Coastal Flood Advisory
Starts in 7 h 20 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)

Observed 12:10 AM PDT at KAPC

American Canyon, CA weather

Clear and 52°11°.

Forecasts agree

Now 52°11°

Clear

Wind: Calm; Up to 5 mph8 km/h through 12 PM
Dew point: 48°9°; Comfortable · down to 37°3° by 1 AM
UV index: 0Low; Moderate 11 AM–5 PM · peak 5
Air quality: 63Moderate; PM2.5 (fine particles) · tomorrow good
Pressure: 30.03 inHg1017 hPa; Steady over the next 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (54°12° then, 54°12° now)

Good hours for

Low 48°9° today at 7 AM
Above 60°16° today by 11 AM
High 70°21° today at 3 PM
Below 60°16° tonight after 8 PM

TonightDown to 49°9° by 5 AM · Clear
This morningUp to 61°16° by 11 AM · Clear
This afternoonUp to 70°21° by 3 PM · Clear
TonightDown to 48°9° by 4 AM · Partly cloudy
Tomorrow morningUp to 59°15° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 69°21° by 3 PM · Mostly cloudy
Tomorrow nightDown to 54°12° by 11 PM · 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 12a	Clear	54°12° (likely 50°10° to 57°14°)	54°12°	0%	5 mph8 km/h from NNW, gusts 3 mph5 km/h	56%	0%	0
Sat 1a	Clear	54°12° (likely 50°10° to 56°13°)	54°12°	0%	5 mph8 km/h from N, gusts 2 mph3 km/h	53%	0%	0
Sat 2a	Clear	52°11° (likely 50°10° to 56°13°)	52°11°	0%	5 mph8 km/h from NNE, gusts 4 mph6 km/h	51%	0%	0
Sat 3a	Clear	51°11° (likely 49°9° to 56°13°)	51°11°	0%	3 mph5 km/h from ENE, gusts 2 mph4 km/h	52%	0%	0
Sat 4a	Clear	51°11° (likely 49°9° to 55°13°)	50°10°	0%	3 mph5 km/h from ESE, gusts 3 mph5 km/h	53%	3%	0
Sat 5a	Clear	49°9° (likely 48°9° to 55°13°)	48°9°	0%	3 mph5 km/h from SE, gusts 5 mph8 km/h	54%	6%	0
Sat 6a	Clear	49°9° (likely 48°9° to 54°12°)	48°9°	0%	3 mph5 km/h from SE, gusts 5 mph8 km/h	56%	7%	0
Sat 7a	Sunny	48°9° (likely 48°9° to 53°12°)	49°9°	0%	2 mph3 km/h from SSE, gusts 4 mph7 km/h	58%	8%	0
Sat 8a	Sunny	48°9° (likely 48°9° to 54°12°)	48°9°	0%	2 mph3 km/h from SSE, gusts 3 mph5 km/h	64%	10%	0
Sat 9a	Sunny	54°12° (likely 52°11° to 56°13°)	54°12°	0%	2 mph3 km/h from SE, gusts 2 mph3 km/h	62%	6%	1
Sat 10a	Sunny	58°14° (likely 57°14° to 61°16°)	58°14°	0%	2 mph3 km/h from SSE, gusts 3 mph5 km/h	62%	0%	2
Sat 11a	Sunny	61°16° (likely 61°16° to 65°18°)	61°16°	0%	2 mph3 km/h from SSW, gusts 3 mph6 km/h	59%	0%	3
Sat 12p	Sunny	66°19° (likely 64°18° to 68°20°)	66°19°	0%	3 mph5 km/h from SSW, gusts 5 mph8 km/h	51%	0%	4
Sat 1p	Sunny	67°19° (likely 66°19° to 70°21°)	67°19°	0%	3 mph5 km/h from SSW, gusts 4 mph7 km/h	47%	0%	5
Sat 2p	Sunny	69°21° (likely 69°21° to 71°22°)	69°21°	0%	3 mph5 km/h from SW, gusts 6 mph9 km/h	45%	0%	5
Sat 3p	Sunny	70°21° (likely 70°21° to 71°22°)	71°22°	0%	3 mph5 km/h from SW, gusts 5 mph8 km/h	44%	0%	4
Sat 4p	Sunny	70°21° (likely 70°21° to 72°22°)	70°21°	0%	3 mph5 km/h from SSW, gusts 7 mph11 km/h	44%	0%	3
Sat 5p	Sunny	70°21° (likely 69°21° to 70°21°)	70°21°	0%	2 mph3 km/h from SW, gusts 8 mph13 km/h	44%	5%	2
Sat 6p	Clear	67°19° (likely 64°18° to 67°19°)	67°19°	0%	0 mph0 km/h, gusts 8 mph13 km/h	53%	37%	1
