well.)
In summer (mid Jan-Feb) lows range between 60 F and 75 F and highs 75-95 F. The weather is very moderate to hot, and rains are extremely rare. These long days on easy wadeable rivers are dry fly time. Lots of caddis and mayfly hatches put trout on the surface almost everywhere. Rivers that are unfishable early in the season become low enough for good fishing this time of year.
March and April, the end of the season (fall), is a peaceful and beautiful time in Patagonia. The banks and mountains are vivid with fall colors. Low water levels provide easy wading and invite you to use the lightest possible tackle on rainbows and big browns entering the rivers from the lakes to spawn. In this time you can usually fish even the most popular rivers without seeing another angler for days. As temperatures may drop without notice, bring some good warm clothes! Highs are 60-70 F and lows average 45-55 F.