warnings updated: Tuesday, October 27, 2026, 12:33 am PDT
NWS San Diego Forecast Discussion – Synopsis
Issued 1026 PM PDT Mon Oct 26 2026
Near to slightly below average temperatures expected today and tomorrow, with a cooling trend into the end of the week. Unsettled weather is expected for the weekend with increased winds and chances of precipitation. Tides will remain elevated through much of this week.
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°normal102° record (1962)
Low61°normal42° record (1940)
Sunrise7:02am
Sunset5:59pm
Moonrise6:56pm
Moonset8:51am
Illumination100%
Evaporative Cooler Effectiveness by City
Thousand Palms
Outside Temp73°F
Dew Point45°F
Est. Output61°F
Updated: Oct 27, 12:34 AM PDT
It's already a comfortable 73°F outside — running the cooler isn't needed.
Palm Desert (Hwy 111 & El Paseo)
Outside Temp67°F
Dew Point49°F
Est. Output58°F
Updated: Oct 27, 12:29 AM PDT
It's already a comfortable 67°F outside — running the cooler isn't needed.
Estimated output is 58°F — air may come out uncomfortably cool.
Palm Springs Airport
Outside Temp72°F
Dew Point42°F
Est. Output59°F
Updated: Oct 26, 11:53 PM PDT
It's already a comfortable 72°F outside — running the cooler isn't needed.
Estimated output is 59°F — air may come out uncomfortably cool.
Thermal Airport
Outside Temp69°F
Dew Point46°F
Est. Output59°F
Updated: Oct 26, 11:52 PM PDT
It's already a comfortable 69°F outside — running the cooler isn't needed.
Estimated output is 59°F — air may come out uncomfortably cool.
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)
