High temperatures are expected to persist through Wednesday in Pasadena and surrounding areas, with limited chances of thunderstorms locally, according to forecasters.
Monsoonal moisture may bring spotty showers or isolated thunderstorms Tuesday, but the greatest activity is expected to remain in the San Gabriel Mountains and foothill areas. Pasadena itself is forecast to stay mostly dry, with only a slight chance of brief afternoon storms.
Highs will reach about 99 degrees, with heat index values near 105.
Tuesday night will be mostly clear with lows near 68 degrees and light winds shifting from southwest to east-northeast.
Wednesday will remain hot and mostly sunny, with a high near 97 degrees. Storm chances will continue to focus on the mountains and eastern valleys rather than the city.
A cooling trend begins Thursday, with highs dropping to around 92 degrees as a stronger marine layer and increased onshore flow move inland.
By the weekend, skies will stay sunny with highs near 90 degrees Friday and 87 degrees Saturday. Overnight lows will hold in the low 60s.
Beyond the flood watch, no additional weather advisories were posted as of Tuesday morning. The extended forecast shows stable conditions through early next week, with highs in the upper 80s and no significant rain expected.
Here is the latest forecast for Pasadena from the National Weather Service as of 3:28 a.m. Tuesday:
Overnight: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Northwest wind around 5 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday: A chance of showers and thunderstorms, mostly in foothills and mountains. Partly sunny and hot, with a high near 99. Calm wind becoming south southwest around 5 mph in the morning. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night: A 20 percent chance of showers before 11:00 p.m. Partly cloudy, with a low around 68. Southwest wind around 5 mph becoming east northeast after midnight.
Wednesday: Mostly sunny and hot, with a high near 97. Heat index values as high as 105. East northeast wind around 5 mph becoming southwest in the afternoon.
Wednesday Night: Mostly clear, with a low around 66. Southwest wind around 5 mph becoming east after midnight.
Thursday: Sunny, with a high near 92.
Thursday Night: Mostly clear, with a low around 64.
Friday: Sunny, with a high near 90.
Friday Night: Mostly clear, with a low around 63.
Saturday: Sunny, with a high near 87.
Saturday Night: Mostly clear, with a low around 62.
Sunday: Sunny, with a high near 88.
Sunday Night: Mostly clear, with a low around 62.
Monday: Sunny, with a high near 87.
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