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Official · NWS

Heat Advisory

until 5:00 am

Heat Advisory issued October 3 at 2:02AM PDT until October 5 at 10:00PM PDT by NWS San Francisco CA

Full text

* WHAT...Hot conditions with maximum temperatures in the mid-90s to low-100s. Mild minimum temperatures and weak onshore flow will limit overnight relief. * WHERE...The East Bay and San Francisco Bay Shoreline, North Bay Interior Mountains and Valleys, The Santa Clara Valley and Eastern Hills, The Santa Cruz Mountains, Interior Monterey County and the Santa Lucia Range, Most of San Benito County and the Cholame Hills in Southeast Monterey County, and Southern Salinas Valley/Arroyo Seco and Lake San Antonio. * WHEN...From 11 AM this morning to 10 PM PDT Monday. * IMPACTS...This level of heat affects anyone without effective cooling and/or adequate hydration. Impacts likely in some health systems, heat-sensitive industries and infrastructure.

Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

Sonoma Coastal Range; North Bay Interior Mountains; North Bay Interior Valleys; San Francisco Bay Shoreline; East Bay Interior Valleys; Santa Cruz Mountains; Santa Clara Valley Including San Jose; Eastern Santa Clara Hills; East Bay Hills; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park

Computed

Heat advisory

Sat

Feels-like high near 33°C.

Computed

Heat advisory

Sun

Feels-like high near 33°C.

Computed

Heat advisory

Mon

Feels-like high near 32°C.

San Jose Hourly Weather

California 3:58 am local updated now

Clear sky

64°

Clear sky

Feels like 64°

94° 64° today's high / low

+14.6° vs normal — much warmer than normal

100

Perfect

Outdoor comfort right now

It is 64°F and clear sky in San Jose. Nothing wet on the radar for the next 24 hours. Tomorrow: partly cloudy, high 93°F.

  • Pressure steady slowly 29.86 inHg
  • Wind 4 mph SW
  • Humidity 76%
  • Cloud 0%
  • UV peak 8
  • Rain chance 0%

Next 48 hours

Scroll sideways — or pick a day below.

Now

Clear sky

0

4am

Partly cloudy

1

5am

Partly cloudy

1

6am

Partly cloudy

1

7am

Partly cloudy

2

8am

Clear sky

1

9am

Clear sky

1

10am

Clear sky

1

11am

Clear sky

2

12pm

Clear sky

3

1pm

Clear sky

4

2pm

Clear sky

5

3pm

Clear sky

6

4pm

Clear sky

8

5pm

Clear sky

8

6pm

Clear sky

6

7pm

Clear sky

4

8pm

Clear sky

3

9pm

Clear sky

2

10pm

Clear sky

1

11pm

Clear sky

1

12am

Sun

Clear sky

1

1am

Clear sky

1

2am

Partly cloudy

1

3am

Partly cloudy

1

4am

Partly cloudy

1

5am

Partly cloudy

1

6am

Partly cloudy

1

7am

Partly cloudy

1%

1

8am

Partly cloudy

1%

1

9am

Partly cloudy

1%

1

10am

Partly cloudy

1%

1

11am

Partly cloudy

2

12pm

Partly cloudy

2

1pm

Partly cloudy

4

2pm

Partly cloudy

5

3pm

Partly cloudy

7

4pm

Partly cloudy

8

5pm

Clear sky

7

6pm

Clear sky

6

7pm

Clear sky

4

8pm

Clear sky

3

9pm

Clear sky

2

10pm

Clear sky

2

11pm

Clear sky

2

12am

Mon

Clear sky

2

1am

Clear sky

2

2am

Clear sky

1

Conditions in detail

  • Feels like

    64°

    About what it looks like

  • Dew point

    58°

    Comfortable

  • Wind

    4 mph

    Gusting 6 mph from SW

  • Pressure

    29.85 inHg

    Steady slowly

  • Visibility

    9.9 mi

    Clear

  • UV index

    0

    Peaks at 8 today

  • Cloud cover

    0%

    —

  • Precipitation today

    0.00"

    None expected

Air quality

US AQI

67

Moderate

  • PM2.5 26 µg/m³
  • PM10 29 µg/m³
  • Ozone 26 µg/m³
  • NO₂ 43 µg/m³

Hour-by-hour forecast for San Jose

Every hour for the next 48 hours, local time.

