warnings updated: Wednesday, October 28, 2026, 9:33 pm PDT
NWS San Diego Forecast Discussion – Synopsis
Issued 724 PM PDT Wed Oct 28 2026
A subtle cooling trend with cloudier skies and a rainier outlook is on tap as we head toward the weekend. The heaviest rainfall is expected later on Saturday into Sunday. Slightly warmer temperatures and dry weather is expected by Monday into the middle of next week.
Covers extreme southwestern California, including Orange, San Diego, western Riverside and southwestern San Bernardino counties.
For the coastal areas: 68 to 71, western valleys and inland Orange County: 69 to 73, inland valleys: 64 to 71, mountains between 4000 ft and 7000 ft: 50 to 61, high desert: 66 to 72, low desert: 78 to 82.
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
Illumination89%
Evaporative Cooler Effectiveness by City
Thousand Palms
Outside Temp73°F
Dew Point52°F
Est. Output63°F
Updated: Oct 28, 9:44 PM PDT
It's already a comfortable 73°F outside — running the cooler isn't needed.
Palm Desert (Hwy 111 & El Paseo)
Outside Temp68°F
Dew Point49°F
Est. Output59°F
Updated: Oct 28, 9:35 PM PDT
It's already a comfortable 68°F outside — running the cooler isn't needed.
Estimated output is 59°F — air may come out uncomfortably cool.
Palm Springs Airport
Outside Temp72°F
Dew Point46°F
Est. Output60°F
Updated: Oct 28, 8:53 PM PDT
It's already a comfortable 72°F outside — running the cooler isn't needed.
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)
