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Official · NWS

Heat Advisory

until 5:00 am

Heat Advisory issued October 3 at 2:02AM PDT until October 4 at 10:00PM PDT by NWS San Francisco CA

Full text

* WHAT...Hot conditions with maximum temperatures in the low-80s to low-90s. Mild minimum temperatures and weak onshore flow will limit overnight relief. * WHERE...The Marin Hills, San Francisco, and Northern Salinas Valley/Hollister Valley and Carmel Valley. * WHEN...From 11 AM this morning to 10 PM PDT Sunday. * 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.

San Francisco; Marin Coastal Range; Northern Salinas Valley/Hollister Valley and Carmel Valley

San Francisco Hourly Weather

California 3:59 am local updated now

Partly cloudy

64°

Partly cloudy

Feels like 64°

84° 60° today's high / low

+12.7° vs normal — much warmer than normal

100

Perfect

Outdoor comfort right now

It is 64°F and partly cloudy in San Francisco. Nothing wet on the radar for the next 24 hours. Tomorrow: partly cloudy, high 81°F.

  • Pressure steady slowly 29.86 inHg
  • Wind 1 mph NW
  • Humidity 77%
  • Cloud 57%
  • UV peak 7
  • Rain chance 0%

Next 48 hours

Scroll sideways — or pick a day below.

Now

Partly cloudy

3

4am

Partly cloudy

2

5am

Partly cloudy

2

6am

Partly cloudy

3

7am

Partly cloudy

3

8am

Partly cloudy

3

9am

Partly cloudy

4

10am

Clear sky

4

11am

Clear sky

4

12pm

Clear sky

4

1pm

Clear sky

5

2pm

Clear sky

6

3pm

Clear sky

8

4pm

Clear sky

9

5pm

Clear sky

10

6pm

Clear sky

10

7pm

Clear sky

9

8pm

Clear sky

7

9pm

Clear sky

6

10pm

Clear sky

5

11pm

Clear sky

5

12am

Sun

Clear sky

5

1am

Clear sky

4

2am

Partly cloudy

3

3am

Partly cloudy

3

4am

Partly cloudy

2

5am

Partly cloudy

2

6am

Partly cloudy

1%

3

7am

Partly cloudy

1%

3

8am

Partly cloudy

1%

3

9am

Partly cloudy

1%

3

10am

Partly cloudy

1%

3

11am

Partly cloudy

4

12pm

Partly cloudy

5

1pm

Partly cloudy

7

2pm

Partly cloudy

10

3pm

Partly cloudy

11

4pm

Partly cloudy

12

5pm

Clear sky

12

6pm

Clear sky

11

7pm

Clear sky

9

8pm

Clear sky

8

9pm

Clear sky

8

10pm

Clear sky

7

11pm

Clear sky

7

12am

Mon

Clear sky

6

1am

Clear sky

6

2am

Clear sky

5

Conditions in detail

  • Feels like

    64°

    About what it looks like

  • Dew point

    56°

    Comfortable

  • Wind

    1 mph

    Gusting 2 mph from NW

  • Pressure

    29.88 inHg

    Steady slowly

  • Visibility

    9.9 mi

    Clear

  • UV index

    0

    Peaks at 7 today

  • Cloud cover

    57%

    —

  • Precipitation today

    0.00"

    None expected

Air quality

US AQI

57

Moderate

  • PM2.5 15 µg/m³
  • PM10 19 µg/m³
  • Ozone 39 µg/m³
  • NO₂ 26 µg/m³

Hour-by-hour forecast for San Francisco

Every hour for the next 48 hours, local time.

