Pasadena Temperatures to Peak Near 86 Before Weekend Cooling and Rain Chances Arrive

Pasadena residents can expect several more days of sunny, unseasonably warm weather before a significant cooling trend arrives later this week, with the first chance of rain in weeks developing over the weekend, according to the National Weather Service.

Temperatures are forecast to climb from a high of 83 degrees Monday to 85 degrees Tuesday and 86 degrees on Veterans Day Wednesday as a strong ridge of high pressure remains parked over Southern California. Forecasters said temperatures will remain 10 to 15 degrees above normal through midweek under clear, dry conditions.

Monday will be sunny with a light northeast wind early, shifting south-southeast later in the day. Overnight temperatures will fall to about 56 degrees under partly cloudy skies.

The warm pattern will persist through Wednesday, with abundant sunshine and only light offshore winds. The dry air mass will also allow for cool overnight lows, especially in sheltered areas.

A change in the weather pattern begins Thursday as the ridge weakens and onshore flow returns. High temperatures are expected to slip to 82 degrees Thursday, followed by 79 degrees Friday.

Forecasters said the cooling will become more noticeable heading into the weekend. Saturday’s high is forecast near 77 degrees before temperatures drop to around 71 degrees Sunday.

The weekend forecast also brings Pasadena’s first meaningful opportunity for rainfall. While forecast models continue to vary on the timing and strength of an approaching storm system, National Weather Service forecasters said the first realistic chance of precipitation arrives Saturday.

A slight chance of rain is forecast Saturday night, followed by likely rain at some point Sunday. Forecasters estimate a 30% to 40% chance of rain between Saturday and Monday, although confidence remains low regarding exact timing and rainfall amounts.

Recent forecast trends suggest the storm may track farther south and move more slowly than earlier projections, reducing the likelihood of heavier rainfall.

Increasing cloud cover could arrive as early as Friday, when marine layer clouds and higher-level moisture may spread across the region as cooler air moves into Southern California.

Winds are expected to remain relatively light throughout the week, generally around 5 mph, with no advisory-level conditions anticipated.

The forecast should provide favorable weather for outdoor activities, community events and Veterans Day observances through midweek. Residents planning weekend activities, however, may want to monitor updated forecasts as confidence improves regarding the timing of potential rainfall.

Looking ahead, forecasters said an active weather pattern could continue into next week, keeping the door open for additional chances of precipitation after the initial weekend system moves through the area.

For now, Pasadena’s forecast features a classic autumn transition, with summerlike warmth giving way to cooler temperatures and the possibility of much-needed rain by the end of the week.

Here is the Pasadena forecast from the National Weather Service as of 2:48 a.m. Monday:

Today: Sunny, with a high near 83. Northeast wind around 5 mph becoming south southeast in the morning.

Tonight: Partly cloudy, with a low around 56. North northeast wind around 5 mph.

Tuesday: Sunny, with a high near 85. Calm wind becoming southwest around 5 mph.

Tuesday Night: Clear, with a low around 56. North northeast wind around 5 mph.

Veterans Day: Sunny, with a high near 86. North northeast wind around 5 mph becoming calm in the morning.

Wednesday Night: Clear, with a low around 60.

Thursday: Sunny, with a high near 82.

Thursday Night: Mostly clear, with a low around 59.

Friday: Mostly sunny, with a high near 79.

Friday Night: Partly cloudy, with a low around 58.

Saturday: Mostly sunny, with a high near 77.

Saturday Night: A slight chance of rain. Partly cloudy, with a low around 56.

Sunday: Rain likely. Partly sunny, with a high near 71.