Coastal Flood Advisory
Starts in 2 h 46 min
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, 1.4 ft above normal (7.2 ft MLLW) at 11:07 AM Sunday 10/25, 1.7 ft above normal (7.5 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)

Model estimate for 5:00 AM PDT (no recent station report)

Piedmont, CA weather

Clear and 50°10°.

Mostly agree

Now 50°10°

Clear

Wind: Calm; Up to 5 mph8 km/h through 5 PM
Dew point: 36°2°; Comfortable · up to 45°7° by 1 PM
UV index: 0Low; Moderate 11 AM–5 PM · peak 5
Air today: 55Moderate; EPA forecast · PM2.5 (fine particles)

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Above 60°16° today by noon
High 68°20° today at 3 PM
Below 60°16° tonight after 7 PM

This morningUp to 59°15° by 11 AM · Clear
This afternoonUp to 68°20° by 3 PM · Clear
TonightDown to 51°11° by 3 AM · Clear
Tomorrow morningUp to 58°14° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 68°20° by 3 PM · Mostly cloudy
Tomorrow nightDown to 52°11° by 3 AM · Partly 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 5a	Clear	50°10° (likely 50°10° to 55°13°)	50°10°	0%	1 mph2 km/h from ENE, gusts 5 mph8 km/h	60%	0%	0
Sat 6a	Clear	50°10° (likely 49°9° to 56°13°)	50°10°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	61%	3%	0
Sat 7a	Sunny	50°10° (likely 48°9° to 55°13°)	50°10°	0%	2 mph3 km/h from E, gusts 2 mph3 km/h	61%	8%	0
Sat 8a	Sunny	50°10° (likely 48°9° to 55°13°)	50°10°	0%	2 mph3 km/h from ENE, gusts 2 mph3 km/h	62%	10%	0
Sat 9a	Sunny	52°11° (likely 52°11° to 57°14°)	52°11°	0%	2 mph3 km/h from ENE, gusts 3 mph4 km/h	64%	9%	1
Sat 10a	Sunny	55°13° (likely 55°13° to 60°16°)	55°13°	0%	3 mph5 km/h from ENE, gusts 2 mph4 km/h	60%	6%	2
Sat 11a	Sunny	59°15° (likely 59°15° to 64°18°)	59°15°	0%	5 mph8 km/h from NE, gusts 8 mph13 km/h	54%	4%	3
Sat 12p	Sunny	63°17° (likely 63°17° to 66°19°)	63°17°	0%	5 mph8 km/h from NNE, gusts 7 mph12 km/h	49%	2%	4
Sat 1p	Sunny	65°18° (likely 65°18° to 68°20°)	65°18°	0%	5 mph8 km/h from NNE, gusts 7 mph12 km/h	48%	1%	5
Sat 2p	Sunny	67°19° (likely 67°19° to 70°21°)	67°19°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	48%	0%	5
Sat 3p	Sunny	68°20° (likely 68°20° to 71°22°)	68°20°	0%	3 mph5 km/h from NW, gusts 6 mph10 km/h	47%	0%	4
Sat 4p	Sunny	68°20° (likely 67°19° to 70°21°)	68°20°	0%	3 mph5 km/h from WNW, gusts 6 mph10 km/h	47%	0%	3
Sat 5p	Sunny	67°19° (likely 65°18° to 69°21°)	67°19°	0%	2 mph3 km/h from WNW, gusts 7 mph11 km/h	49%	0%	2
Sat 6p	Clear	64°18° (likely 61°16° to 65°18°)	64°18°	0%	1 mph2 km/h from NW, gusts 8 mph12 km/h	58%	0%	1
Sat 7p	Clear	59°15° (likely 58°14° to 61°16°)	59°15°	0%	0 mph0 km/h, gusts 6 mph9 km/h	66%	0%	0
Sat 8p	Clear	57°14° (likely 55°13° to 59°15°)	57°14°	0%	0 mph0 km/h, gusts 5 mph8 km/h	71%	0%	0
Sat 9p	Clear	56°13° (likely 53°12° to 58°14°)	56°13°	0%	0 mph0 km/h, gusts 5 mph8 km/h	72%	0%	0
Sat 10p	Clear	54°12° (likely 52°11° to 57°14°)	54°12°	0%	0 mph0 km/h, gusts 4 mph7 km/h	73%	0%	0
Sat 11p	Clear	53°12° (likely 51°11° to 57°14°)	53°12°	0%	0 mph0 km/h, gusts 3 mph5 km/h	75%	5%	0
Sun 12a	Clear	53°12° (likely 50°10° to 56°13°)	53°12°	0%	0 mph0 km/h, gusts 3 mph5 km/h	76%	9%	0
