warnings updated: Wednesday, October 28, 2026, 12:48 am PDT
NWS San Diego Forecast Discussion – Synopsis
Issued 1039 PM PDT Tue Oct 27 2026
Cooling will spread inland as we approach the weekend, with high temperatures on Sunday around 10 to 15 degrees below average for inland areas. Chances for showers will begin increasing on Friday and be highest late Saturday into early Sunday. Chances for rainfall will be around 45 to 55 percent for 0.50 inch or more from the coast to the mountains, with a 35 to 40 percent chance for 1 inches or more. Tides will remain elevated through much of this week with near record water levels resulting in coastal flooding.
Covers extreme southwestern California, including Orange, San Diego, western Riverside and southwestern San Bernardino counties.
Coastal Flood Warning goes into effect at 5 AM Sunday as high tides are expected to increase over 7.5 feet. Coastal flooding is expected during each morning high tide through Thursday.
Data Courtesy of San Diego Weather Forecast Office
Almanac information is for the Palm Springs Airport and is provided by the National Weather Service.
High87°normal101° record (1965)
Low61°normal43° record (1940)
Sunrise7:03am
Sunset5:58pm
Moonrise7:51pm
Moonset10:04am
Illumination94%
Evaporative Cooler Effectiveness by City
Thousand Palms
Outside Temp69°F
Dew Point51°F
Est. Output60°F
Updated: Oct 28, 12:56 AM PDT
It's already a comfortable 69°F outside — running the cooler isn't needed.
Palm Desert (Hwy 111 & El Paseo)
Outside Temp64°F
Dew Point48°F
Est. Output56°F
Updated: Oct 28, 12:53 AM PDT
It's already a comfortable 64°F outside — running the cooler isn't needed.
Estimated output is 56°F — air may come out uncomfortably cool.
Palm Springs Airport
Outside Temp67°F
Dew Point44°F
Est. Output57°F
Updated: Oct 27, 11:53 PM PDT
It's already a comfortable 67°F outside — running the cooler isn't needed.
Estimated output is 57°F — air may come out uncomfortably cool.
Thermal Airport
Data temporarily unavailable
Unable to reach the NWS METAR feed
How to Read This
Score
0–100, based on the wet-bulb depression — how much cooler the air could get versus the actual outside temperature. Drier air means more room to cool, so a bigger gap scores higher.
Wet-Bulb Depression
The gap between the outside (dry-bulb) temperature and the wet-bulb temperature — the coolest evaporation alone could get the air. A bigger gap means drier air and more room for the cooler to work with.
Estimated(Est.) Output
The approximate temperature of the air coming out of the cooler, estimated by cooling the outside temperature most of the way toward the wet-bulb temperature.
Efficiency
These numbers assume 80% saturation efficiency — typical for a well-maintained direct (single-stage) evaporative cooler.
Lower dew point + higher temp = better cooling
(This guide generally will work for misting systems also)
