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Thunder Spring Trail Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
 |  |  |  | | | | | | | | |
| Partly Cloudy | Partly Cloudy | Sunny | Clear | Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy |
| Hi: 78°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 81°FHi: 27°C | Lo: 58°FLo: 14°C | Hi: 84°FHi: 29°C | Lo: 62°FLo: 17°C | Hi: 86°FHi: 30°C | Lo: 62°FLo: 17°C | Hi: 86°FHi: 30°C | Lo: 61°FLo: 16°C | Hi: 88°FHi: 31°C | Lo: 59°FLo: 15°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1222 AM PDT Mon Sep 21 2026 
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Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 159 AM PDT Mon Sep 21 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
.SHORT TERM (Today through Wednesday)... A weak upper level low pressure system will move inland through central and southern California today with high temperatures a few to around 5 degrees cooler than Sunday and as much as 5 to 10 degrees below average for the valleys. High temperatures for today will range from the lower to mid 70s near the coast to th...