Sat 7p	Clear	61°16° (likely 60°16° to 63°17°)	61°16°	0%	1 mph2 km/h from SW, gusts 4 mph7 km/h	63%	33%	0
Sat 8p	Clear	58°14° (likely 57°14° to 61°16°)	58°14°	0%	1 mph2 km/h from SW, gusts 4 mph6 km/h	70%	34%	0
Sat 9p	Clear	56°13° (likely 55°13° to 59°15°)	56°13°	0%	0 mph0 km/h, gusts 4 mph7 km/h	74%	38%	0
Sat 10p	Clear	55°13° (likely 54°12° to 58°14°)	55°13°	0%	0 mph0 km/h, gusts 4 mph6 km/h	78%	28%	0
Sat 11p	Clear	54°12° (likely 53°12° to 57°14°)	54°12°	0%	0 mph0 km/h, gusts 4 mph6 km/h	83%	2%	0
Sun 12a	Clear	52°11° (likely 51°11° to 57°14°)	52°11°	0%	0 mph0 km/h, gusts 4 mph7 km/h	81%	1%	0
Sun 1a	Clear	52°11° (likely 50°10° to 55°13°)	52°11°	0%	0 mph0 km/h, gusts 4 mph6 km/h	80%	2%	0
Sun 2a	Clear	50°10° (likely 49°9° to 55°13°)	51°11°	0%	0 mph0 km/h, gusts 4 mph7 km/h	82%	20%	0
Sun 3a	Mostly clear	49°9° (likely 49°9° to 54°12°)	49°9°	0%	0 mph0 km/h, gusts 5 mph7 km/h	82%	61%	0
Sun 4a	Mostly clear	48°9° (likely 48°9° to 53°12°)	48°9°	0%	1 mph2 km/h from W, gusts 4 mph6 km/h	84%	79%	0
Sun 5a	Partly cloudy	48°9° (likely 48°9° to 52°11°)	48°9°	0%	1 mph2 km/h from NE, gusts 3 mph6 km/h	83%	82%	0
Sun 6a	Partly cloudy	46°8° (likely 46°8° to 52°11°)	46°8°	0%	1 mph2 km/h from NE, gusts 3 mph4 km/h	85%	83%	0
Sun 7a	Partly sunny	46°8° (likely 46°8° to 52°11°)	46°8°	0%	1 mph2 km/h from NE, gusts 4 mph6 km/h	85%	82%	0
Sun 8a	Partly sunny	47°8° (likely 47°8° to 52°11°)	47°8°	0%	2 mph3 km/h from ENE, gusts 4 mph7 km/h	88%	81%	0
Sun 9a	Partly sunny	50°10° (likely 50°10° to 55°13°)	51°11°	0%	2 mph3 km/h from ENE, gusts 5 mph8 km/h	83%	68%	1
Sun 10a	Cloudy	56°13° (likely 54°12° to 59°15°)	56°13°	0%	2 mph3 km/h from ENE, gusts 5 mph9 km/h	80%	68%	2
Sun 11a	Cloudy	59°15° (likely 57°14° to 63°17°)	59°15°	0%	3 mph5 km/h from ESE, gusts 5 mph8 km/h	74%	70%	3
Sun 12p	Partly sunny	64°18° (likely 60°16° to 66°19°)	64°18°	0%	3 mph5 km/h from ESE, gusts 7 mph11 km/h	66%	75%	4
Sun 1p	Partly sunny	66°19° (likely 62°17° to 69°21°)	66°19°	0%	3 mph5 km/h from ESE, gusts 7 mph11 km/h	62%	79%	4
Sun 2p	Cloudy	68°20° (likely 63°17° to 70°21°)	68°20°	0%	3 mph5 km/h from SSW, gusts 7 mph11 km/h	58%	85%	4
Sun 3p	Cloudy	69°21° (likely 65°18° to 71°22°)	69°21°	0%	3 mph5 km/h from SSW, gusts 7 mph12 km/h	54%	86%	3
Sun 4p	Cloudy	69°21° (likely 65°18° to 70°21°)	69°21°	0%	3 mph5 km/h from SSW, gusts 9 mph15 km/h	54%	84%	3
Sun 5p	Cloudy	69°21° (likely 63°17° to 69°21°)	69°21°	0%	1 mph2 km/h from SW, gusts 9 mph15 km/h	53%	87%	1
Sun 6p	Cloudy	66°19° (likely 63°17° to 68°20°)	66°19°	0%	1 mph2 km/h from SW, gusts 6 mph10 km/h	62%	90%	0
Sun 7p	Mostly clear	62°17° (likely 60°16° to 66°19°)	62°17°	0%	1 mph2 km/h from SW, gusts 6 mph10 km/h	70%	83%	0
Sun 8p	Partly cloudy	58°14° (likely 57°14° to 64°18°)	58°14°	0%	2 mph3 km/h from WSW, gusts 6 mph9 km/h	77%	85%	0
Sun 9p	Partly cloudy	56°13° (likely 54°12° to 63°17°)	56°13°	0%	2 mph3 km/h from WSW, gusts 6 mph9 km/h	82%	72%	0
Sun 10p	Partly cloudy	55°13° (likely 52°11° to 62°17°)	55°13°	0%	2 mph3 km/h from WSW, gusts 5 mph8 km/h	86%	58%	0
Sun 11p	Mostly clear	54°12° (likely 51°11° to 61°16°)	54°12°	0%	2 mph3 km/h from WSW, gusts 5 mph9 km/h	89%	36%	0

