Weather Watch

SLO County weather forecast for the week of May 12

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

Weather report

Warm to hot conditions are expected to be the story this week as a strong ridge of high pressure builds across the Central Coast. This high-pressure ridge is likely to produce a pattern of gentle to moderate (8 to 18 mph) Santa Lucia (northeasterly) winds during the night and morning hours, which is expected to give low relative humidity levels, clear skies and significant warming. This heat wave is forecast to last through at least Wednesday along the beaches and coastal valleys, and through Thursday in the North County.

Temperatures will be 20 to 25 degrees above normal across San Luis Obispo County.

Maximum temperatures today through Wednesday could reach the 80s at the beaches, 90s in the coastal valleys and the season’s first triple-digit readings in the North County.

Warm indeed!

Coastal regions will begin to cool Thursday into Friday as the northwesterly winds pick up.

Further cooling is then likely to occur by the weekend as high pressure should weaken and cool northwesterly winds are expected to spread across the Central Coast, with morning low clouds and fog likely to return. However, temperatures should remain slightly above normal through the weekend.

Today’s surf report

Today’s 3- to 5-foot northwesterly (315-degree, deep-water) sea and swell (with a 5- to 9-second period) will become a 3- to 4-foot northwesterly (300-degree, deep-water) swell (with an 8- to 11-second period) Tuesday through Wednesday.

Increasing northwesterly winds will generate a 4- to 6-foot northwesterly (315-degree, deep-water) sea and swell (with a 5- to 10-second period) Thursday through Friday, increasing over the weekend.

A 2- to 3-foot Southern Hemisphere (180-degree, deep-water) swell (with a 16- to 18-second period) will arrive along our coastline Wednesday and remain at this height but with a gradually shorter period Thursday into Friday.

Seawater temperatures

Prolonged northwesterly winds have caused tremendous amounts of upwelling to develop along the coastline, producing the coldest seawater temperatures of the year.

Seawater temperatures will range from 49 to 52 degrees through Tuesday, increasing to 51 to 54 degrees Wednesday through Friday.