San Mateo Point CA to the Mexican Border and out 30 NM Marine Forecast
| Tonight...Wind Nw 10 Kt. Seas 3 To 4 Ft. Wave Detail: Nw 2 Ft At 4 Seconds, W 3 Ft At 12 Seconds And S 1 Foot At 14 Seconds. |
| Thu...Wind W 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 2 Ft At 4 Seconds, W 3 Ft At 7 Seconds And S 1 Foot At 16 Seconds. |
| Thu Night...Wind W 10 Kt In The Evening...Becoming Variable Less Than 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 3 Ft At 7 Seconds And S 1 Foot At 17 Seconds. |
| Fri...Wind Variable Less Than 10 Kt...Becoming W 10 Kt In The Afternoon. Seas 3 To 4 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 3 Ft At 12 Seconds And S 1 Foot At 15 Seconds. |
| Fri Night...Wind Variable Less Than 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 3 Ft At 12 Seconds And S 2 Ft At 16 Seconds. |
| Sat...Wind Variable Less Than 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 3 Ft At 13 Seconds And S 2 Ft At 15 Seconds. |
| Sat Night...Wind Variable Less Than 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 3 Ft At 12 Seconds And S 2 Ft At 15 Seconds. |
| Sun...Wind Variable Less Than 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 3 Ft At 12 Seconds And S 2 Ft At 14 Seconds. |
| Sun Night...Wind Variable Less Than 10 Kt. Seas 3 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 3 Ft At 12 Seconds And S 2 Ft At 14 Seconds. |
| Mon...Wind Variable Less Than 10 Kt. Seas 3 Ft. Wave Detail: W 1 Foot At 4 Seconds, S 2 Ft At 14 Seconds And W 2 Ft At 15 Seconds. |
| Mon Night...Wind Variable Less Than 10 Kt. Seas 3 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 2 Ft At 14 Seconds And S 2 Ft At 14 Seconds. |
| Area Forecast Discussion National Weather Service San Diego CA 844am PDT Sat September 27 2025 Synopsis Showers and thunderstorms are expected through this evening, with the highest chances in the mountains and deserts. Areas of flash flooding possible where heavy rain/thunderstorms develop. Isolated showers and potentially thunderstorms have the potential to drift into the inland valleys this afternoon. Slight chances of thunderstorms continue for Sunday afternoon in the mountains, with dry conditions expected Monday. High temperatures remain well below normal with a deep marine layer through early next week. Gradual warming expected Wednesday through the end of next week. For Extreme Southwestern California Including Orange... San Diego...Western Riverside and Southwestern San Bernardino Counties Visible satellite at 9am was showing widespread cloud coverage at various levels from the coastal waters to the deserts. Radar was showing a few light showers over the mountains and deserts, with thunderstorms in Imperial County, eastern Riverside County, and eastern San Bernardino County. Mid-level moisture will continue to wrap around the north and west side of the low and into Southern California today. As destabilization occurs late this morning and afternoon, stronger showers and thunderstorms are expected to develop over the mountains and high desert, drifting into the inland valleys, Orange County, and lower deserts at times. Latest high resolution guidance maintains hourly rainfall rates of 0.50-1 inch per hour over the mountains and locally into the low deserts this afternoon. A Flood Watch is in effect for the San Diego, San Bernardino, and Riverside mountains as well as the San Gorgonio Pass, Coachella Valley, and San Diego County deserts from 11 am to 7 pm today. Main concern is the potential for debris flows over the burn scars and flooding of low-water crossings in the deserts. Any shower that drifts west into the valleys is expected to have peak rain rates of 0.20-0.30 inches per hour, if a thunderstorm develops west of the mountains those rates will likely be exceeded. The low pressure system will weaken and begin to move east on Sunday. Enough moisture and instability will remain over the area to leave a 10 to 20 percent chance of showers and thunderstorms for the mountains Sunday afternoon. Rainfall rates on Sunday are expected to be lower than Saturday, with high resolution guidance showing rainfall rates below 0.50 inch an hour. Dry conditions are expected by Monday. Minor warming is expected through Monday, although temperatures will remain several degrees below normal. An incoming short-wave trough of low pressure will begin to influence our weather on Tuesday, bringing cooler conditions with increased cloud coverage and breezy winds in the mountains and deserts. High temperatures on Tuesday will mostly be 5 to 10 degrees below average for inland areas to locally 10 to 15 degrees below average for the higher elevations of the mountains. This will be followed by slow warming through the rest of the week with high temperatures on Friday still a few degrees below average for inland areas. For now the forecast is dry beyond Sunday, though there is the potential for tropical moisture to become entrained in the southwesterly flow and into So Cal around Wednesday, but considerable spread remains the precipitable water ensemble forecasts. Marine Slight (5%) chance for a stray thunderstorm to develop over waters through tonight. Otherwise, no hazardous marine conditions are expected through Wednesday. Beaches Slight (5%) chance for a stray thunderstorm to develop at the beaches through tonight. South swell from Hurricane Narda will arrive this weekend. 4-5 feet swell with a period of 12-14 seconds will produce elevated surf and a high rip current risk Sunday through Tuesday, especially for south facing beaches, where sets could reach 8 feet, and strong alongshore currents at all beaches. More information can be found in our Beach Hazards Statement, which is in effect from 6am Sunday until 11pm Tuesday. Skywarn Skywarn activation is requested. NOAA San Diego CA Office: Watches - Warnings - Advisories CA...Beach Hazards Statement from Sunday morning through Tuesday evening for Orange County Coastal Areas-San Diego County Coastal Areas. Flood Watch until 7pm PDT this evening for Coachella Valley- Riverside County Mountains-San Bernardino County Mountains- San Diego County Deserts-San Diego County Mountains-San Gorgonio Pass near Banning. PZ...None. |
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