National Weather Service United States Department of Commerce

Active pattern for the Pacific Northwest this week while a coastal low takes aim on the Northeast later this week

Thunderstorms with heavy rainfall is forecast to bring 5 to 7 inches of rainfall, with localized heavier amounts, to the Pacific Northwest throughout the week. Across the higher mountain elevations, measurable snow is likely. The Northeast will also be the focus of showers and thunderstorms beginning mid-week as a coastal low meanders of the Mid-Atlantic coast.
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Hazardous Weather Conditions

Current Conditions

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Diamond Bar CA

7 Day Forecast

Tonight

Patchy Fog

Patchy
Fog

Low: 57 °F

Tuesday

Patchy Fog

Patchy
Fog

High: 80 °F

Tuesday
Night

Mostly Clear

Mostly
Clear

Low: 59 °F

Wednesday

Sunny

Sunny

High: 86 °F

Wednesday
Night

Mostly Clear

Mostly
Clear

Low: 62 °F

Thursday

Sunny

Sunny

High: 88 °F

Thursday
Night

Mostly Clear

Mostly
Clear

Low: 61 °F

Friday

Sunny

Sunny

High: 87 °F

Friday
Night

Mostly Clear

Mostly
Clear

Low: 62 °F

Detailed Forecast

  • Tonight Patchy fog after 11pm. Otherwise, partly cloudy during the early evening, then becoming cloudy, with a low around 57. Southwest wind 5 to 10 mph becoming east in the evening.
  • Tuesday Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 80. Light and variable wind becoming west southwest 5 to 10 mph in the afternoon.
  • Tuesday Night Mostly clear, with a low around 59. Southwest wind around 5 mph becoming calm in the evening.
  • Wednesday Sunny, with a high near 86. North northwest wind 5 to 10 mph becoming southwest in the morning.
  • Wednesday Night Mostly clear, with a low around 62. Southwest wind around 5 mph becoming east northeast in the evening.
  • Thursday Sunny, with a high near 88.
  • Thursday Night Mostly clear, with a low around 61.
  • Friday Sunny, with a high near 87.
  • Friday Night Mostly clear, with a low around 62.
  • Saturday Sunny, with a high near 81.
  • Saturday Night Partly cloudy, with a low around 62.
  • Sunday Sunny, with a high near 77.
  • Sunday Night Patchy fog after 11pm. Otherwise, mostly clear, with a low around 58.
  • Monday Patchy fog before 11am. Otherwise, sunny, with a high near 81.