Tuesday, October 14, 2025

Storm System Brings Heavy Rain, Flood Risk to Pasadena and Altadena Tuesday

A strong storm system is bringing heavy rain, thunderstorms and gusty winds to Pasadena Tuesday morning, prompting a flash flood watch for burn scar areas, according to the National Weather Service.

The cold front entered Los Angeles County around 6:00 a.m. and is expected to exit by 10:00 a.m., with showers and thunderstorms continuing for several hours afterward. Forecasters said rainfall totals in Pasadena could reach between 1 and 2 inches, with peak rates of up to 1 inch per hour.

The NWS warned of debris flows and road flooding, especially near first- and second-year burn scars. Residents in affected areas were urged to monitor weather alerts and follow instructions from emergency officials.

Winds ahead of the front could gust up to 20 mph in Pasadena, with stronger gusts of 45 to 55 mph reported in mountain and desert areas. Temperatures are significantly below normal, with a high near 61 degrees forecast for Tuesday.

Rain chances diminish by late afternoon and early evening, with clearing skies expected from west to east. A dry and warming trend will begin Wednesday and continue through Saturday.

Wednesday’s forecast calls for sunny skies and a high near 66 degrees. Temperatures will rise to 74 degrees Thursday and reach the upper 70s by Saturday. Winds will remain light, with occasional northerly breezes.

The extended forecast shows a return of marine layer clouds Sunday and Monday, with highs cooling to the upper 60s by early next week.

Forecast for Pasadena from the National Weather Service as of 4:40a.m. Tuesday:

Tuesday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 61. South southeast wind 10 to 15 mph becoming west southwest in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

Tuesday Night: A 20 percent chance of showers before 11:00 p.m. Partly cloudy, with a low around 48. South southwest wind 5 to 10 mph becoming light and variable in the evening.

Wednesday: Sunny, with a high near 66. Calm wind.

Wednesday Night: Mostly clear, with a low around 47. West southwest wind around 5 mph becoming north northeast after midnight.

Thursday: Sunny, with a high near 74.

Thursday Night: Mostly clear, with a low around 50.

Friday: Sunny, with a high near 76.

Friday Night: Mostly clear, with a low around 53.

Saturday: Sunny, with a high near 79.

Saturday Night: Mostly clear, with a low around 55.

Sunday: Mostly sunny, with a high near 76.

Sunday Night: Patchy fog. Otherwise, mostly cloudy, with a low around 52.

Monday: Patchy fog. Otherwise, partly sunny, with a high near 67.