C and I think August is the best month for sportfishing as we enjoy fishing for silver salmon (coho).  https://roaming-nature.com/2023/08/15/long-weekend-with-coho-count/  If you want to fish and visit Denali National Park, spend several days (or more) in Southern Alaska to fish, then head north for several days (or more) in Denali. We ate a lot of salmon starting in mid-August, yum!

There are plenty of options for lodging, camping, dining and tours in August. Snow is unlikely to hamper your travel. A drive all the way through Hatcher Pass is likely possible if you have a high clearance vehicle. This route is on our wish list, but was closed by snow when we attempted it in mid-September. It usually doesn’t open until sometime in July, so there is a limited window of opportunity.

The beginning of the month is solidly summer with 17 hours of daylight (in Healy) and warm temperatures. Antlers on moose and caribou are in velvet, still growing. The days rapidly shorten throughout August and fall arrives. The colors and temperatures vary widely depending on the day and location. By the end of the month the sun is above the horizon 14 hours a day in Healy and temperatures are pleasant but often cool.

Birds begin migrating south.   Consider attending the fall Sandhill Crane Festival in Fairbanks which I greatly enjoyed. https://roaming-nature.com/2023/08/19/sandhill-crane-festival/ . There are lots of berries to pick in August including various types of blueberries.