Dune weather summary: Buttercup Valley, 89°, 10 mph, active alert: Extreme Heat Warning. Dumont Dunes, 74°, 3 mph, active alert: Extreme Heat Warning. Hungry Valley SVRA, 76°, 6 mph, active alert: Heat Advisory. Imperial Sand Dunes / Glamis, 91°, 8 mph, active alert: Extreme Heat Warning. Johnson Valley OHV Area, 90°, 13 mph, active alert: Extreme Heat Warning. Oceano Dunes / Pismo Beach, 61°, 0 mph. Ocotillo Wells SVRA, 93°, 4 mph, active alert: Extreme Heat Warning.