Weather Watch

San Luis Obispo weather forecast for the week of April 20

Here is this week’s weather forecast by PG&E meteorologist John Lindsey.

Last week was characterized by a strong ridge of high pressure over California that produced persistent night and morning Santa Lucia (northeasterly) winds, clear skies, and dry and warm conditions. In contrast, a trough of low pressure will produce gentle southerly (onshore) winds, extensive night and morning low clouds and fog with areas of drizzle along with rain showers and a chance of thunderstorms in the coastal mountains. The temperatures will remain in the 60s throughout the Central Coast.

This morning’s marine low clouds will clear back to the shoreline during the afternoon hours where  overcast skies should persist most of the day. An upper-level low-pressure system will produce rain showers and a chance of thunderstorms in the coastal mountains of

San Luis Obispo and Santa Barbara counties through Thursday. In the coastal regions, the marine layer will continue to deepen over the next couple of days, which will lead to areas of drizzle and perhaps a few light rain showers Tuesday into Thursday.

Strong to gale-force (25- to 38-mph) northwesterly winds will develop along the coast later Thursday and will produce a greater amount of clearing of the coastal stratus during the afternoon into Sunday. Another low-pressure system will move southward into the Central Coast early next week. This system could produce more widespread rain, and lower temperatures.

Surf report

A 4- to 6-foot northwesterly (290-degree, deep-water) swell (with an 8- to 12-second period) is forecast along our coastline today into Tuesday.

An 8- to 10-foot northwesterly (295-degree, deep-water) swell (with an 8- to 12-second period) is forecast Wednesday, becoming a 9- to 11-foot northwesterly (310-degree, deep-water) sea and swell (with a 5- to 11-second period) Thursday into Friday. This northwesterly sea and swell will decrease to 5 to 7 feet on Saturday and 3 to 5 feet by Sunday.

The longer-range charts and models are forecasting an increasing west-northwesterly swell

April 28 and a Southern Hemisphere swell on the first few days of May.

Seawater temperatures

Seawater temperatures will range between 51 and 54 degrees through Tuesday, increasing to 52 and 56 degrees Wednesday into Thursday. 

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At PG&E, your safety is our first concern. If you live or work along the coast, you’re going to see plenty of fog and areas of drizzle this week. While driving, please reduce your speed and turn on your low-beam headlights and fog lights if you have them. Check your windshield wipers and replace them if they’re not in good shape.