Posted Wednesday, September 9, 2026, 10:47 AM
Today's forecast is coming soon
This afternoon in San Jacinto, the weather will be very hot, and an Extreme Heat Warning and Heat Advisory remain in effect through Wednesday at 8:00 PM. A slight chance of showers will linger through the afternoon, but most of the time it stays mostly sunny with a high near 106° and heat index values as high as 108°. Temperatures ease back to around 76° overnight under partly cloudy skies.
Tomorrow stays hot and mostly sunny with a high near 104° and heat index values as high as 108°. A light southwest breeze may pick up a bit during the afternoon, then Thursday night turns mostly clear and cooler with a low around 72°. Friday brings more sunshine and a high near 97°, followed by a mostly clear Friday night with a low around 65°. The weekend trends cooler and comfortable, with highs in the low 90s on Saturday and upper 80s on Sunday, then near 90° Monday and 89° Tuesday, while overnight lows settle into the upper 50s to near 60°.
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Today:
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104°F 76°F |
Mostly sunny, dangerously hot and humid |
| 0% chance of precipitation |
| Predicted Air Quality: good,
AQI:
44 (courtesy of the SCAQMD). |
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Pollen level is rated "low-medium".
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Thursday night / Friday morning:
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| 72°F |
Mostly clear |
| 0% chance of precipitation |
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Friday:
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| 97°F |
Sunny and hot |
| 0% chance of precipitation |
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Friday night / Saturday morning:
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| 65°F |
Clear and cooler |
| 0% chance of precipitation |
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Saturday:
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| 92°F |
Sunny and cooler |
| 0% chance of precipitation |
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Saturday night / Sunday morning:
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| 59°F |
Clear |
| 0% chance of precipitation |
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Sunday:
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| 89°F |
Sunny |
| 0% chance of precipitation |
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Sunday night / Monday morning:
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| 58°F |
Mostly clear |
| 0% chance of precipitation |
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Monday:
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| 90°F |
Sunny |
| 0% chance of precipitation |
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Monday night / Tuesday morning:
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| 57°F |
Clear |
| 0% chance of precipitation |
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Tuesday:
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| 89°F |
Sunny and nice |
| 0% chance of precipitation |
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Tuesday night / Wednesday morning:
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| N/A |
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| % chance of precipitation |
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Wednesday:
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| N/A |
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| % chance of precipitation |
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