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    • Today

      Oct 1

      63° /24°F
      Partly sunny
      • Ragweed Pollen
        • Ragweed Pollen
        • Grass Pollen
        • Tree Pollen
        • Mold
        • Dust & Dander
        • Air Quality Index
      • High
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: High
      • Tree Pollen: Low
    • Sun

      Oct 2

      50° /32°
      Cooler; a little p.m. rain
      • High
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: High
      • Tree Pollen: Low
      More
    • Mon

      Oct 3

      49° /33°
      An afternoon shower or two
      • High
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: High
      • Tree Pollen: Low
      More
    • Tue

      Oct 4

      56° /29°
      Turning sunny; cool
      • High
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: High
      • Tree Pollen: Low
      More
    • Wed

      Oct 5

      63° /29°
      Cool with plenty of sun
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More

    Day

    63°Hi RealFeel® 68° Precipitation 9%
    Partly sunny
    • WSW 6 mph
    • Gusts: 10 mph
    • Max UV Index: 5 (Moderate)
    • Thunderstorms: 6%
    • Precipitation: 0 in
    • Rain: 0 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 0 hrs
    • Hours of Rain: 0 hrs

    Night

    24°Lo RealFeel® 27° Precipitation 25%
    Clear and colder
    • SW 2 mph
    • Gusts: 6 mph
    • Max UV Index: N/A
    • Thunderstorms: 0%
    • Precipitation: 0 in
    • Rain: 0 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 0 hrs
    • Hours of Rain: 0 hrs

    Portola Pollen Levels Oct 1

    • Extreme
    • Very High
    • High
    • Moderate
    • Low
    • Tree Pollen

      Low

    • Ragweed Pollen

      High

    • Mold

      Low

    • Grass Pollen

      Low

    Temperature History

    more Historical Weather Data >
      Today Normal Record 10/1/2015
    High 63° 73° N/A 57°
    Low 24° 41° N/A 50°

    Sunrise/Sunset

    • Sunrise: 6:59 AM
    • Sunset: 6:43 PM
    • Duration: 11:44 hr

    Moonrise/Moonset

    • Moonrise: 7:33 AM
    • Moonset: 7:23 PM
    • Duration: 11:50 hr
    Astronomy

    Sat. Pollen

    Sat. Dust & Dander

    Sat. Wind Maps