Congratulations on your commute! As others said, the hill will get easier. And the advice about increasing your cadence is spot-on: my LBS guy told me to do that when I commented about hills being hard, and it's the best damn piece of advice I've gotten.

Two things that help me here in the heat/sun: long sleeved shirts, and water with lime+sugar and a bit of salt. About 1/3 teaspoon per liter of salt, I'd say - but I sweat like a pig regardless of heat, anyway