Chula Vista, CA 91910 Weather

Synopsis

Scattered, mostly light showers will continue for the coast and valleys onto the coastal slopes of the mountains into this morning with more widely scattered showers possible at times for this afternoon into Saturday morning. More widespread showers will return Saturday afternoon or evening with showers possibly becoming heavy at times for late Saturday night into Sunday morning. Showers are expected to decrease on Sunday afternoon and end by Monday morning. Dry and warmer for Monday and Tuesday with high temperatures warming to around average on Tuesday. Around 5 degrees cooler for Wednesday and Thursday with a chance of showers.

Discussion

FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE: SAN DIEGO: WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES:

.SHORT TERM (Today through Sunday): Scattered showers across the coast and valleys onto the coastal slopes of the mountains have mostly produced 0.10 inch or less of rainfall for Thursday evening through 2 AM today with isolated totals to 0.25 to 0.35 inch.

Scattered, mostly light showers will continue for the coast and valleys onto the coastal slopes of the mountains into this morning with more widely scattered showers possible at times for this afternoon into Saturday with additional rainfall mostly 0.10 inch to locally 0.25 inch into Saturday morning.

More widespread showers will return Saturday afternoon or evening with showers possibly becoming heavy at times for late Saturday night into Sunday morning. Showers are expected to decrease on Sunday afternoon and end by Monday morning.

For Saturday morning through Sunday night from the coast to the mountains, the chance for 0.10 inch or more of rainfall is mostly 80 to 90 percent.

For Saturday morning through Sunday night from the coast to the mountains, the chance for 1 inch or more of rainfall ranges from 30 percent for eastern Los Angeles County to 65 to 70 percent for southern San Diego County.

For Saturday morning through Sunday night from the coast to the mountains, the chance for 2 inches or more of rainfall ranges from 10 percent for Orange and southwestern San Bernardino Counties to 35 to 45 percent over far southern San Diego County.

.LONG TERM (Monday through Thursday): Dry and warmer for Monday and Tuesday with high temperatures on Tuesday warming to around average. High temperatures on Tuesday for the coast and valleys will be mostly in the 70s, for the mountains in the mid 40s to mid 60s, and in the lower deserts around 80.

Around 5 degrees cooler for Wednesday and Thursday with a chance of showers as a pair of low pressure systems move inland into California.

Aviation

300630Z: BKN clouds based 3000-5000 ft from the coast to the mtns with SCT-BKN high clouds near 8000-1000 ft regionwide through Friday afternoon. Patchy -DZ and ISO/SCT -SHRA will continue through the night with the greatest coverage of -SHRA over coastal areas. CIGs will locally fall to 2500 feet MSL in -SHRA along with local minor vis reductions especially near the coast. -SHRA diminishes and low clouds become more FEW-SCT in coverage 14-18z. ISO-SCT -SHRA redevelop Friday afternoon for the coastal basin with highest coverage in Orange County. Coverage of BKN low clouds increases again after 00z Sat, particularly for coastal areas with ISO -SHRA becoming more confined to coastal areas as well.

Marine

No hazardous marine conditions are expected through Saturday. As a storm system moves through the coastal waters this weekend, shifting winds and seas are likely to increase by Sunday morning, possibly to hazardous levels, lingering into Monday. There is also a slight chance of thunderstorms Saturday night and Sunday morning. Stay tuned for updates.

Beaches

A Coastal Flood Advisory is in effect until 2 PM Friday. Friday's high tide is expected to peak around 7.25 feet near noon Friday which could produce minor coastal flooding as surf is expected to be around 3-5 feet.

The southwesterly swell (3 ft at 15 seconds from 200 degrees) responsible for the marginally elevated surf through the weekend will persist into Monday. As a storm system moves into the area for Sunday/Monday, increased winds could help bolster localized wave sets to 6 feet. While high tides will continue to wane into the weekend, tides will remain over 6 feet which could still lead to minor tidal overflow if breaking waves approach 4-6 feet.

Reported forecast tides have been corrected up by 1.4-1.6ft based on recent trends in tidal observations.

Climate

For San Diego, 5 of the 9 highest water levels ever recorded have occurred on Sunday through Thursday of this week with the highest on Tuesday. The water level at the peak of the highest tide on Saturday near midday will be around 1 foot lower than the highest water level on Thursday.

Highest water levels at San Diego:

1) Oct 27, 2026: 2.80 feet MHHW (8.52 feet MLLW) 2) Oct 26, 2026: 2.72 feet MHHW (8.44 feet MLLW) 3) Oct 28, 2026: 2.71 feet MHHW (8.43 feet MLLW) 4t) Jul 14, 2026: 2.54 feet MHHW (8.26 feet MLLW) 4t) Nov 25, 2015: 2.54 feet MHHW (8.26 feet MLLW) 6) Aug 02, 2023: 2.53 feet MHHW (8.25 feet MLLW) 7) Oct 29, 2026: 2.49 feet MHHW (8.21 feet MLLW) 8) Dec 13, 2012: 2.45 feet MHHW (8.17 feet MLLW) 9) Oct 25, 2026: 2.40 feet MHHW (8.12 feet MLLW)

Skywarn

Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions.

Watches, warnings and advisories

CA: Coastal Flood Advisory until 2 PM PDT this afternoon for Orange County Coastal Areas-San Diego County Coastal Areas.

PZ: None.