Coastal Flood Advisory
Starts in 45 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, 1.5 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 6:40 AM PDT at KSFO

Colma, CA weather

Clear and 54°12°.

Mostly agree

Now 54°12°

Clear

Wind: 3 mph5 km/h; From the north-northeast. 35–9 mph14 km/h through 7 PM
Dew point: 46°8°; Comfortable
UV index: 0Low; Moderate 11 AM–5 PM · peak 5
Air quality: 37Good; PM2.5 (fine particles) · tomorrow moderate
Pressure: 30.04 inHg1017 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

5°3° cooler than this time yesterday (57°14° then, 52°11° now)

Good hours for

Above 60°16° today by 11 AM
High 68°20° today at 2 PM
Below 60°16° tonight after 7 PM

This morningUp to 61°16° by 11 AM · Clear
This afternoonNear 65°18° · Clear
TonightDown to 52°11° by 3 AM · Partly cloudy
Tomorrow morningUp to 60°16° by 11 AM · Mostly cloudy
Tomorrow afternoonNear 64°18° · Mostly cloudy
Tomorrow nightDown to 53°12° by 4 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 7a	Sunny	52°11° (likely 51°11° to 55°13°)	52°11°	0%	3 mph5 km/h from NNE, gusts 4 mph6 km/h	77%	8%	0
Sat 8a	Sunny	52°11° (likely 50°10° to 55°13°)	52°11°	0%	3 mph5 km/h from ENE, gusts 4 mph6 km/h	76%	10%	0
Sat 9a	Sunny	55°13° (likely 54°12° to 57°14°)	55°13°	0%	5 mph8 km/h from E, gusts 4 mph7 km/h	73%	10%	1
Sat 10a	Sunny	58°14° (likely 58°14° to 62°17°)	58°14°	0%	5 mph8 km/h from E, gusts 5 mph8 km/h	65%	4%	2
Sat 11a	Sunny	61°16° (likely 61°16° to 66°19°)	61°16°	0%	6 mph10 km/h from ENE, gusts 5 mph9 km/h	56%	1%	3
Sat 12p	Sunny	65°18° (likely 63°17° to 69°21°)	65°18°	0%	7 mph11 km/h from NNE, gusts 4 mph7 km/h	50%	0%	4
Sat 1p	Sunny	66°19° (likely 65°18° to 71°22°)	67°19°	0%	6 mph10 km/h from N, gusts 4 mph6 km/h	50%	0%	5
Sat 2p	Sunny	68°20° (likely 66°19° to 70°21°)	68°20°	0%	6 mph10 km/h from NNW, gusts 6 mph10 km/h	50%	0%	5
Sat 3p	Sunny	68°20° (likely 66°19° to 68°20°)	68°20°	0%	7 mph11 km/h from NW, gusts 8 mph12 km/h	53%	0%	4
Sat 4p	Sunny	67°19° (likely 64°18° to 67°19°)	67°19°	0%	9 mph14 km/h from WNW, gusts 9 mph15 km/h	54%	0%	3
Sat 5p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	9 mph14 km/h from WNW, gusts 10 mph17 km/h	57%	2%	2
Sat 6p	Clear	63°17° (likely 60°16° to 63°17°)	63°17°	0%	9 mph14 km/h from W, gusts 11 mph18 km/h	69%	2%	1
Sat 7p	Clear	58°14° (likely 57°14° to 61°16°)	59°15°	0%	7 mph11 km/h from W, gusts 11 mph17 km/h	79%	14%	0
Sat 8p	Mostly clear	57°14° (likely 55°13° to 59°15°)	57°14°	0%	6 mph10 km/h from WNW, gusts 9 mph15 km/h	84%	23%	0
Sat 9p	Clear	56°13° (likely 55°13° to 59°15°)	56°13°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	85%	22%	0
Sat 10p	Clear	56°13° (likely 54°12° to 58°14°)	56°13°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	85%	22%	0
Sat 11p	Clear	55°13° (likely 53°12° to 58°14°)	55°13°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	86%	23%	0
Sun 12a	Mostly clear	54°12° (likely 53°12° to 57°14°)	54°12°	0%	1 mph2 km/h from W, gusts 6 mph9 km/h	87%	30%	0
Sun 1a	Partly cloudy	54°12° (likely 52°11° to 57°14°)	54°12°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	86%	62%	0
Sun 2a	Cloudy	53°12° (likely 51°11° to 56°13°)	53°12°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	87%	73%	0