Days ahead

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

Today, Oct 24. Sunny. High 71°22°, low 48°9°. Typical 76°24° / 48°9°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 48°9°
  Dry
Official NWS forecast
Today: Sunny, with a high near 71. South wind around 3 mph.
Tonight: Clear, with a low around 48. Northeast wind around 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
70°21°–72°22°
Low, likely
47°8°–53°12°
Typical high / low
76°24° / 48°9°
Wind
8 mph12 km/h
UV peak
5
Tomorrow, Oct 25. Partly sunny. High 70°21°, low 46°8°. Typical 75°24° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 52°11°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 70. East southeast wind around 3 mph.
Night: Partly cloudy, with a low around 46. West southwest wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
68°20°–70°21°
Low, likely
46°8°–51°11°
Typical high / low
75°24° / 48°9°
Wind
8 mph13 km/h
UV peak
4
Monday, Oct 26. Cloudy. High 66°19°, low 44°7°. Typical 75°24° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 51°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
  Clear, 49°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 66.
Night: Patchy fog after 2am. Mostly clear, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–69°21°
Low, likely
44°7°–54°12°
Typical high / low
75°24° / 48°9°
Wind
12 mph20 km/h, gusts 23 mph37 km/h
UV peak
5
Tuesday, Oct 27. Partly sunny. High 66°19°, low 45°7°. Typical 74°23° / 47°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Areas of fog before 10am. Mostly sunny, with a high near 66.
Night: Partly cloudy, with a low around 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–68°20°
Low, likely
43°6°–52°11°
Typical high / low
74°23° / 47°8°
Wind
14 mph22 km/h
UV peak
5
Wednesday, Oct 28. Fog. High 64°18°, low 47°8°. Typical 74°23° / 47°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog between 7am and 9am. Partly sunny, with a high near 64.
Night: Mostly cloudy, with a low around 47.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–66°19°
Low, likely
46°8°–52°11°
Typical high / low
74°23° / 47°8°
Wind
8 mph13 km/h, gusts 15 mph24 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 62°17°, low 47°8°. Typical 74°23° / 47°8°. Rain, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°10°
  20% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog before 11am, then a slight chance of rain. Partly sunny, with a high near 62.
Night: A slight chance of rain before 5am, then a chance of rain and patchy fog. Mostly cloudy, with a low around 47.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
61°16°–67°19°
Low, likely
45°7°–55°13°
Typical high / low
74°23° / 47°8°
Wind
9 mph14 km/h, gusts 15 mph24 km/h
UV peak
4
Friday, Oct 30. Rain. High 61°16°, low 49°9°. Typical 73°23° / 47°8°. Rain 0.04 in1 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  20% chance · 0.02 in0.5 mm
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  20% chance · 0.01 in0.3 mm
3. Evening
  6 PM–midnight
  Clear, 55°13°
  20% chance
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  20% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain and patchy fog. Partly sunny, with a high near 61.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
59°15°–66°19°
Low, likely
43°6°–53°12°
Typical high / low
73°23° / 47°8°
Wind
9 mph14 km/h, gusts 18 mph29 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 64°18°, low 46°8°. Typical 73°23° / 47°8°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  20% chance
2. Afternoon
  noon–6 PM
  Sunny, 65°19°
  30% chance
3. Evening
  6 PM–midnight
  Clear, 57°14°
  20% chance
4. Overnight
  midnight–6 AM
  Clear, 50°10°
  30% 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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–69°21°
Low, likely
35°2°–53°12°
Typical high / low
73°23° / 47°8°
Wind
7 mph10 km/h, gusts 18 mph29 km/h
UV peak
3
Sunday, Nov 1. Sunny. High 69°21°, low 49°9°. Typical 72°22° / 46°8°. Rain 0.01 in0.3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  20% chance
2. Afternoon
  noon–6 PM
  Sunny, 70°21°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 60°16°
  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
65°18°–73°23°
Low, likely
42°6°–58°14°
Typical high / low
72°22° / 46°8°
Wind
10 mph16 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 67°19°, low 53°12°. Typical 72°22° / 46°8°. Rain 0.02 in0.5 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 54°12°
  20% chance
2. Afternoon
  noon–6 PM
  Partly sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 62°17°
  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
63°17°–74°23°
Low, likely
49°9°–60°16°
Typical high / low
72°22° / 46°8°
Wind
9 mph15 km/h, gusts 20 mph33 km/h
UV peak
4

