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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San Ramon CA

7 Day Forecast

Overnight

Slight Chance Rain Chance for Measurable Precipitation 20%

Slight Chc
Rain

Low: 55 °F

Friday

Showers Chance for Measurable Precipitation 90%

Showers

High: 64 °F

Friday
Night

Showers Likely Chance for Measurable Precipitation 70%

Showers
Likely

Low: 48 °F

Saturday

Chance Showers Chance for Measurable Precipitation 40%

Chance
Showers

High: 63 °F

Saturday
Night

Patchy Fog

Patchy
Fog

Low: 45 °F

Sunday

Patchy Fog

Patchy
Fog

High: 67 °F

Sunday
Night

Mostly Clear

Mostly
Clear

Low: 45 °F

Monday

Sunny

Sunny

High: 69 °F

Monday
Night

Mostly Clear

Mostly
Clear

Low: 45 °F

Detailed Forecast

  • Overnight A 20 percent chance of rain. Cloudy, with a low around 55. Southwest wind around 7 mph.
  • Friday Showers. High near 64. West wind 5 to 9 mph. Chance of precipitation is 90%.
  • Friday Night Showers likely and possibly a thunderstorm. Some of the storms could produce small hail. Mostly cloudy, with a low around 48. West wind 5 to 9 mph becoming light west southwest after midnight. Chance of precipitation is 70%.
  • Saturday A 40 percent chance of showers. Partly sunny, with a high near 63. West wind 10 to 14 mph, with gusts as high as 18 mph.
  • Saturday Night Patchy fog after 11pm. Otherwise, mostly clear, with a low around 45. West wind 5 to 9 mph becoming calm in the evening.
  • Sunday Patchy fog before 11am. Otherwise, sunny, with a high near 67.
  • Sunday Night Mostly clear, with a low around 45.
  • Monday Sunny, with a high near 69.
  • Monday Night Mostly clear, with a low around 45.
  • Tuesday Mostly sunny, with a high near 72.
  • Tuesday Night Mostly clear, with a low around 48.
  • Wednesday Sunny, with a high near 75.
  • Wednesday Night Mostly clear, with a low around 50.
  • Thursday Sunny, with a high near 76.