Sun 3a	Cloudy	52°11° (likely 50°10° to 55°13°)	52°11°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	86%	73%	0
Sun 4a	Partly cloudy	52°11° (likely 50°10° to 55°13°)	52°11°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	84%	72%	0
Sun 5a	Cloudy	52°11° (likely 49°9° to 54°12°)	52°11°	0%	2 mph3 km/h from NNW, gusts 5 mph8 km/h	85%	71%	0
Sun 6a	Mostly cloudy	51°11° (likely 49°9° to 54°12°)	51°11°	0%	2 mph3 km/h from NNW, gusts 5 mph9 km/h	88%	73%	0
Sun 7a	Cloudy	51°11° (likely 48°9° to 53°12°)	51°11°	0%	2 mph3 km/h from NNW, gusts 6 mph9 km/h	90%	77%	0
Sun 8a	Cloudy	52°11° (likely 48°9° to 54°12°)	52°11°	0%	3 mph5 km/h from ENE, gusts 6 mph10 km/h	90%	79%	0
Sun 9a	Cloudy	54°12° (likely 51°11° to 55°13°)	54°12°	0%	3 mph5 km/h from ENE, gusts 6 mph10 km/h	88%	81%	1
Sun 10a	Cloudy	57°14° (likely 54°12° to 58°14°)	57°14°	0%	3 mph5 km/h from ENE, gusts 5 mph9 km/h	85%	76%	2
Sun 11a	Cloudy	60°16° (likely 57°14° to 61°16°)	60°16°	0%	5 mph8 km/h from N, gusts 5 mph8 km/h	76%	62%	3
Sun 12p	Partly sunny	64°18° (likely 60°16° to 64°18°)	64°18°	0%	5 mph8 km/h from N, gusts 6 mph9 km/h	68%	71%	4
Sun 1p	Cloudy	65°18° (likely 62°17° to 65°18°)	65°18°	0%	5 mph8 km/h from N, gusts 7 mph11 km/h	63%	84%	4
Sun 2p	Cloudy	66°19° (likely 62°17° to 66°19°)	67°19°	0%	7 mph11 km/h from W, gusts 10 mph16 km/h	62%	84%	4
Sun 3p	Partly sunny	67°19° (likely 61°16° to 67°19°)	67°19°	0%	7 mph11 km/h from W, gusts 12 mph20 km/h	65%	76%	4
Sun 4p	Cloudy	65°18° (likely 60°16° to 65°18°)	65°18°	0%	7 mph11 km/h from W, gusts 13 mph21 km/h	67%	73%	3
Sun 5p	Cloudy	64°18° (likely 59°15° to 64°18°)	64°18°	0%	7 mph11 km/h from W, gusts 13 mph21 km/h	69%	73%	1
Sun 6p	Cloudy	62°17° (likely 57°14° to 62°17°)	62°17°	0%	7 mph11 km/h from W, gusts 12 mph20 km/h	77%	79%	0
Sun 7p	Cloudy	59°15° (likely 56°13° to 60°16°)	59°15°	0%	7 mph11 km/h from W, gusts 11 mph18 km/h	83%	87%	0
Sun 8p	Cloudy	56°13° (likely 55°13° to 59°15°)	56°13°	0%	5 mph8 km/h from WSW, gusts 12 mph19 km/h	87%	84%	0
Sun 9p	Partly cloudy	55°13° (likely 54°12° to 58°14°)	55°13°	0%	5 mph8 km/h from WSW, gusts 12 mph19 km/h	89%	57%	0
Sun 10p	Partly cloudy	55°13° (likely 54°12° to 58°14°)	55°13°	0%	5 mph8 km/h from WSW, gusts 12 mph19 km/h	89%	50%	0
Sun 11p	Clear	55°13° (likely 53°12° to 58°14°)	55°13°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	89%	26%	0
Mon 12a	Clear	54°12° (likely 52°11° to 57°14°)	55°13°	0%	5 mph8 km/h from W, gusts 10 mph17 km/h	90%	30%	0
Mon 1a	Partly cloudy	54°12° (likely 52°11° to 56°13°)	54°12°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	90%	41%	0
Mon 2a	Partly cloudy	54°12° (likely 52°11° to 56°13°)	54°12°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	91%	68%	0
Mon 3a	Partly cloudy	54°12° (likely 53°12° to 56°13°)	54°12°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	90%	63%	0
Mon 4a	Partly cloudy	53°12° (likely 53°12° to 56°13°)	53°12°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	90%	52%	0
Mon 5a	Partly cloudy	53°12° (likely 53°12° to 56°13°)	53°12°	0%	5 mph8 km/h from W, gusts 9 mph14 km/h	90%	45%	0
Mon 6a	Partly cloudy	52°11° (likely 51°11° to 56°13°)	52°11°	0%	5 mph8 km/h from W, gusts 7 mph12 km/h	92%	43%	0

