Let the Cool Down Begin

A low-pressure system moving into Northern California is bringing cooler temperatures and morning drizzle to Pasadena through Thursday, according to the National Weather Service.

Highs will fall from 83 degrees on Tuesday to around 78 degrees Thursday, with deep marine layer clouds expected to reach well inland. Forecasters said the cooling trend will continue through midweek before a modest warming begins Friday.

Tuesday’s forecast calls for mostly sunny skies and a high near 83. Winds will shift from southeast to south at 5 to 10 mph. Overnight, clouds will increase and temperatures will drop to 57 degrees.

Wednesday will bring patchy drizzle and fog before 11:00 a.m., followed by gradual clearing and a high near 79. Winds will move from southeast to south-southwest at 5 to 10 mph. Wednesday night will be cloudy with a low near 56. Thursday will be mostly sunny with a high near 78.

Temperatures will remain 6 to 12 degrees below seasonal norms through Thursday. A warming trend begins Friday, with highs climbing to 79 and peaking near 83 on Saturday.

Winds will remain light across Pasadena, ranging from 5 to 10 mph. Advisory-level gusts are forecast in interior passes and canyons of the San Gabriel Mountains through Tuesday evening due to moderate onshore flow.

The weekend outlook includes sunny skies and warming temperatures. Saturday’s high will reach 83, followed by 81 on Sunday. Overnight lows will remain in the upper 50s.

Forecasters said the deeper marine layer may affect morning commutes with low visibility and damp roads, especially in hillside neighborhoods and along the Arroyo.

The extended forecast shows continued mild conditions into next week. Monday and Tuesday are expected to be sunny, with highs in the low 80s and overnight lows in the upper 50s.

Here is the latest forecast for Pasadena from the National Weather Service as of 3:20 a.m. Tuesday:

Today: Mostly sunny, with a high near 83. Light southeast wind becoming south 5 to 10 mph in the morning.

Tonight: Increasing clouds, with a low around 57. Southwest wind 5 to 10 mph becoming southeast after midnight.

Wednesday: Patchy drizzle and fog before 11:00 a.m. Cloudy through mid morning, then gradual clearing, with a high near 79. Southeast wind 5 to 10 mph becoming south southwest in the afternoon.

Wednesday Night: Increasing clouds, with a low around 56. South southeast wind 5 to 10 mph.

Thursday: Mostly sunny, with a high near 78. South southwest wind 5 to 10 mph.

Thursday Night: Patchy fog after 11:00 p.m. Otherwise, mostly cloudy, with a low around 56.

Friday: Patchy fog before 11:00 a.m. Otherwise, mostly sunny, with a high near 79.

Friday Night: Mostly clear, with a low around 58.

Saturday: Sunny, with a high near 83.

Saturday Night: Mostly clear, with a low around 58.

Sunday: Sunny, with a high near 81.

Sunday Night: Mostly clear, with a low around 57.

Monday: Sunny, with a high near 82.