Sun 1a	Clear	52°11° (likely 49°9° to 56°13°)	52°11°	0%	0 mph0 km/h, gusts 3 mph5 km/h	75%	16%	0
Sun 2a	Clear	52°11° (likely 49°9° to 55°13°)	52°11°	0%	0 mph0 km/h, gusts 3 mph5 km/h	75%	16%	0
Sun 3a	Mostly clear	51°11° (likely 48°9° to 54°12°)	51°11°	0%	0 mph0 km/h, gusts 3 mph5 km/h	76%	45%	0
Sun 4a	Mostly clear	51°11° (likely 48°9° to 54°12°)	51°11°	0%	0 mph0 km/h, gusts 3 mph4 km/h	75%	54%	0
Sun 5a	Partly cloudy	51°11° (likely 47°8° to 54°12°)	51°11°	0%	1 mph2 km/h from E, gusts 2 mph4 km/h	74%	57%	0
Sun 6a	Partly cloudy	50°10° (likely 47°8° to 54°12°)	50°10°	0%	1 mph2 km/h from E, gusts 3 mph4 km/h	76%	61%	0
Sun 7a	Partly sunny	50°10° (likely 47°8° to 53°12°)	50°10°	0%	1 mph2 km/h from E, gusts 3 mph6 km/h	76%	74%	0
Sun 8a	Partly sunny	50°10° (likely 48°9° to 53°12°)	50°10°	0%	1 mph2 km/h from ENE, gusts 4 mph6 km/h	76%	77%	0
Sun 9a	Partly sunny	52°11° (likely 51°11° to 55°13°)	52°11°	0%	1 mph2 km/h from ENE, gusts 3 mph5 km/h	76%	80%	1
Sun 10a	Partly sunny	55°13° (likely 53°12° to 58°14°)	55°13°	0%	1 mph2 km/h from ENE, gusts 5 mph7 km/h	79%	70%	2
Sun 11a	Cloudy	58°14° (likely 57°14° to 62°17°)	58°14°	0%	2 mph3 km/h from NW, gusts 5 mph9 km/h	72%	68%	3
Sun 12p	Cloudy	62°17° (likely 60°16° to 66°19°)	63°17°	0%	2 mph3 km/h from NW, gusts 6 mph9 km/h	67%	63%	4
Sun 1p	Cloudy	65°18° (likely 62°17° to 68°20°)	65°18°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	65%	80%	4
Sun 2p	Cloudy	66°19° (likely 61°16° to 70°21°)	66°19°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	62%	82%	4
Sun 3p	Cloudy	68°20° (likely 60°16° to 70°21°)	68°20°	0%	3 mph5 km/h from W, gusts 9 mph15 km/h	60%	80%	4
Sun 4p	Cloudy	67°19° (likely 59°15° to 69°21°)	67°19°	0%	3 mph5 km/h from W, gusts 11 mph18 km/h	60%	81%	3
Sun 5p	Cloudy	66°19° (likely 57°14° to 66°19°)	66°19°	0%	2 mph3 km/h from W, gusts 11 mph18 km/h	60%	85%	1
Sun 6p	Cloudy	63°17° (likely 55°13° to 63°17°)	63°17°	0%	2 mph3 km/h from W, gusts 11 mph17 km/h	68%	85%	0
Sun 7p	Cloudy	60°16° (likely 54°12° to 60°16°)	60°16°	0%	2 mph3 km/h from W, gusts 10 mph17 km/h	74%	85%	0
Sun 8p	Cloudy	56°13° (likely 54°12° to 58°14°)	56°13°	0%	0 mph0 km/h, gusts 9 mph15 km/h	79%	74%	0
Sun 9p	Partly cloudy	54°12° (likely 53°12° to 57°14°)	55°13°	0%	0 mph0 km/h, gusts 9 mph14 km/h	82%	63%	0
Sun 10p	Partly cloudy	54°12° (likely 52°11° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 9 mph14 km/h	83%	54%	0
Sun 11p	Partly cloudy	54°12° (likely 51°11° to 56°13°)	54°12°	0%	1 mph2 km/h from WSW, gusts 8 mph13 km/h	84%	55%	0
Mon 12a	Partly cloudy	53°12° (likely 50°10° to 56°13°)	53°12°	0%	1 mph2 km/h from WSW, gusts 5 mph8 km/h	84%	20%	0
Mon 1a	Partly cloudy	53°12° (likely 50°10° to 56°13°)	53°12°	0%	1 mph2 km/h from WSW, gusts 5 mph7 km/h	85%	20%	0
Mon 2a	Mostly cloudy	53°12° (likely 50°10° to 56°13°)	53°12°	0%	1 mph2 km/h from SW, gusts 5 mph7 km/h	86%	37%	0
Mon 3a	Mostly cloudy	52°11° (likely 52°11° to 56°13°)	53°12°	0%	1 mph2 km/h from SW, gusts 5 mph9 km/h	86%	45%	0
Mon 4a	Mostly cloudy	52°11° (likely 52°11° to 56°13°)	52°11°	0%	1 mph2 km/h from SW, gusts 6 mph10 km/h	86%	34%	0

