Pasadena Temperatures to Drop 15 Degrees by Weekend

Residents can expect cooling weather and a potential for rain as the week progresses.

Updated on Oct. 26, 2026 in Current Conditions

Craftsman-style bungalow rooftops in Pasadena under a heavy layer of overcast, cooling clouds. — Pasadena residents should prepare for a 15-degree temperature drop and potential weekend rainfall as an active weather system moves into Southern California. AI Illustration. Upload story photo >

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Is now a good time to prepare your home for incoming cooler and wetter weather?

Pasadena temperatures will decrease 15 degrees by the weekend as an active weather pattern moves into Southern California. Forecasters expect highs to drop from near 80 degrees on Monday to around 65 degrees by the weekend.

Why it matters

Increasing onshore flow and lower atmospheric heights are driving a transition to cooler, wetter conditions. This shift replaces current sunny skies with expanding cloud cover and a higher probability of precipitation.

Meteorological models indicate a cooling trend that brings highs from 80 degrees on Monday down to 65 degrees by the weekend. Most locations in the area are projected to receive approximately 1 inch of rain.

The details

Cooler conditions are being fueled by increasing onshore flow, lowering atmospheric heights, and a significant expansion of cloud cover. Rain showers are possible starting Friday night and continuing throughout the weekend.

Monday: High temperatures reach near 80 degrees with sunny skies.
Tuesday: Temperatures remain near 78 degrees under sunny conditions.
Wednesday: Highs reach 76 degrees with partly sunny skies.
Friday night: A slight chance of showers begins for the area.
Weekend: Highs drop to near 65 degrees with incoming rain.

Seasonal Patterns

This cooling trend and transition to wet conditions represent a departure from the warmer, stagnant weather patterns often monitored by the National Weather Service's Air Quality Index thresholds. The arrival of rain marks the beginning of an active weather sequence for the region.

Residents should prepare for cooler temperatures and potential rain by the weekend. Keep an eye on local forecasts for updates regarding the 1 inch of expected rainfall and adjust outdoor plans accordingly.

The takeaway

The upcoming temperature drop signals a clear end to the recent warm spell. Residents should finalize any outdoor maintenance or travel plans before the onset of wet weather on Friday night.