10 days15 days30 days

The outlook

Today
Dry, high 71°, low 48°.
Tomorrow
Dry, high 70°, low 46°.
Monday
Dry, high 66°, low 44°, cooling off.
Rest of week
Mostly dry, highs 61–69°.

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

Napa River at Brazos Drawbridge

3.3 mi

Level: 2.4 ft

Reading from Fri 10:40 PM · NWS gauge page

Tulucay Creek at Shurtleff Avenue

7.7 mi

Below flood stage

Level: 0.1 ft

Reading from Fri 8:05 PM · NWS gauge page

Napa River at Downtown Napa

8.3 mi

Level: 5.1 ft

Reading from Fri 10:38 PM · NWS gauge page

Napa Creek at Highway 29

8.8 mi

Below flood stage

Level: 3.0 ft

Reading from Fri 5:45 PM · 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 17Typical 29

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 3
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at.

Comfort

Dry air outside (dew point 48°F).

Open the windows?

Today, 11:00 AM–7:00 PM

Good stretch to open the windows.

Is this typical?

NAPA STATE HOSPITAL · official normals 1991–2020 · records 1893–2026

Oct 24, today vs a typical year

Today’s expected high is 5°3° colder than typical.

Last 7 days vs normal

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

+3°+2°SunOct 18
—MonOct 19
−3°−2°TueOct 20
+1°±0°WedOct 21
+1°±0°ThuOct 22
+3°+2°FriOct 23
—SatOct 24

American Canyon weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 52 min; Losing 2 min 16 s a day; shortest Dec 21, 1 h 21 min less
Golden hour: 5:42–6:35 PM; Morning 7:10–8:03 AM
Blue hour: 6:35–6:45 PM; Morning 7:00–7:10 AM; first light 7:00 AM

Stars tonight? Good

Clear 12:40–7 AM; moon 96% lit, sets 5:48 AM.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:48 AM · rises 5:18 PM
Full moon: Oct 25
New moon: Nov 8

Looking north from American Canyon. The highest point on the skyline is about 2,600 ft, 17 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