Warm Week Ahead for This Time of Year

Building temperatures across Southern California will peak Friday with temperatures climbing 10 to 18 degrees above historical norms and even threatening daily records in some areas, while still remaining well below heat wave status, the National Weather Service said Tuesday.

Forecasters said Friday will be the hottest day of the week, at 91.

Temperatures could reach the mid-70s to mid-80s at the coast, upper 80s to upper 90s in valleys and foothills, and up to 104 degrees in deserts and northern inland valleys.

The warming trend began Tuesday as a weak trough exits the region. Temperatures will gradually rise through Wednesday, with most areas seeing highs within a few degrees of normal.

A cutoff low pressure system will stall over the Pacific Ocean west of Baja California starting Thursday. Despite the nearby low, a broad ridge of high pressure will set up over the western United States, causing temperatures to rise Thursday.

Saturday temperatures will trend downward but remain 8 to 15 degrees above normal, forecasters said.

Some weather models suggest an unseasonably cold pattern could develop next week with more precipitation chances, the weather service said.

Here is the latest forecast for Pasadena from the National Weather Service as of 4:42 a.m. on Tuesday, May 27:

Today: Patchy fog before 11:00 a.m. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 79. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

Tonight: Patchy fog after 11:00 p.m. Otherwise, increasing clouds, with a low around 57. South wind 5 to 10 mph.

Wednesday: Patchy fog before 11:00 a.m. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 79. Light southwest wind becoming west southwest 5 to 10 mph in the afternoon.

Wednesday Night: Patchy fog after 11:00 p.m. Otherwise, increasing clouds, with a low around 57. West southwest wind 5 to 10 mph becoming light south southwest in the evening.

Thursday: Patchy fog before 11:00 a.m. Otherwise, mostly sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon.

Thursday Night: Partly cloudy, with a low around 62.

Friday: Sunny, with a high near 91.

Friday Night: Patchy fog after 11:00 p.m. Otherwise, mostly cloudy, with a low around 64.

Saturday: Patchy fog before 11:00 a.m. Otherwise, partly sunny, with a high near 87.

Saturday Night: Patchy fog after 11:00 p.m. Otherwise, mostly cloudy, with a low around 63.

Sunday: A slight chance of rain. Patchy fog. Otherwise, partly sunny, with a high near 83.

Sunday Night: Patchy fog. Otherwise, mostly cloudy, with a low around 59.

Monday: Patchy fog. Otherwise, partly sunny, with a high near 75.