Days ahead

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

Today, Oct 24. Mostly sunny. High 69°21°, low 51°11°. Typical 71°22° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  Dry
Official NWS forecast
Today: Sunny. High near 69, with temperatures falling to around 65 in the afternoon. North northeast wind 3 to 9 mph.
Tonight: Mostly clear, with a low around 51. West northwest wind 1 to 9 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–71°22°
Low, likely
50°10°–55°13°
Typical high / low
71°22° / 52°11°
Wind
9 mph14 km/h, gusts 14 mph23 km/h
UV peak
5
Tomorrow, Oct 25. Partly sunny. High 68°20°, low 52°11°. Typical 71°22° / 52°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 53°12°
  Dry
Official NWS forecast
Day: Mostly sunny. High near 68, with temperatures falling to around 64 in the afternoon. North wind 2 to 7 mph.
Night: Partly cloudy, with a low around 52. West wind around 7 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–68°20°
Low, likely
48°9°–53°12°
Typical high / low
71°22° / 52°11°
Wind
11 mph17 km/h, gusts 18 mph29 km/h
UV peak
4
Monday, Oct 26. Partly sunny. High 63°17°, low 50°10°. Typical 70°21° / 52°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 63. West northwest wind 5 to 15 mph, with gusts as high as 22 mph.
Night: Partly cloudy, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–64°18°
Low, likely
50°10°–56°13°
Typical high / low
70°21° / 52°11°
Wind
13 mph21 km/h, gusts 19 mph31 km/h
UV peak
5
Tuesday, Oct 27. Partly sunny. High 62°17°, low 51°11°. Typical 70°21° / 52°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 62.
Night: Partly cloudy, with a low around 51.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–63°17°
Low, likely
50°10°–55°13°
Typical high / low
70°21° / 52°11°
Wind
14 mph23 km/h
UV peak
5
Wednesday, Oct 28. Cloudy. High 63°17°, low 52°11°. Typical 70°21° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 57°14°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 63.
Night: Mostly cloudy, with a low around 52.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
51°11°–55°13°
Typical high / low
70°21° / 52°11°
Wind
14 mph23 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 61°16°, low 52°11°. Typical 70°21° / 52°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 57°14°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  20% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain after 5pm. Partly sunny, with a high near 61.
Night: A chance of rain. Mostly cloudy, with a low around 52.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
61°16°
Low, likely
52°11°–56°13°
Typical high / low
70°21° / 52°11°
Wind
12 mph20 km/h, gusts 22 mph36 km/h
UV peak
4
Friday, Oct 30. Rain. High 61°16°, low 51°11°. Typical 69°21° / 51°11°. Rain 0.01 in0.3 mm, 40% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 53°11°
  30% chance
2. Afternoon
  noon–6 PM
  Sunny, 59°15°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 56°13°
  20% chance
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  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 61.
Night: A chance of rain. Mostly cloudy, with a low around 51.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–61°16°
Low, likely
51°11°–53°12°
Typical high / low
69°21° / 51°11°
Wind
13 mph21 km/h, gusts 20 mph32 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 60°16°, low 51°11°. Typical 69°21° / 51°11°. Rain 0.03 in0.8 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  30% chance
2. Afternoon
  noon–6 PM
  Sunny, 60°16°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 56°13°
  20% chance
4. Overnight
  midnight–6 AM
  Clear, 51°10°
  20% chance
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
59°15°–64°18°
Low, likely
47°8°–53°12°
Typical high / low
69°21° / 51°11°
Wind
11 mph17 km/h, gusts 19 mph31 km/h
UV peak
4
Sunday, Nov 1. Sunny. High 64°18°, low 50°10°. Typical 69°21° / 51°11°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 51°10°
  20% chance
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  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°–69°21°
Low, likely
48°9°–53°12°
Typical high / low
69°21° / 51°11°
Wind
13 mph22 km/h, gusts 22 mph36 km/h
UV peak
4
Monday, Nov 2. Cloudy. High 62°17°, low 54°12°. Typical 68°20° / 51°11°. Rain 0.06 in1.5 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 55°13°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  20% chance · 0.02 in0.6 mm
3. Evening
  6 PM–midnight
  Partly 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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–65°18°
Low, likely
50°10°–60°16°
Typical high / low
68°20° / 51°11°
Wind
8 mph13 km/h, gusts 20 mph31 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 69°, low 51°.
Tomorrow
Dry, high 68°, low 52°.
Monday
Dry, high 63°, low 50°, cooling off.
Rest of week
Mostly dry, highs 60–64°.

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

Colma Creek at South San Francisco

2.1 mi

Level: 0.0 ft

Reading from Sat 6:04 AM · NWS gauge page

El Zanjon Creek at First Avenue

4.5 mi

Level: 0.1 ft

Reading from Fri 11:03 PM · NWS gauge page

Green Hills Creek at Green Hill Country Club

5.7 mi

Level: 0.1 ft

Reading from Sat 5:18 AM · NWS gauge page

San Andreas Lake near Millbrae

7.0 mi

Level: 447 ft
Flow: 16,600 cfs

Reading from Sat 4:45 AM · NWS gauge page

For your home

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

Heating this week

About 48% less heating than a typical week.

This week 15Typical 28

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 46°F).

Open the windows?

Today, 11:00 AM–6:00 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° colder 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

Colma 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: 5:44–6:36 PM; Morning 7:10–8:03 AM
Blue hour: 6:36–6:47 PM; Morning 7:00–7:10 AM; first light 7:00 AM

Stars tonight? Fair

Mostly clear 6:47 PM–12 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

Today: sets 5:48 AM · rises 5:20 PM
Full moon: Oct 25
New moon: Nov 8

Looking southeast from Colma. The highest point on the skyline is about 3,400 ft, 52 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

1 active weather alert

Coastal Flood Advisory