Time Conditions Temp Feels Chance Amount Wind Humidity
Saturday Oct 3
3am Clear sky Clear sky 66° 66° 0% — 0 mph 76%
4am Partly cloudy Partly cloudy 65° 65° 0% — 1 mph 68%
5am Partly cloudy Partly cloudy 64° 64° 0% — 1 mph 67%
6am Partly cloudy Partly cloudy 65° 65° 0% — 1 mph 66%
7am Partly cloudy Partly cloudy 64° 64° 0% — 2 mph 64%
8am Clear sky Clear sky 66° 66° 0% — 1 mph 62%
9am Clear sky Clear sky 71° 71° 0% — 1 mph 56%
10am Clear sky Clear sky 77° 77° 0% — 1 mph 50%
11am Clear sky Clear sky 82° 82° 0% — 2 mph 44%
12pm Clear sky Clear sky 86° 85° 0% — 3 mph 38%
1pm Clear sky Clear sky 91° 89° 0% — 4 mph 33%
2pm Clear sky Clear sky 93° 91° 0% — 5 mph 31%
3pm Clear sky Clear sky 94° 92° 0% — 6 mph 30%
4pm Clear sky Clear sky 93° 91° 0% — 8 mph 30%
5pm Clear sky Clear sky 92° 90° 0% — 8 mph 32%
6pm Clear sky Clear sky 88° 87° 0% — 6 mph (gusts 13 mph) 35%
7pm Clear sky Clear sky 83° 82° 0% — 4 mph 40%
8pm Clear sky Clear sky 79° 79° 0% — 3 mph 45%
9pm Clear sky Clear sky 76° 76° 0% — 2 mph 47%
10pm Clear sky Clear sky 75° 75° 0% — 1 mph 49%
11pm Clear sky Clear sky 74° 74° 0% — 1 mph 50%
Sunday Oct 4
12am Clear sky Clear sky 72° 72° 0% — 1 mph 51%
1am Clear sky Clear sky 71° 71° 0% — 1 mph 51%
2am Partly cloudy Partly cloudy 71° 71° 0% — 1 mph 51%
3am Partly cloudy Partly cloudy 70° 70° 0% — 1 mph 51%
4am Partly cloudy Partly cloudy 70° 70° 0% — 1 mph 52%
5am Partly cloudy Partly cloudy 69° 69° 0% — 1 mph 52%
6am Partly cloudy Partly cloudy 69° 69° 0% — 1 mph 52%
7am Partly cloudy Partly cloudy 69° 69° 1% — 1 mph 52%
8am Partly cloudy Partly cloudy 71° 71° 1% — 1 mph 51%
9am Partly cloudy Partly cloudy 74° 74° 1% — 1 mph 48%
10am Partly cloudy Partly cloudy 79° 79° 1% — 1 mph 44%
11am Partly cloudy Partly cloudy 83° 82° 0% — 2 mph 39%
12pm Partly cloudy Partly cloudy 87° 85° 0% — 2 mph 35%
1pm Partly cloudy Partly cloudy 91° 88° 0% — 4 mph 31%
2pm Partly cloudy Partly cloudy 93° 90° 0% — 5 mph 29%
3pm Partly cloudy Partly cloudy 93° 91° 0% — 7 mph 29%
4pm Partly cloudy Partly cloudy 91° 88° 0% — 8 mph 30%
5pm Clear sky Clear sky 89° 87° 0% — 7 mph 33%
6pm Clear sky Clear sky 86° 85° 0% — 6 mph 37%
7pm Clear sky Clear sky 81° 81° 0% — 4 mph 42%
8pm Clear sky Clear sky 78° 78° 0% — 3 mph 47%
9pm Clear sky Clear sky 76° 76° 0% — 2 mph 50%
10pm Clear sky Clear sky 74° 74° 0% — 2 mph 52%
11pm Clear sky Clear sky 72° 72° 0% — 2 mph 54%
Monday Oct 5
12am Clear sky Clear sky 71° 71° 0% — 2 mph 55%
1am Clear sky Clear sky 71° 71° 0% — 2 mph 55%
2am Clear sky Clear sky 70° 70° 0% — 1 mph 55%

About this San Jose forecast

Updated 2026-10-03 10:58 UTC, and refreshed automatically every few minutes. Forecast data is provided by Visual Crossing; radar frames from RainViewer; the 20-year normals and records from the ERA5 reanalysis archive. No national weather service publishes point alerts here, so only computed watches are shown.

Watches labelled computed are worked out on this site from forecast thresholds and are not official warnings — always defer to your national weather service. Need help reading a number? See the sourced weather guide.

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