warnings updated: Wednesday, November 11, 2026, 6:18 am PST
NWS San Diego Forecast Discussion – Synopsis
Issued 252 AM PST Wed Nov 11 2026
Above average high temperatures will begin to cool on Thursday. For late Thursday night into Friday, a low pressure system moving inland through Baja will bring showers, some with locally heavy rainfall near the coast. A second low pressure system will bring increasing showers for Friday night into Saturday morning along with stronger and gusty winds for the coastal waters and for the mountains and deserts. Saturday night through Sunday afternoon will be relatively drier with the next low pressure system moving inland into California Sunday night and Monday.
Covers extreme southwestern California, including Orange, San Diego, western Riverside and southwestern San Bernardino counties.
Cooling trend beginning. Highs in the upper 70s to lower 80s in the coastal basin, mid 80s in the lower desert, lower 70s in the High Desert, and 60s in the mountains.
Data Courtesy of San Diego Weather Forecast Office
Almanac information is for the Palm Springs Airport and is provided by the National Weather Service.
High81°normal96° record (1933)
Low55°normal31° record (1950)
Sunrise6:15am
Sunset4:46pm
Moonrise8:42am
Moonset6:18pm
Illumination5%
Evaporative Cooler Effectiveness by City
Thousand Palms
Outside Temp58°F
Dew Point38°F
Est. Output49°F
Updated: Nov 11, 6:24 AM PST
It's already a comfortable 58°F outside — running the cooler isn't needed.
Estimated output is 49°F — air may come out uncomfortably cool.
Palm Desert (Hwy 111 & El Paseo)
Outside Temp57°F
Dew Point43°F
Est. Output51°F
Updated: Nov 11, 6:23 AM PST
It's already a comfortable 57°F outside — running the cooler isn't needed.
Estimated output is 51°F — air may come out uncomfortably cool.
Palm Springs Airport
Outside Temp62°F
Dew Point34°F
Est. Output51°F
Updated: Nov 11, 5:53 AM PST
It's already a comfortable 62°F outside — running the cooler isn't needed.
Estimated output is 51°F — air may come out uncomfortably cool.
Thermal Airport
Outside Temp57°F
Dew Point39°F
Est. Output49°F
Updated: Nov 11, 5:52 AM PST
It's already a comfortable 57°F outside — running the cooler isn't needed.
Estimated output is 49°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)
