warnings updated: Monday, November 09, 2026, 9:03 am PST
NWS San Diego Forecast Discussion – Synopsis
Issued 329 AM PST Mon Nov 9 2026
High pressure aloft and weak offshore lower-level flow will prevail through Wednesday with high temperatures as much as 10 to 15 degrees above average for coastal areas into the western valleys. A cooling trend will follow for Thursday into early next week with a chance of mostly light showers some time for Friday into Saturday and additional chances of precipitation into next week.
Covers extreme southwestern California, including Orange, San Diego, western Riverside and southwestern San Bernardino counties.
Warm temperatures continue through mid-week. For the coastal areas: 82 to 88, western valleys and inland Orange County: 85 to 89, inland valleys: 79 to 87, mountains between 4000 ft and 7000 ft: 61 to 70, high desert: 73 to 77, low desert: 84 to 89.
Data Courtesy of San Diego Weather Forecast Office
Almanac information is for the Palm Springs Airport and is provided by the National Weather Service.
High82°normal95° record (2025)
Low56°normal37° record (1946)
Sunrise6:13am
Sunset4:47pm
Moonrise6:44am
Moonset4:48pm
Illumination0%
Evaporative Cooler Effectiveness by City
Thousand Palms
Outside Temp76°F
Dew Point48°F
Est. Output63°F
Updated: Nov 9, 9:14 AM PST
Palm Desert (Hwy 111 & El Paseo)
Outside Temp76°F
Dew Point50°F
Est. Output64°F
Updated: Nov 9, 9:08 AM PST
Palm Springs Airport
Outside Temp76°F
Dew Point40°F
Est. Output60°F
Updated: Nov 9, 8:53 AM PST
Thermal Airport
Outside Temp73°F
Dew Point47°F
Est. Output61°F
Updated: Nov 9, 8:52 AM PST
It's already a comfortable 73°F outside — running the cooler isn't needed.
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)
