Coastal clouds are expected Thursday morning, with highs in the 80s near the coast. An Extreme Heat Warning remains in effect until 8 p.m. Thursday for coastal areas of San Diego County and nearby inland communities; mesa temperatures could reach the lower to mid-90s. Drink water, seek shade or air conditioning, and never leave children or pets in a parked car.
The coastal forecast does not represent conditions everywhere in the county. In a separate heat-wave report published August 25, 2026, The San Diego Union-Tribune listed projected Thursday highs from 88 in San Diego to 114 in Borrego Springs. Those figures describe a different event and illustrate geographic variation; they are not a historical benchmark or an explanation of the warning criteria for this forecast.
Cooler weather, then a chance of rain
Friday is forecast to be cooler, with coastal clouds and fog possible. Saturday’s high is expected near 79, with a chance of showers Saturday night. Sunday is forecast to have highs in the 70s, with stronger winds. Showers may continue Monday and Tuesday. Highs are forecast to remain in the 70s through Tuesday, with shower chances extending through Tuesday night.
The longer-term flood picture
Separately, NOAA’s annual high-tide flooding outlook reports eight observed flood days in San Diego during the 2025–2026 meteorological year. That is a historical count, not a prediction for this week.
Longer-term exposure tools answer a different question from a short-range forecast: the EPA’s description of a NOAA inundation layer says it models potential high-tide flooding at specified sea-level increments and is intended for screening. It does not forecast this week’s possible flooding.
