My produce guru told me Hatch chiles are only available in Aug. What's a good sub? He recommended Anaheim..

Unfortunately the season for Hatch is pretty short although it does extend into September. I agree that Anaheim chiles are the best substitute and they are available year round.

Poblanos would be fine; fuller flavor, less grassy.If you want more heat, add a bit of jalapeno.

Anaheim provided good flavor but vert little heat.

Anaheim chiles are a good substitute for Hatch chiles and they are available in most groceries for most of the year. They are typically slightly less hot than Hatch chiles.