Dune weather summary: Buttercup Valley, 91°, 11 mph, active alert: Extreme Heat Warning. Dumont Dunes, 77°, 1 mph, active alert: Extreme Heat Warning. Hungry Valley SVRA, 78°, 10 mph, active alert: Heat Advisory. Imperial Sand Dunes / Glamis, 92°, 8 mph, active alert: Extreme Heat Warning. Johnson Valley OHV Area, 91°, 13 mph, active alert: Extreme Heat Warning. Oceano Dunes / Pismo Beach, 61°, 3 mph. Ocotillo Wells SVRA, 95°, 5 mph, active alert: Extreme Heat Warning.