'Dangerously hot conditions': Excessive Heat Warning in effect for these areas

SAN DIEGO (FOX 5/KUSI) -- The National Weather Service has issued Excessive Heat Warnings for parts of San Diego County, where temperatures are expected to reach triple digits this week.

The warnings for the county's deserts, inland valleys and mountains took effect Wednesday at 11 a.m. and will go until Friday at 8 p.m. NWS is warning of "dangerously hot conditions" in these areas, especially on Thursday, which is expected to be the hottest day of the week. Little changes in temperature are expected Wednesday and Friday.

In the deserts, temperatures were expected to get as high as 112 to 118 degrees during the day, with low temperatures dipping to the 80s to mid 90s at night.

Temperatures were forecasted to get as high as 100 to 108 degrees in the inland valleys, with highs in the mid to upper 90s along the Interstate 15 corridor. Temperatures were expected to get down to the low to mid 70s at night.

In the mountains, temperatures could reach the mid 90s to 102 degrees, with mountain slopes expected to be the warmest, NWS said. Low temperatures will get down to the mid 70s.

Residents in these areas are advised to drink lots of fluids, stay out of the sun and seek air conditioning to avoid heat-related illness.