Days ahead

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

Today, Oct 24. Sunny. High 69°21°, low 49°9°. Typical 69°21° / 54°12°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 51°11°
  Dry
Official NWS forecast
Today: Sunny. High near 69, with temperatures falling to around 67 in the afternoon. North northeast wind 1 to 5 mph.
Tonight: Clear, with a low around 49. East northeast wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
68°20°–71°22°
Low, likely
48°9°–54°12°
Typical high / low
69°21° / 54°12°
Wind
9 mph15 km/h
UV peak
5
Tomorrow, Oct 25. Partly sunny. High 68°20°, low 51°11°. Typical 69°21° / 54°12°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Mostly cloudy, 52°11°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 68. Northwest wind around 3 mph.
Night: Partly cloudy, with a low around 51. Southwest wind around 2 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–70°21°
Low, likely
46°8°–53°12°
Typical high / low
69°21° / 54°12°
Wind
9 mph14 km/h, gusts 15 mph25 km/h
UV peak
4
Monday, Oct 26. Partly sunny. High 63°17°, low 49°9°. Typical 69°21° / 54°12°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 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: Mostly sunny, with a high near 63.
Night: Partly cloudy, with a low around 49.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–66°19°
Low, likely
49°9°–54°12°
Typical high / low
69°21° / 54°12°
Wind
11 mph18 km/h, gusts 19 mph30 km/h
UV peak
5
Tuesday, Oct 27. Partly sunny. High 63°17°, low 49°9°. Typical 69°21° / 53°12°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 63.
Night: Partly cloudy, with a low around 49.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–65°18°
Low, likely
46°8°–53°12°
Typical high / low
69°21° / 53°12°
Wind
9 mph14 km/h, gusts 14 mph23 km/h
UV peak
5
Wednesday, Oct 28. Cloudy. High 64°18°, low 51°11°. Typical 68°20° / 53°12°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 51°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–64°18°
Low, likely
47°8°–53°12°
Typical high / low
68°20° / 53°12°
Wind
7 mph11 km/h, gusts 14 mph22 km/h
UV peak
4
Thursday, Oct 29. Rain. High 62°17°, low 51°11°. Typical 68°20° / 53°12°. Rain, 20% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  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 between 10am and 11am, then a slight chance of rain. Partly sunny, with a high near 62.
Night: A chance of rain. Mostly cloudy, with a low around 51.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
61°16°–63°17°
Low, likely
51°11°–54°12°
Typical high / low
68°20° / 53°12°
Wind
14 mph22 km/h, gusts 22 mph36 km/h
UV peak
4
Friday, Oct 30. Rain. High 61°16°, low 50°10°. Typical 68°20° / 53°12°. Rain 0.01 in0.3 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  20% chance
2. Afternoon
  noon–6 PM
  Sunny, 60°16°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 54°12°
  20% chance
4. Overnight
  midnight–6 AM
  Cloudy, 49°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain. Partly sunny, with a high near 61.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–62°17°
Low, likely
48°9°–51°11°
Typical high / low
68°20° / 53°12°
Wind
11 mph18 km/h, gusts 20 mph32 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 61°16°, low 47°8°. Typical 68°20° / 53°12°. Rain 0.02 in0.5 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  20% chance
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  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°–67°19°
Low, likely
42°6°–52°11°
Typical high / low
68°20° / 53°12°
Wind
11 mph17 km/h, gusts 19 mph31 km/h
UV peak
4
Sunday, Nov 1. Sunny. High 66°19°, low 46°8°. Typical 68°20° / 53°12°. Rain, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°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.
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°–73°23°
Low, likely
43°6°–48°9°
Typical high / low
68°20° / 53°12°
Wind
13 mph22 km/h, gusts 22 mph36 km/h
UV peak
4
Monday, Nov 2. Cloudy. High 64°18°, low 52°11°. Typical 67°19° / 53°12°. Rain 0.06 in1.5 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°19°
  20% chance · 0.02 in0.6 mm
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  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°–71°22°
Low, likely
49°9°–57°14°
Typical high / low
67°19° / 53°12°
Wind
8 mph13 km/h, gusts 20 mph31 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 69°, low 49°.
Tomorrow
Dry, high 68°, low 51°.
Monday
Dry, high 63°, low 49°, cooling off.
Rest of week
Mostly dry, highs 61–66°.

