Coastal Flood Advisory
Ends in 5 days 4 h
When
From 8 AM Saturday to 3 PM PDT Thursday.
Where
Bay Shoreline locations of San Francisco Bay, Monterey Bay and Big Sur Coast.
Issued for this forecast zone · National Weather Service San Francisco CA
What, impacts and precautionsHide details
What
Up to 1.9ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways.
Impacts
High tides will result in flooding of low-lying infrastructure, isolated road closures, and coastal erosion. Rising tides will bring water and waves farther up the beach than normal, restricting escape from beaches and coastal areas.
Additional details
At the San Francisco tidal gauge, high tide is expected to be 1.1 ft above normal (6.9 ft MLLW) at 10:39 AM Saturday 10/24, 1.5 ft above normal (7.3 ft MLLW) at 11:07 AM Sunday 10/25, 1.6 ft above normal (7.4 ft MLLW) at 11:39 AM Monday 10/26, 1.8 ft above normal (7.6 ft MLLW) at 12:15 PM Tuesday 10/27, 1.9 ft above normal (7.7 ft MLLW) at 12:56 PM Wednesday 10/28, and 1.7 ft above normal (7.5 ft MLLW) at 01:43 PM Thursday 10/29. These predictions include up to 1.0 ft of surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.
Precautionary actions
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Areas: San Francisco; North Bay Interior Valleys; San Francisco Bay Shoreline; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast
See it on weather.gov (opens in a new tab)

Observed 9:47 AM PDT at KPAO

Atherton, CA weather

Sunny and 61°16°.

Mostly agree

Now 61°16°

Sunny

Wind: Calm; Up to 5 mph8 km/h through 10 PM
Dew point: 46°8°; Comfortable
UV index: 1Low; Moderate 11 AM–4 PM · peak 4
Air quality: 23Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.08 inHg1019 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

High 73°23° today at 4 PM
Below 60°16° tonight after 9 PM
Low 50°10° tomorrow at 6 AM
Above 60°16° tomorrow by 10 AM

This morningNear 62°17° · Clear
This afternoonUp to 73°23° by 4 PM · Clear
TonightDown to 51°11° by 5 AM · Clear
Tomorrow morningUp to 65°18° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 74°23° by 3 PM · Mostly cloudy
Tomorrow nightDown to 51°11° by 5 AM · Partly cloudy
Monday morningUp to 55°13° by 9 AM · Mostly cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 10a	Sunny	60°16° (likely 58°14° to 61°16°)	60°16°	0%	3 mph5 km/h from ENE, gusts 4 mph7 km/h	54%	0%	1
Sat 11a	Sunny	63°17° (likely 61°16° to 65°18°)	63°17°	0%	5 mph8 km/h from NE, gusts 4 mph7 km/h	48%	0%	3
Sat 12p	Sunny	67°19° (likely 63°17° to 68°20°)	67°19°	0%	5 mph8 km/h from N, gusts 6 mph9 km/h	46%	0%	4
Sat 1p	Sunny	69°21° (likely 65°18° to 70°21°)	69°21°	0%	5 mph8 km/h from N, gusts 5 mph7 km/h	43%	0%	4
Sat 2p	Sunny	71°22° (likely 66°19° to 72°22°)	71°22°	0%	5 mph8 km/h from N, gusts 5 mph7 km/h	40%	0%	4
Sat 3p	Sunny	72°22° (likely 68°20° to 73°23°)	73°23°	0%	5 mph8 km/h from N, gusts 5 mph9 km/h	40%	0%	3
Sat 4p	Sunny	73°23° (likely 68°20° to 73°23°)	73°23°	0%	5 mph8 km/h from NNW, gusts 6 mph10 km/h	40%	0%	2
Sat 5p	Sunny	72°22° (likely 67°19° to 72°22°)	72°22°	0%	5 mph8 km/h from NNW, gusts 7 mph11 km/h	40%	0%	2
Sat 6p	Clear	70°21° (likely 64°18° to 70°21°)	70°21°	0%	3 mph5 km/h from NNW, gusts 7 mph11 km/h	46%	0%	1
Sat 7p	Clear	64°18° (likely 60°16° to 64°18°)	64°18°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	53%	0%	0
Sat 8p	Clear	61°16° (likely 57°14° to 61°16°)	61°16°	0%	1 mph2 km/h from WSW, gusts 5 mph7 km/h	59%	0%	0
Sat 9p	Clear	59°15° (likely 55°13° to 59°15°)	59°15°	0%	1 mph2 km/h from W, gusts 4 mph6 km/h	64%	0%	0
Sat 10p	Clear	58°14° (likely 53°12° to 58°14°)	58°14°	0%	1 mph2 km/h from S, gusts 5 mph7 km/h	64%	0%	0
Sat 11p	Clear	56°13° (likely 52°11° to 57°14°)	56°13°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	67%	1%	0
Sun 12a	Clear	56°13° (likely 52°11° to 56°13°)	56°13°	0%	1 mph2 km/h from SSE, gusts 5 mph7 km/h	67%	0%	0
Sun 1a	Clear	55°13° (likely 52°11° to 56°13°)	55°13°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	68%	1%	0
Sun 2a	Clear	54°12° (likely 51°11° to 55°13°)	54°12°	0%	1 mph2 km/h from S, gusts 3 mph4 km/h	68%	0%	0
Sun 3a	Clear	52°11° (likely 50°10° to 55°13°)	52°11°	0%	0 mph0 km/h, gusts 3 mph4 km/h	70%	41%	0
Sun 4a	Partly cloudy	52°11° (likely 49°9° to 55°13°)	52°11°	0%	0 mph0 km/h, gusts 3 mph4 km/h	72%	52%	0
Sun 5a	Partly cloudy	51°11° (likely 49°9° to 55°13°)	51°11°	0%	0 mph0 km/h, gusts 3 mph5 km/h	72%	52%	0
Sun 6a	Partly cloudy	50°10° (likely 49°9° to 54°12°)	50°10°	0%	0 mph0 km/h, gusts 3 mph5 km/h	73%	59%	0
Sun 7a	Partly sunny	50°10° (likely 48°9° to 53°12°)	51°11°	0%	0 mph0 km/h, gusts 3 mph5 km/h	74%	61%	0
Sun 8a	Mostly cloudy	51°11° (likely 48°9° to 54°12°)	51°11°	0%	1 mph2 km/h from ESE, gusts 2 mph4 km/h	74%	69%	0
Sun 9a	Mostly cloudy	56°13° (likely 52°11° to 56°13°)	56°13°	0%	1 mph2 km/h from ESE, gusts 2 mph3 km/h	70%	72%	1
Sun 10a	Cloudy	61°16° (likely 57°14° to 61°16°)	61°16°	0%	1 mph2 km/h from ESE, gusts 2 mph4 km/h	64%	78%	2
Sun 11a	Cloudy	65°18° (likely 60°16° to 65°18°)	65°18°	0%	2 mph3 km/h from N, gusts 3 mph5 km/h	59%	81%	3
Sun 12p	Partly sunny	69°21° (likely 63°17° to 69°21°)	69°21°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	58%	73%	4
Sun 1p	Partly sunny	71°22° (likely 65°18° to 71°22°)	71°22°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	55%	75%	4
Sun 2p	Cloudy	72°22° (likely 66°19° to 72°22°)	72°22°	0%	5 mph8 km/h from NW, gusts 7 mph11 km/h	51%	83%	4
Sun 3p	Cloudy	74°23° (likely 67°19° to 74°23°)	74°23°	0%	5 mph8 km/h from NW, gusts 8 mph12 km/h	50%	81%	3
Sun 4p	Partly sunny	73°23° (likely 67°19° to 73°23°)	73°23°	0%	5 mph8 km/h from NW, gusts 8 mph14 km/h	50%	80%	2
Sun 5p	Partly sunny	72°22° (likely 65°18° to 72°22°)	72°22°	0%	3 mph5 km/h from WNW, gusts 11 mph18 km/h	50%	79%	1
Sun 6p	Partly cloudy	69°21° (likely 62°17° to 69°21°)	69°21°	0%	3 mph5 km/h from WNW, gusts 11 mph18 km/h	57%	81%	0
Sun 7p	Cloudy	65°18° (likely 59°15° to 65°18°)	65°18°	0%	3 mph5 km/h from WNW, gusts 9 mph14 km/h	65%	78%	0
Sun 8p	Cloudy	60°16° (likely 56°13° to 60°16°)	61°16°	0%	1 mph2 km/h from W, gusts 6 mph10 km/h	72%	78%	0
Sun 9p	Cloudy	58°14° (likely 53°12° to 58°14°)	58°14°	0%	1 mph2 km/h from W, gusts 6 mph10 km/h	76%	75%	0
Sun 10p	Mostly clear	57°14° (likely 52°11° to 57°14°)	57°14°	0%	1 mph2 km/h from W, gusts 6 mph9 km/h	79%	38%	0
Sun 11p	Mostly clear	56°13° (likely 51°11° to 57°14°)	56°13°	0%	2 mph3 km/h from WSW, gusts 6 mph10 km/h	80%	23%	0
Mon 12a	Mostly clear	55°13° (likely 50°10° to 57°14°)	55°13°	0%	2 mph3 km/h from WSW, gusts 6 mph9 km/h	83%	35%	0
Mon 1a	Clear	54°12° (likely 50°10° to 56°13°)	54°12°	0%	2 mph3 km/h from WSW, gusts 6 mph9 km/h	85%	29%	0
Mon 2a	Partly cloudy	53°12° (likely 50°10° to 56°13°)	53°12°	0%	2 mph3 km/h from SW, gusts 5 mph8 km/h	86%	30%	0
Mon 3a	Partly cloudy	52°11° (likely 49°9° to 56°13°)	53°12°	0%	2 mph3 km/h from SW, gusts 6 mph9 km/h	88%	35%	0
Mon 4a	Partly cloudy	52°11° (likely 50°10° to 55°13°)	52°11°	0%	2 mph3 km/h from SW, gusts 6 mph10 km/h	89%	50%	0
Mon 5a	Partly cloudy	51°11° (likely 49°9° to 54°12°)	51°11°	0%	2 mph3 km/h from SW, gusts 5 mph9 km/h	90%	55%	0
Mon 6a	Partly cloudy	50°10° (likely 50°10° to 55°13°)	50°10°	0%	2 mph3 km/h from SW, gusts 5 mph8 km/h	93%	67%	0
Mon 7a	Cloudy	50°10° (likely 50°10° to 55°13°)	50°10°	0%	2 mph3 km/h from SW, gusts 6 mph9 km/h	94%	75%	0
Mon 8a	Partly sunny	51°11° (likely 50°10° to 54°12°)	51°11°	0%	2 mph3 km/h from WSW, gusts 5 mph8 km/h	93%	58%	0
Mon 9a	Partly sunny	55°13° (likely 53°12° to 57°14°)	55°13°	0%	2 mph3 km/h from WSW, gusts 5 mph9 km/h	88%	55%	1

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Sunny. High 73°23°, low 50°10°. Typical 71°22° / 52°11°. Dry. Mostly agree. Best day outdoors this week.
1. Morning
  6 AM–noon
  Sunny, 63°17°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°11°
  Dry
Official NWS forecast
Today: Sunny, with a high near 73. North wind around 5 mph.
Tonight: Mostly clear, with a low around 50. Southwest wind 0 to 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Best day outdoors this week: the one dry, mild day the forecasts agree on (high 73°23°).
High, likely
68°20°–73°23°
Low, likely
48°9°–55°13°
Typical high / low
71°22° / 52°11°
Wind
6 mph10 km/h, gusts 12 mph19 km/h
UV peak
5
Tomorrow, Oct 25. Cloudy. High 75°24°, low 50°10°. Typical 71°22° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly cloudy, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 51°11°
  Dry
Official NWS forecast
Day: Mostly sunny. High near 75, with temperatures falling to around 72 in the afternoon. West northwest wind 0 to 5 mph.
Night: Partly cloudy, with a low around 50. West southwest wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–75°24°
Low, likely
48°9°–54°12°
Typical high / low
71°22° / 52°11°
Wind
8 mph13 km/h, gusts 15 mph24 km/h
UV peak
4
Monday, Oct 26. Cloudy. High 70°21°, low 49°9°. Typical 70°21° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog between 7am and 8am. Mostly sunny, with a high near 70. West wind 2 to 12 mph.
Night: Mostly clear, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–70°21°
Low, likely
49°9°–54°12°
Typical high / low
70°21° / 52°11°
Wind
10 mph16 km/h, gusts 23 mph36 km/h
UV peak
5
Tuesday, Oct 27. Cloudy. High 69°21°, low 49°9°. Typical 70°21° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog before 9am. Mostly sunny, with a high near 69.
Night: Partly cloudy, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–69°21°
Low, likely
48°9°–54°12°
Typical high / low
70°21° / 52°11°
Wind
9 mph14 km/h, gusts 17 mph27 km/h
UV peak
5
Wednesday, Oct 28. Cloudy. High 69°21°, low 50°10°. Typical 70°21° / 52°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Mostly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 54°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 69.
Night: Mostly cloudy, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–69°21°
Low, likely
48°9°–51°11°
Typical high / low
70°21° / 52°11°
Wind
8 mph12 km/h, gusts 13 mph21 km/h
UV peak
4
Thursday, Oct 29. Rain. High 67°19°, low 50°10°. Typical 70°21° / 52°11°. Rain, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog between 7am and 8am, then a slight chance of rain. Partly sunny, with a high near 67.
Night: A chance of rain. Partly cloudy, with a low around 50.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
61°16°–68°20°
Low, likely
49°9°–55°13°
Typical high / low
70°21° / 52°11°
Wind
11 mph17 km/h, gusts 24 mph38 km/h
UV peak
4
Friday, Oct 30. Rain. High 67°19°, low 50°10°. Typical 69°21° / 51°11°. Rain 0.01 in0.3 mm, 40% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 49°9°
  20% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain. Partly sunny, with a high near 67.
Night: A chance of rain. Mostly cloudy, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–67°19°
Low, likely
48°9°–52°11°
Typical high / low
69°21° / 51°11°
Wind
12 mph19 km/h, gusts 23 mph36 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 62°17°, low 47°8°. Typical 69°21° / 51°11°. Rain 0.03 in0.8 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 49°10°
  20% chance
2. Afternoon
  noon–6 PM
  Sunny, 62°16°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–66°19°
Low, likely
44°7°–50°10°
Typical high / low
69°21° / 51°11°
Wind
8 mph12 km/h, gusts 20 mph31 km/h
UV peak
4
Sunday, Nov 1. Sunny. High 64°18°, low 47°8°. Typical 69°21° / 51°11°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 50°10°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
59°15°–70°21°
Low, likely
43°6°–50°10°
Typical high / low
69°21° / 51°11°
Wind
13 mph20 km/h, gusts 30 mph48 km/h
UV peak
4
Monday, Nov 2. Rain. High 62°17°, low 51°11°. Typical 68°20° / 51°11°. Rain 0.25 in6.4 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–64°18°
Low, likely
50°10°–52°11°
Typical high / low
68°20° / 51°11°
Wind
8 mph12 km/h, gusts 26 mph42 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 73°, low 50°.
Tomorrow
Dry, high 75°, low 50°.
Monday
Dry, high 70°, low 49°, cooling off.
Rest of week
Mostly dry, highs 62–69°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (MTR) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

San Francisquito Creek at Stanford University

2.4 mi

Below flood stage

Level: 0.3 ft
Flow: under 1 cfs

Forecast peak 0.2 ft Sat 10 AM

Reading from Sat 9:15 AM · NWS gauge page

Atherton Channel upstream of Caltrain

0.5 mi

Level: 0.1 ft

Reading from Sat 6:12 AM · NWS gauge page

Atherton Channel at Las Lomitas School

1.5 mi

Level: 0.1 ft

Reading from Sat 9 AM · NWS gauge page

San Francisquito Creek at Waverly (SFWS)

1.9 mi

Below flood stage

Level: 0.0 ft

Reading from Sat 9:05 AM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 54% less heating than a typical week.

This week 13Typical 28

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 46°F).

Open the windows?

Today, 11:00 AM–8:00 PM

Good stretch to open the windows.

Is this typical?

San Francisco International Airport · official normals 1991–2020 · records 1945–2026

Oct 24, today vs a typical year

Today’s expected high is 2°1° warmer than typical.

Last 7 days vs normal

On average 1°0° colder than normal (daily mean temperature).

−1°SunOct 18
−2°−1°MonOct 19
−1°TueOct 20
±0°WedOct 21
−1°ThuOct 22
+1°FriOct 23
—SatOct 24

Atherton weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 54 min; Losing 2 min 16 s a day; shortest Dec 21, 1 h 19 min less
Golden hour: 5:43–6:36 PM; Morning 7:09–8:01 AM
Blue hour: 6:36–6:46 PM; Morning 6:59–7:09 AM; first light 6:59 AM

Stars tonight? Fair

Mostly clear 6:46 PM–3 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

Today: sets 5:47 AM · rises 5:19 PM
Full moon: Oct 25
New moon: Nov 8

Looking southwest from Atherton. The highest point on the skyline is about 2,800 ft, 10 mi away.Skyline from USGS elevation data, heights drawn up to 5.5× taller. Sky, sun and moon as they are now.

1 active weather alert

Coastal Flood Advisory