San Diego’s Weather Forecast for Sunday, May 18, 2025: Hot Week Ahead!

While daytime highs on Sunday were warmer than Saturday, everyone was still below average by about 5-15 degrees.

It’ll be a much different story in the week ahead, beginning Monday when everyone is back up above normal. That puts the coast in the upper 60s to 70s, the valleys in the upper 70s to low 80s, the mountains in the low 70s to 80s, and finally, the deserts in the upper 80s to mid-90s.