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 Lorenzo Creek (Alameda) above Hayward

13 mi

Below flood stage

Level: 2.6 ft
Flow: 1 cfs

Forecast peak 2.5 ft Sat 4 AM

Reading from Sat 3:20 AM · NWS gauge page

Upper San Leandro Reservoir

8.2 mi

Level: 452 ft

Reading from Sat 3 AM · NWS gauge page

Tice Creek at Rossmoor Basin

9.4 mi

Level: 0.3 ft

Reading from Sat 3:15 AM · NWS gauge page

San Lorenzo Creek (Alameda) at San Lorenzo

11 mi

Below flood stage

Level: 2.8 ft
Flow: under 1 cfs

Reading from Sat 3:30 AM · NWS gauge page

For your home

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

Heating this week

About 42% less heating than a typical week.

This week 16Typical 28

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 36°F).

Open the windows?

Today, 12:00 PM–6:00 PM

Good stretch to open the windows.

Is this typical?

San Francisco Downtown · official normals 1991–2020 · records 1874–2026

Oct 24, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

On average 2°1° colder than normal (daily mean temperature).

−3°−2°SunOct 18
−2°−1°MonOct 19
−1°TueOct 20
+1°WedOct 21
−2°−1°ThuOct 22
—FriOct 23
—SatOct 24

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

Sun & moon

Sun

Daylight: 10 h 53 min; Losing 2 min 16 s a day; shortest Dec 21, 1 h 20 min less
Golden hour: 5:43–6:35 PM; Morning 7:09–8:02 AM
Blue hour: 6:35–6:46 PM; Morning 6:59–7:09 AM; first light 6:59 AM

Stars tonight? Fair

Clear 5:14–6:59 AM, but the moon is 97% lit and up.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:48 AM · rises 5:19 PM
Full moon: Oct 25
New moon: Nov 8

Looking east from Piedmont. The highest point on the skyline is about 4,100 ft, 46 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