Time Conditions Temp Feels Chance Amount Wind Humidity
Saturday Oct 3
3am Partly cloudy Partly cloudy 62° 62° 0% — 3 mph 80%
4am Partly cloudy Partly cloudy 60° 60° 0% — 2 mph 87%
5am Partly cloudy Partly cloudy 60° 60° 0% — 2 mph 88%
6am Partly cloudy Partly cloudy 60° 60° 0% — 3 mph 88%
7am Partly cloudy Partly cloudy 60° 60° 0% — 3 mph 87%
8am Partly cloudy Partly cloudy 62° 62° 0% — 3 mph 85%
9am Partly cloudy Partly cloudy 64° 64° 0% — 4 mph 81%
10am Clear sky Clear sky 69° 69° 0% — 4 mph 74%
11am Clear sky Clear sky 73° 73° 0% — 4 mph 65%
12pm Clear sky Clear sky 78° 78° 0% — 4 mph 58%
1pm Clear sky Clear sky 82° 81° 0% — 5 mph 52%
2pm Clear sky Clear sky 84° 83° 0% — 6 mph 49%
3pm Clear sky Clear sky 84° 83° 0% — 8 mph 49%
4pm Clear sky Clear sky 82° 81° 0% — 9 mph 51%
5pm Clear sky Clear sky 80° 80° 0% — 10 mph 53%
6pm Clear sky Clear sky 76° 76° 0% — 10 mph 56%
7pm Clear sky Clear sky 73° 73° 0% — 9 mph 59%
8pm Clear sky Clear sky 72° 72° 0% — 7 mph 61%
9pm Clear sky Clear sky 70° 70° 0% — 6 mph 62%
10pm Clear sky Clear sky 70° 70° 0% — 5 mph 64%
11pm Clear sky Clear sky 69° 69° 0% — 5 mph 65%
Sunday Oct 4
12am Clear sky Clear sky 68° 68° 0% — 5 mph 67%
1am Clear sky Clear sky 66° 66° 0% — 4 mph 70%
2am Partly cloudy Partly cloudy 65° 65° 0% — 3 mph 72%
3am Partly cloudy Partly cloudy 65° 65° 0% — 3 mph 75%
4am Partly cloudy Partly cloudy 64° 64° 0% — 2 mph 76%
5am Partly cloudy Partly cloudy 64° 64° 0% — 2 mph 75%
6am Partly cloudy Partly cloudy 64° 64° 1% — 3 mph 75%
7am Partly cloudy Partly cloudy 64° 64° 1% — 3 mph 74%
8am Partly cloudy Partly cloudy 65° 65° 1% — 3 mph 73%
9am Partly cloudy Partly cloudy 68° 68° 1% — 3 mph 69%
10am Partly cloudy Partly cloudy 72° 72° 1% — 3 mph 64%
11am Partly cloudy Partly cloudy 75° 75° 0% — 4 mph 59%
12pm Partly cloudy Partly cloudy 78° 78° 0% — 5 mph 55%
1pm Partly cloudy Partly cloudy 81° 81° 0% — 7 mph 53%
2pm Partly cloudy Partly cloudy 79° 79° 0% — 10 mph 54%
3pm Partly cloudy Partly cloudy 76° 76° 0% — 11 mph 57%
4pm Partly cloudy Partly cloudy 74° 74° 0% — 12 mph 58%
5pm Clear sky Clear sky 72° 72° 0% — 12 mph 60%
6pm Clear sky Clear sky 70° 70° 0% — 11 mph 63%
7pm Clear sky Clear sky 68° 68° 0% — 9 mph 67%
8pm Clear sky Clear sky 66° 66° 0% — 8 mph 71%
9pm Clear sky Clear sky 65° 65° 0% — 8 mph 73%
10pm Clear sky Clear sky 65° 65° 0% — 7 mph 75%
11pm Clear sky Clear sky 64° 64° 0% — 7 mph 77%
Monday Oct 5
12am Clear sky Clear sky 64° 64° 0% — 6 mph 79%
1am Clear sky Clear sky 63° 63° 0% — 6 mph 80%
2am Clear sky Clear sky 63° 63° 0% — 5 mph 82%

About this San Francisco forecast

Updated 2026-10-03 10:59 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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