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Pasadena will see a sharp drop in temperatures beginning Monday, with daytime highs falling 12 degrees or more below seasonal norms, according to National Weather Service forecasters.
The cooling trend will follow a warm and sunny weekend. A low-pressure system moving down the West Coast will deepen onshore flow and expand marine layer coverage, bringing cooler air inland and reducing daytime heating.
Thursday’s forecast is still a hot one, calling for sunny skies and a high near 95 degrees. Winds will shift from the south to southwest at 5 to 10 mph. Humidity remains elevated but lower than earlier in the week.
Friday and Saturday will be slightly cooler, with highs near 93 and 92 degrees, respectively. Skies will remain clear. Winds will stay light to moderate, generally from the southwest. Overnight lows will range from 61 to 62 degrees.
Sunday marks the start of a broader cooldown. Highs will drop to 90 degrees, then fall to 86 on Monday and 80 by Wednesday. The low-pressure system will settle along the northern California coast, increasing marine layer stratus and pushing fog into valleys.
No measurable rain is expected through the weekend. However, patchy fog and possible coastal drizzle may develop late Monday and persist into Tuesday and Wednesday mornings. Rainfall totals are expected to be negligible.
Winds will remain light and variable through the weekend. Afternoon breezes from the southwest may reach up to 10 mph. Onshore flow will strengthen next week, bringing more persistent gusts to exposed valley areas.
Weekend conditions will be favorable for outdoor events. Saturday’s high will reach 92 degrees, followed by 90 on Sunday. Overnight lows will dip to around 60 degrees. No weather advisories are in effect.
The cooling trend offers relief after a stretch of above-normal heat and humidity. Local events, including markets and civic gatherings, may benefit from milder conditions. Residents should monitor fog development early next week, especially in low-lying areas and along the Arroyo corridor.
The extended forecast calls for continued cooling. Highs will reach 86 on Monday, 81 on Tuesday and 80 on Wednesday. Patchy morning fog and increased cloud cover are expected, with limited afternoon clearing.
Forecasters expect a steady decline in temperatures beginning Sunday. Pasadena residents can anticipate sunny skies through the weekend, followed by foggy mornings and cooler afternoons next week.
Here is the latest forecast for Pasadena from the National Weather Service as of 3:14 a.m. Thursday:
Today: Sunny, with a high near 95. Light south wind becoming southwest 5 to 10 mph in the afternoon.
Tonight: Clear, with a low around 62. Southwest wind 5 to 10 mph becoming light south in the evening.
Friday: Sunny, with a high near 93. Light south southeast wind becoming southwest 5 to 10 mph in the morning.
Friday Night: Clear, with a low around 61. Southwest wind around 5 mph becoming calm in the evening.
Saturday: Sunny, with a high near 92. Light and variable wind becoming south southwest 5 to 10 mph in the morning.
Saturday Night: Clear, with a low around 61.
Sunday: Sunny, with a high near 90.
Sunday Night: Clear, with a low around 60.
Monday: Sunny, with a high near 86.
Monday Night: Patchy fog after 11:00 p.m. Otherwise, mostly cloudy, with a low around 59.
Tuesday: Patchy fog. Otherwise, mostly sunny, with a high near 81.
Tuesday Night: Patchy fog. Otherwise, mostly cloudy, with a low around 58.
Wednesday: Patchy fog. Otherwise, mostly sunny, with a high near 80.
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