Dune weather summary: Buttercup Valley, 112°, 3 mph, active alert: Extreme Heat Warning. Dumont Dunes, 103°, 6 mph, heat caution: HIGH HEAT - HYDRATE. Hungry Valley SVRA, 92°, 7 mph, active alert: Extreme Heat Watch. Imperial Sand Dunes / Glamis, 116°, 7 mph, active alert: Extreme Heat Warning. Johnson Valley OHV Area, 108°, 4 mph, active alert: Extreme Heat Watch. Oceano Dunes / Pismo Beach, 81°, 14 mph. Ocotillo Wells SVRA, 115°, 1 mph, active alert: Extreme Heat Warning.