National Weather Service United States Department of Commerce

Unseasonably cold temperatures spreading into central U.S.

A strong cold front will usher a much colder air mass into the central and eastern U.S. for the end of the work week. Temperatures will be 10 to 20 degrees below average in some areas. Rain and snow will be possible across the Great Lakes on Friday as the system crosses the area. Heavy snow is possible in the central Appalachians Friday night.
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Current Conditions

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8 Miles S Portola Valley CA

7 Day Forecast

Overnight

Slight Chance Rain Chance for Measurable Precipitation 20%

Slight Chc
Rain

Low: 52 °F

Friday

Heavy Rain Chance for Measurable Precipitation 100%

Heavy
Rain

High: 65 °F

Friday
Night

Showers Chance for Measurable Precipitation 80%

Showers

Low: 46 °F

Saturday

Chance Showers Chance for Measurable Precipitation 40%

Chance
Showers

High: 65 °F

Saturday
Night

Patchy Fog

Patchy
Fog

Low: 44 °F

Sunday

Patchy Fog

Patchy
Fog

High: 68 °F

Sunday
Night

Mostly Clear

Mostly
Clear

Low: 44 °F

Monday

Mostly Sunny

Mostly
Sunny

High: 71 °F

Monday
Night

Partly Cloudy

Partly
Cloudy

Low: 45 °F

Detailed Forecast

  • Overnight A 20 percent chance of rain. Cloudy, with a low around 52. Light south wind.
  • Friday Showers, with thunderstorms also possible after 11am. Some of the storms could produce heavy rainfall. High near 65. Light and variable wind becoming south southeast 5 to 7 mph in the morning. Chance of precipitation is 100%.
  • Friday Night Showers and possibly a thunderstorm before 11pm, then showers likely. Some of the storms could produce small hail. Low around 46. Calm wind becoming west northwest 5 to 9 mph after midnight. Chance of precipitation is 80%.
  • Saturday A 40 percent chance of showers. Mostly cloudy, with a high near 65. Light west wind becoming west northwest 9 to 14 mph in the afternoon.
  • Saturday Night Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 44. Northwest wind 5 to 11 mph.
  • Sunday Patchy fog before 8am. Otherwise, sunny, with a high near 68.
  • Sunday Night Mostly clear, with a low around 44.
  • Monday Mostly sunny, with a high near 71.
  • Monday Night Partly cloudy, with a low around 45.
  • Tuesday Mostly sunny, with a high near 74.
  • Tuesday Night Mostly clear, with a low around 47.
  • Wednesday Sunny, with a high near 78.
  • Wednesday Night Mostly clear, with a low around 49.
  • Thursday Sunny, with a high near 77.