How long will the heat last in Southern California?

LOS ANGELES — The Southland will bask in above-normal temperatures again Friday as a result of a strengthening ridge of high pressure and weak offshore winds, the National Weather Service said.

Combined with humidity levels only in the teens, the conditions are creating an elevated fire danger but nothing critical, according to National Weather Service meteorologists.

Downtown L.A., where the normal high for this time of the year is 78 degrees, is forecast to reach 87 Friday and Saturday, then decline to 83 Sunday and revert to a normal 78 on Monday.

Burbank, where the normal high is also 78, will reach 91 Friday and Saturday, fall back to 85 Sunday and 79 Monday.

A similar pattern is expected in Orange County. Such weak temperature spikes at this time of the year are nothing very much out of the ordinary, according to forecasters.

Another major element in Friday’s weather is dense fog in the L.A. area this morning.

The National Weather Service forecast sunny skies in LA County Friday and highs of 76 on Mount Wilson; 79 at LAX; 80 in Avalon; 81 in San Pedro and Torrance; 84 in Lancaster; 85 in Palmdale; 87 in Long Beach and downtown LA; 90 in Santa Clarita, Whittier and San Gabriel; 91 in West Covina, Burbank, North Hollywood and Van Nuys; 92 in Pasadena; and 93 in Northridge and Woodland Hills. Temperatures should be about the same Saturday and begin to decline Sunday.

Sunny skies were also forecast in Orange County, along with highs of 71 in San Clemente; 73 on Santiago Peak; 74 in Laguna Beach; 75 in Newport Beach; 84 at the 2600-foot level on Ortega Highway; 85 in Santa Ana, Irvine and Fremont Canyon; 87 in Anaheim; 88 in Fullerton and Yorba Linda; 89 in Mission Viejo; and 90 at Trabuco Canyon.