National Weather Service forecasters report Pasadena will face dangerous heat and humidity through Thursday, with highs near 100 degrees and heat index values reaching as high as 114 on Wednesday.
Tuesday will be partly sunny and hot, with a high near 96. Winds will shift southwest at 5 to 10 mph in the afternoon. Overnight lows will remain warm, around 70 degrees, under partly cloudy skies.
Wednesday is expected to be the hottest day of the week, with temperatures near 100 and oppressive humidity. Forecasters say heat index readings could exceed 110, creating hazardous conditions. Winds will remain light and variable, offering little relief.
By Thursday, highs will ease slightly to the mid-90s, though humidity will continue to drive uncomfortable conditions. Overnight lows will stay elevated, mostly in the upper 60s to low 70s, keeping homes and streets warm well into the evening.
Rain chances are minimal, with only a 20 percent chance of isolated showers Tuesday. Any activity is expected to be brief and fast-moving, limiting rainfall totals in Pasadena.
The broader trend shows temperatures holding in the 90s through Friday before cooling into the mid-80s by the weekend. Saturday and Sunday will bring sunny skies and highs near 86, with cooler nights dipping into the low 60s.
Local impacts include elevated health risks for vulnerable residents, particularly the elderly and those without air conditioning. The National Weather Service has issued heat advisories for Los Angeles County coastal valleys and beaches through Thursday, warning of dangerous conditions due to the combination of high temperatures and humidity.
Looking ahead to early next week, forecasters expect highs to rebound slightly into the upper 80s, with continued sunshine and more comfortable humidity levels.
Residents are urged to stay hydrated, limit outdoor activity during peak heat hours, and check on neighbors who may be at risk.
Here is the Pasadena forecast from the National Weather Service as of 2:41 a.m. Tuesday:
Tuesday: A 20 percent chance of showers. Partly sunny and hot, with a high near 96. Light and variable wind becoming west southwest 5 to 10 mph in the afternoon.
Tuesday Night: Partly cloudy, with a low around 70. West wind around 5 mph becoming calm in the evening.
Wednesday: Sunny and hot, with a high near 100. Heat index values as high as 114. Northeast wind around 5 mph becoming calm.
Wednesday Night: Mostly clear, with a low around 70. West southwest wind around 5 mph becoming calm in the evening.
Thursday: Sunny, with a high near 94.
Thursday Night: Mostly clear, with a low around 68.
Friday: Sunny, with a high near 91.
Friday Night: Mostly clear, with a low around 64.
Saturday: Sunny, with a high near 86.
Saturday Night: Clear, with a low around 60.
Sunday: Sunny, with a high near 86.
Sunday Night: Clear, with a low around 61.
Monday: Sunny, with a high near 88.
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