Cooling Weather System to Deliver 10-Degree Temperature Drop in Pasadena

Residents should prepare for a sharp temperature decline as a cooling system moves into the area this weekend, with Sunday’s high expected to fall 10 degrees below early May norms, according to National Weather Service forecasters.

The cooling pattern begins as Friday’s high of 74 degrees gradually diminishes to just 65 degrees by Sunday, marking a significant departure from seasonal averages.

Friday’s weather starts with a foggy, cloudy morning before clearing to mostly sunny skies with light southwest winds between 5 and 10 mph. Evening brings increasing cloud cover and overnight lows near 54 degrees.

Saturday’s forecast includes patchy morning drizzle before 11 a.m. with mostly cloudy conditions persisting throughout the day. High temperatures will reach about 69 degrees with variable morning winds shifting to southwest at 5 to 10 mph.

The system intensifies Sunday with a 30% chance of morning showers, primarily before 11 a.m. Wind patterns will shift from southeast to southwest at 5 to 15 mph with potential gusts up to 20 mph. Forecasters expect minimal rainfall amounts in Pasadena.

Any measurable precipitation will likely be less than a tenth of an inch in Pasadena, with more significant amounts reserved for mountain areas, according to the NWS.

While Pasadena will experience moderate winds, coastal areas throughout Southern California face more significant conditions with southwest to northwest gusts between 25 and 45 mph.

The cool spell won’t last long. Temperatures begin climbing by mid-week with Wednesday bringing mostly sunny conditions and highs near 75 degrees. By Thursday, the mercury should reach 81 degrees under sunny skies.

No weather advisories have been issued specifically for Pasadena, though residents should be aware of potentially slick roads during periods of drizzle or light showers, particularly Sunday morning.

Detailed Pasadena Forecast (as of 4:28 a.m. Friday, May 2):

Today: Patchy fog before 11 a.m., otherwise cloudy through mid-morning before gradual clearing. High near 74. Light southwest wind increasing to 5-10 mph afternoon.

Tonight: Increasing clouds with low around 54. Southwest wind around 5 mph becoming southeast after midnight.

Saturday: Patchy drizzle before 11 a.m. Mostly cloudy with high near 69. Light variable winds becoming southwest 5-10 mph in morning.

Saturday Night: 20% chance of showers after 11 p.m. Mostly cloudy with low around 51. South-southeast wind around 10 mph.

Sunday: 30% chance of showers, mainly before 11 a.m. Partly sunny with high near 65. Southeast wind 5-15 mph becoming southwest in morning. Gusts to 20 mph possible. Less than a tenth of an inch of precipitation expected.

Sunday Night: Patchy fog after 11 p.m. Otherwise mostly cloudy with low around 51.

Monday: Patchy fog before 11 a.m. Otherwise mostly cloudy with high near 64.

Monday Night: Mostly cloudy with low around 51.

Tuesday: Partly sunny with high near 70.

Tuesday Night: Patchy fog after 11 p.m. Otherwise mostly cloudy with low around 54.

Wednesday: Patchy fog. Otherwise mostly sunny with high near 75.

Wednesday Night: Mostly clear with low around 57.

Thursday: Sunny with high near 81.