Fire danger elevated as Santa Ana winds, temps pick up for San Diego County

Oct 29, 2025 - 09:00

High pressure and periods of offshore flow will bring warmer and drier weather to San Diego County this week, elevating fire danger, according to the National Weather Service.

Santa Ana winds will be here Monday night through Wednesday as high pressure briefly sets up to our Northeast.

A heat advisory is in effect for inland valleys and foothills until 7 p.m. on Wednesday, with temperatures expected to be around 10 to 15 degrees above normal. Highs will mostly be in the mid-90s by Wednesday inland, NBC 7 Meteorologist Sheena Parveen said.

Near-normal temps Sunday and Monday, before warmer weather arrives for mid week! It's been awhile since we've needed to talk about Heat Safety, but with highs in the 90s for inland areas/valleys, make sure to drink plenty of water if you plan to spend significant time outdoors. pic.twitter.com/If2oY7TgMY— NWS San Diego (@NWSSanDiego) October 25, 2025

The offshore flow will peak Tuesday afternoon through Wednesday morning, producing easterly winds locally, gusting 35-45 mph in the mountains and coastal foothills of San Diego County. The offshore flow will also bring significantly lower humidity to the inland areas, especially on Tuesday afternoon, when relative humidity could reach as low as 12% in the inland valleys.

Highs along the coast will range in the low to mid-80s this week, mid- to upper 80s inland, with a chance to reach 90. San Diego County mountains will be in the upper 70s this week, with the deserts in the upper 80s.

Our Santa Ana conditions will usher in drier air, so beware of increased fire danger around the county. Santa Ana conditions are expected to peak on Wednesday, continuing into Thursday, but tapering off by the afternoon and evening.

By Thursday, these Santa Ana conditions will weaken, then we will cool more on Friday for Halloween. Friday evening will be pleasant for the trick-or-treaters.

Wednesday temperatures: