Coastal Flood Advisory
Ends in 4 days 23 h
When
Until 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 1.5 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 3:10 PM PDT at KSFO

San Carlos, CA weather

Sunny and 72°22°.

Mostly agree

Now 72°22°

Sunny

Wind: 5 mph8 km/h; From the north. Up to 7 mph11 km/h through 3 AM
Dew point: 43°6°; Comfortable
UV index: 3Moderate; Moderate until 4 PM · peak 5
Air quality: 31Good; Main pollutant: Ozone
Pressure: 29.99 inHg1016 hPa; Falling slowly · −0.04 inHg−1.3 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

6°3° warmer than this time yesterday (67°19° then, 73°23° now)

Good hours for

High 72°22° today at 4 PM
Below 60°16° tonight after 8 PM
Low 51°11° tomorrow at 6 AM
Above 60°16° tomorrow by 11 AM

This afternoonNear 71°22° · Clear
TonightDown to 52°11° by 3 AM · Clear
Tomorrow morningUp to 63°17° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 71°22° by 3 PM · Mostly cloudy
Tomorrow nightDown to 51°11° by 5 AM · Partly cloudy
Monday morningUp to 62°17° by 11 AM · Partly cloudy
Monday afternoonNear 65°18° · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 3p	Sunny	71°22° (likely 68°20° to 73°23°)	71°22°	0%	5 mph8 km/h from N, gusts 6 mph9 km/h	38%	0%	3
Sat 4p	Sunny	72°22° (likely 68°20° to 73°23°)	72°22°	0%	5 mph8 km/h from NNW, gusts 6 mph10 km/h	39%	0%	2
Sat 5p	Sunny	71°22° (likely 67°19° to 72°22°)	71°22°	0%	7 mph11 km/h from NW, gusts 7 mph11 km/h	41%	0%	2
Sat 6p	Clear	68°20° (likely 64°18° to 68°20°)	68°20°	0%	6 mph10 km/h from W, gusts 8 mph13 km/h	49%	0%	1
Sat 7p	Clear	64°18° (likely 60°16° to 64°18°)	64°18°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	58%	0%	0
Sat 8p	Clear	59°15° (likely 58°14° to 60°16°)	59°15°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	60%	0%	0
Sat 9p	Clear	58°14° (likely 57°14° to 58°14°)	58°14°	0%	1 mph2 km/h from WSW, gusts 4 mph7 km/h	64%	0%	0
Sat 10p	Clear	56°13° (likely 55°13° to 57°14°)	56°13°	0%	1 mph2 km/h from S, gusts 6 mph9 km/h	66%	0%	0
Sat 11p	Clear	55°13° (likely 54°12° to 57°14°)	55°13°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	69%	0%	0
Sun 12a	Clear	54°12° (likely 54°12° to 56°13°)	54°12°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	69%	8%	0
Sun 1a	Clear	54°12° (likely 53°12° to 55°13°)	54°12°	0%	1 mph2 km/h from S, gusts 3 mph5 km/h	68%	2%	0
Sun 2a	Clear	53°12° (likely 52°11° to 55°13°)	53°12°	0%	0 mph0 km/h, gusts 3 mph4 km/h	68%	0%	0
Sun 3a	Clear	52°11° (likely 51°11° to 55°13°)	52°11°	0%	0 mph0 km/h, gusts 2 mph4 km/h	69%	6%	0
Sun 4a	Mostly clear	52°11° (likely 50°10° to 54°12°)	52°11°	0%	0 mph0 km/h, gusts 3 mph4 km/h	69%	21%	0
Sun 5a	Partly cloudy	52°11° (likely 50°10° to 54°12°)	52°11°	0%	0 mph0 km/h, gusts 3 mph4 km/h	69%	53%	0
Sun 6a	Partly cloudy	51°11° (likely 49°9° to 54°12°)	51°11°	0%	0 mph0 km/h, gusts 3 mph4 km/h	70%	55%	0
Sun 7a	Cloudy	51°11° (likely 49°9° to 54°12°)	51°11°	0%	0 mph0 km/h, gusts 3 mph4 km/h	73%	58%	0
Sun 8a	Cloudy	51°11° (likely 49°9° to 54°12°)	51°11°	0%	0 mph0 km/h, gusts 2 mph3 km/h	75%	75%	0
Sun 9a	Cloudy	55°13° (likely 53°12° to 57°14°)	55°13°	0%	0 mph0 km/h, gusts 2 mph4 km/h	75%	79%	1
Sun 10a	Partly sunny	59°15° (likely 56°13° to 62°17°)	59°15°	0%	0 mph0 km/h, gusts 2 mph4 km/h	71%	76%	2
Sun 11a	Cloudy	63°17° (likely 59°15° to 66°19°)	63°17°	0%	1 mph2 km/h from NE, gusts 3 mph6 km/h	64%	74%	3
Sun 12p	Mostly cloudy	66°19° (likely 63°17° to 69°21°)	66°19°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	60%	67%	4
Sun 1p	Mostly cloudy	68°20° (likely 65°18° to 71°22°)	68°20°	0%	2 mph3 km/h from NNW, gusts 5 mph8 km/h	58%	71%	4
Sun 2p	Cloudy	70°21° (likely 66°19° to 71°22°)	70°21°	0%	3 mph5 km/h from WNW, gusts 7 mph12 km/h	54%	79%	4
Sun 3p	Cloudy	71°22° (likely 67°19° to 71°22°)	71°22°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	52%	78%	3
Sun 4p	Partly sunny	69°21° (likely 67°19° to 69°21°)	69°21°	0%	5 mph8 km/h from WSW, gusts 13 mph20 km/h	54%	80%	2
Sun 5p	Partly sunny	69°21° (likely 64°18° to 69°21°)	69°21°	0%	5 mph8 km/h from WSW, gusts 13 mph21 km/h	55%	81%	1
Sun 6p	Cloudy	66°19° (likely 61°16° to 66°19°)	66°19°	0%	3 mph5 km/h from W, gusts 14 mph22 km/h	62%	81%	0
Sun 7p	Partly cloudy	60°16° (likely 58°14° to 61°16°)	60°16°	0%	2 mph3 km/h from W, gusts 14 mph22 km/h	70%	85%	0
Sun 8p	Cloudy	58°14° (likely 57°14° to 58°14°)	58°14°	0%	2 mph3 km/h from W, gusts 12 mph20 km/h	72%	84%	0
Sun 9p	Partly cloudy	57°14° (likely 54°12° to 57°14°)	57°14°	0%	2 mph3 km/h from WSW, gusts 11 mph17 km/h	76%	38%	0
Sun 10p	Mostly clear	55°13° (likely 52°11° to 55°13°)	55°13°	0%	2 mph3 km/h from WSW, gusts 9 mph15 km/h	80%	23%	0
Sun 11p	Clear	54°12° (likely 51°11° to 55°13°)	54°12°	0%	2 mph3 km/h from WSW, gusts 8 mph13 km/h	83%	24%	0
Mon 12a	Clear	54°12° (likely 51°11° to 55°13°)	54°12°	0%	2 mph3 km/h from WSW, gusts 8 mph13 km/h	82%	27%	0
Mon 1a	Clear	53°12° (likely 50°10° to 55°13°)	53°12°	0%	2 mph3 km/h from WSW, gusts 8 mph13 km/h	82%	32%	0
Mon 2a	Mostly clear	52°11° (likely 49°9° to 55°13°)	53°12°	0%	2 mph3 km/h from WSW, gusts 9 mph15 km/h	83%	40%	0
Mon 3a	Mostly clear	52°11° (likely 49°9° to 55°13°)	52°11°	0%	2 mph3 km/h from WSW, gusts 9 mph15 km/h	85%	50%	0
Mon 4a	Mostly clear	52°11° (likely 49°9° to 55°13°)	52°11°	0%	2 mph3 km/h from WSW, gusts 8 mph13 km/h	85%	37%	0
Mon 5a	Partly cloudy	51°11° (likely 49°9° to 55°13°)	51°11°	0%	2 mph3 km/h from W, gusts 8 mph13 km/h	85%	26%	0
Mon 6a	Partly cloudy	52°11° (likely 50°10° to 54°12°)	52°11°	0%	2 mph3 km/h from W, gusts 8 mph13 km/h	86%	34%	0
Mon 7a	Partly sunny	52°11° (likely 50°10° to 54°12°)	52°11°	0%	2 mph3 km/h from W, gusts 9 mph14 km/h	88%	35%	0
Mon 8a	Partly sunny	52°11° (likely 51°11° to 55°13°)	52°11°	0%	2 mph3 km/h from W, gusts 9 mph14 km/h	90%	35%	0
Mon 9a	Partly sunny	55°13° (likely 55°13° to 57°14°)	55°13°	0%	2 mph3 km/h from W, gusts 8 mph12 km/h	89%	35%	1
Mon 10a	Cloudy	58°14° (likely 58°14° to 60°16°)	59°15°	0%	2 mph3 km/h from W, gusts 9 mph14 km/h	85%	59%	2
Mon 11a	Mostly sunny	62°17° (likely 61°16° to 63°17°)	62°17°	0%	5 mph8 km/h from WNW, gusts 9 mph14 km/h	80%	56%	3
Mon 12p	Mostly sunny	64°18° (likely 63°17° to 65°18°)	64°18°	0%	5 mph8 km/h from WNW, gusts 9 mph15 km/h	75%	25%	4
Mon 1p	Mostly sunny	65°18° (likely 65°18° to 67°19°)	65°18°	0%	5 mph8 km/h from WNW, gusts 11 mph17 km/h	70%	26%	5
Mon 2p	Partly sunny	66°19° (likely 65°18° to 66°19°)	66°19°	0%	10 mph16 km/h from WNW, gusts 13 mph21 km/h	67%	19%	5

Days ahead

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

Today, Oct 24. Sunny. High 72°22°, low 50°10°. Typical 71°22° / 52°11°. Dry. Mostly agree.
1. Afternoon
  noon–6 PM
  Sunny, 72°22°
  Dry
2. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Official NWS forecast
Today: Sunny, with a high near 72. North northwest wind around 7 mph.
Tonight: Mostly clear. Low around 50, with temperatures rising to around 52 overnight. Southwest wind 0 to 6 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
68°20°–73°23°
Low, likely
50°10°–54°12°
Typical high / low
71°22° / 52°11°
Wind
8 mph12 km/h
UV peak
5
Tomorrow, Oct 25. Cloudy. High 72°22°, low 50°10°. Typical 71°22° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 51°11°
  Dry
Official NWS forecast
Day: Partly sunny. High near 72, with temperatures falling to around 69 in the afternoon. 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
68°20°–72°22°
Low, likely
49°9°–53°12°
Typical high / low
71°22° / 52°11°
Wind
11 mph17 km/h, gusts 20 mph32 km/h
UV peak
4
Monday, Oct 26. Cloudy. High 67°19°, low 50°10°. Typical 70°21° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 67. West northwest wind 2 to 15 mph, with gusts as high as 22 mph.
Night: Mostly clear, with a low around 50.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–67°19°
Low, likely
50°10°–54°12°
Typical high / low
70°21° / 52°11°
Wind
12 mph19 km/h, gusts 24 mph38 km/h
UV peak
5
Tuesday, Oct 27. Mostly sunny. High 66°19°, low 50°10°. Typical 70°21° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 66.
Night: Partly cloudy, with a low around 50.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–66°19°
Low, likely
50°10°–54°12°
Typical high / low
70°21° / 52°11°
Wind
11 mph17 km/h, gusts 18 mph29 km/h
UV peak
5
Wednesday, Oct 28. Cloudy. High 64°18°, low 51°11°. Typical 70°21° / 52°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Mostly sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 64.
Night: Mostly cloudy, with a low around 51.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–64°18°
Low, likely
49°9°–54°12°
Typical high / low
70°21° / 52°11°
Wind
9 mph14 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 62°17°, low 49°9°. Typical 70°21° / 52°11°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 62.
Night: A slight chance of rain after 5am. Partly cloudy, with a low around 49.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
61°16°–66°19°
Low, likely
49°9°–56°13°
Typical high / low
70°21° / 52°11°
Wind
10 mph17 km/h, gusts 24 mph38 km/h
UV peak
4
Friday, Oct 30. Rain. High 62°17°, low 48°9°. Typical 69°21° / 51°11°. Rain 0.01 in0.3 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain. Mostly sunny, with a high near 62.
Night: A slight chance of rain. Partly cloudy, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–62°17°
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 61°16°, low 48°9°. Typical 69°21° / 51°11°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 51°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°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
58°14°–65°18°
Low, likely
44°7°–52°11°
Typical high / low
69°21° / 51°11°
Wind
8 mph14 km/h, gusts 22 mph35 km/h
UV peak
4
Sunday, Nov 1. Drizzle. High 63°17°, low 48°9°. Typical 69°21° / 51°11°. Rain 0.04 in1 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Rain, 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
60°16°–68°20°
Low, likely
41°5°–54°12°
Typical high / low
69°21° / 51°11°
Wind
9 mph14 km/h, gusts 22 mph35 km/h
UV peak
4
Monday, Nov 2. Cloudy. High 59°15°, low 50°10°. Typical 68°20° / 51°11°. Rain 0.21 in5.3 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 59°15°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°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
56°13°–61°16°
Low, likely
47°8°–54°12°
Typical high / low
68°20° / 51°11°
Wind
8 mph13 km/h, gusts 18 mph29 km/h

10 days15 days30 days

The outlook

Today
Dry, high 72°, low 50°.
Tomorrow
Dry, high 72°, low 50°.
Monday
Dry, high 67°, low 50°, cooling off.
Rest of week
Mostly dry, highs 59–66°.

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

6.8 mi

Below flood stage

Level: 0.3 ft
Flow: under 1 cfs

Forecast peak 0.2 ft Sat 4 PM

Reading from Sat 2:45 PM · NWS gauge page

Belmont Creek at Harbor Blvd at Old County Road

1.3 mi

Below flood stage

Level: 0.1 ft

Reading from Sat 4:16 AM · NWS gauge page

Atherton Channel upstream of Caltrain

4.8 mi

Level: 0.1 ft

Reading from Sat 6:12 AM · NWS gauge page

Lower Crystal Springs Reservoir at Dam

5.0 mi

Below flood stage

Level: 272 ft
Flow: 41,300 cfs

Reading from Sat 2:30 PM · NWS gauge page

For your home

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

Heating this week

About 49% less heating than a typical week.

This week 14Typical 28

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 43°F).

Open the windows?

Today, 4:00 PM–7:00 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 about typical for the date.

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

San Carlos 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 7:09–8:02 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–5 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

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

Looking south from San Carlos. The highest point on the skyline is about 3,400 ft, 31 mi away.Skyline from USGS elevation data, heights drawn up to 4× taller. Sky, sun and moon as they are now.

1 active weather alert

Coastal Flood Advisory

San Carlos, CA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

San Francisquito Creek at Stanford University

Belmont Creek at Harbor Blvd at Old County Road

Atherton Channel upstream of Caltrain

Lower Crystal Springs Reservoir at Dam

For your home

Heating this week

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon