Napa River near St. Helena
5.7 mi- Level
- 0.5 ft
Forecast peak 1.1 ft Sat 6 AM
Reading from Sat 4:30 AM · NWS gauge page
Appearance
Starts in 1 h 38 min
Issued for this forecast zone · National Weather Service San Francisco CA
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 5:55 AM PDT at KAPC
Clear and 54°12°.
Today: low 44°7° (likely 44°7° to 54°12°), high 76°24° (likely 74°23° to 78°26°).
Now 54°12°
Clear
No precipitation expected in the next 2 hours.
From forecast models
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 6a | Clear | 49°9° (likely 49°9° to 56°13°) | 46°8° | 0% | 6 mph10 km/h from NW, gusts 9 mph15 km/h | 48% | 0% | 0 |
| Sat 7a | Sunny | 48°9° (likely 48°9° to 56°13°) | 45°7° | 0% | 6 mph10 km/h from NW, gusts 8 mph13 km/h | 51% | 0% | 0 |
| Sat 8a | Sunny | 48°9° (likely 48°9° to 56°13°) | 45°7° | 0% | 7 mph11 km/h from NNW, gusts 7 mph11 km/h | 54% | 0% | 0 |
| Sat 9a | Sunny | 54°12° (likely 54°12° to 59°15°) | 54°12° | 0% | 7 mph11 km/h from N, gusts 6 mph9 km/h | 52% | 0% | 0 |
| Sat 10a | Sunny | 60°16° (likely 60°16° to 65°18°) | 60°16° | 0% | 7 mph11 km/h from NNE, gusts 7 mph11 km/h | 47% | 0% | 1 |
| Sat 11a | Sunny | 65°18° (likely 65°18° to 70°21°) | 65°18° | 0% | 7 mph11 km/h from NNE, gusts 12 mph19 km/h | 43% | 0% | 3 |
| Sat 12p | Sunny | 70°21° (likely 70°21° to 73°23°) | 70°21° | 0% | 6 mph10 km/h from NNE, gusts 10 mph16 km/h | 39% | 0% | 4 |
| Sat 1p | Sunny | 73°23° (likely 72°22° to 76°24°) | 73°23° | 0% | 3 mph5 km/h from NE, gusts 8 mph13 km/h | 35% | 0% | 4 |
| Sat 2p | Sunny | 74°23° (likely 73°23° to 78°26°) | 75°24° | 0% | 2 mph3 km/h from ENE, gusts 7 mph11 km/h | 33% | 0% | 4 |
| Sat 3p | Sunny | 75°24° (likely 74°23° to 78°26°) | 75°24° | 0% | 2 mph3 km/h from E, gusts 8 mph13 km/h | 33% | 0% | 3 |
| Sat 4p | Sunny | 75°24° (likely 73°23° to 77°25°) | 75°24° | 0% | 0 mph0 km/h, gusts 8 mph13 km/h | 33% | 0% | 2 |
| Sat 5p | Sunny | 74°23° (likely 71°22° to 75°24°) | 74°23° | 0% | 1 mph2 km/h from S, gusts 8 mph12 km/h | 35% | 0% | 2 |
| Sat 6p | Clear | 70°21° (likely 66°19° to 71°22°) | 70°21° | 0% | 0 mph0 km/h, gusts 9 mph14 km/h | 43% | 0% | 1 |
| Sat 7p | Clear | 62°17° (likely 61°16° to 64°18°) | 62°17° | 0% | 0 mph0 km/h, gusts 6 mph10 km/h | 54% | 0% | 0 |
| Sat 8p | Clear | 58°14° (likely 58°14° to 60°16°) | 58°14° | 0% | 0 mph0 km/h, gusts 5 mph8 km/h | 60% | 0% | 0 |
| Sat 9p | Clear | 56°13° (likely 56°13° to 58°14°) | 56°13° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 62% | 2% | 0 |
| Sat 10p | Clear | 54°12° (likely 54°12° to 57°14°) | 54°12° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 64% | 1% | 0 |
| Sat 11p | Clear | 52°11° (likely 52°11° to 56°13°) | 52°11° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 67% | 0% | 0 |
| Sun 12a | Clear | 51°11° (likely 51°11° to 55°13°) | 51°11° | 0% | 0 mph0 km/h, gusts 2 mph3 km/h | 70% | 0% | 0 |
| Sun 1a | Mostly clear | 50°10° (likely 50°10° to 54°12°) | 50°10° | 0% | 0 mph0 km/h, gusts 3 mph4 km/h | 70% | 27% | 0 |
| Sun 2a | Clear | 49°9° (likely 49°9° to 53°12°) | 49°9° | 0% | 0 mph0 km/h, gusts 3 mph4 km/h | 71% | 40% | 0 |
| Sun 3a | Clear | 47°8° (likely 47°8° to 53°12°) | 47°8° | 0% | 0 mph0 km/h, gusts 2 mph3 km/h | 72% | 41% | 0 |
| Sun 4a | Clear | 46°8° (likely 46°8° to 52°11°) | 46°8° | 0% | 0 mph0 km/h, gusts 2 mph3 km/h | 73% | 11% | 0 |
| Sun 5a | Partly cloudy | 46°8° (likely 46°8° to 53°12°) | 46°8° | 0% | 1 mph2 km/h from N, gusts 2 mph3 km/h | 74% | 40% | 0 |
| Sun 6a | Partly cloudy | 44°7° (likely 44°7° to 53°12°) | 45°7° | 0% | 1 mph2 km/h from N, gusts 3 mph5 km/h | 77% | 54% | 0 |
| Sun 7a | Cloudy | 44°7° (likely 44°7° to 52°11°) | 44°7° | 0% | 1 mph2 km/h from N, gusts 3 mph4 km/h | 81% | 62% | 0 |
| Sun 8a | Partly sunny | 44°7° (likely 44°7° to 53°12°) | 44°7° | 0% | 2 mph3 km/h from NE, gusts 3 mph4 km/h | 83% | 70% | 0 |
| Sun 9a | Partly sunny | 50°10° (likely 50°10° to 57°14°) | 50°10° | 0% | 2 mph3 km/h from NE, gusts 3 mph5 km/h | 75% | 62% | 1 |
| Sun 10a | Partly sunny | 58°14° (likely 55°13° to 63°17°) | 58°14° | 0% | 2 mph3 km/h from NE, gusts 3 mph5 km/h | 64% | 63% | 2 |
| Sun 11a | Partly sunny | 64°18° (likely 61°16° to 68°20°) | 64°18° | 0% | 2 mph3 km/h from SE, gusts 4 mph6 km/h | 54% | 61% | 3 |
| Sun 12p | Partly sunny | 68°20° (likely 66°19° to 71°22°) | 69°21° | 0% | 2 mph3 km/h from SE, gusts 6 mph10 km/h | 50% | 75% | 4 |
| Sun 1p | Partly sunny | 71°22° (likely 69°21° to 73°23°) | 71°22° | 0% | 2 mph3 km/h from SE, gusts 8 mph13 km/h | 46% | 77% | 4 |
| Sun 2p | Cloudy | 73°23° (likely 70°21° to 74°23°) | 73°23° | 0% | 2 mph3 km/h from S, gusts 8 mph13 km/h | 44% | 80% | 4 |
| Sun 3p | Cloudy | 74°23° (likely 70°21° to 74°23°) | 74°23° | 0% | 2 mph3 km/h from S, gusts 8 mph13 km/h | 44% | 84% | 3 |
| Sun 4p | Cloudy | 73°23° (likely 70°21° to 73°23°) | 73°23° | 0% | 2 mph3 km/h from S, gusts 8 mph14 km/h | 44% | 88% | 3 |
| Sun 5p | Cloudy | 72°22° (likely 68°20° to 72°22°) | 72°22° | 0% | 1 mph2 km/h from SSW, gusts 9 mph14 km/h | 44% | 90% | 1 |
| Sun 6p | Cloudy | 68°20° (likely 62°17° to 68°20°) | 68°20° | 0% | 1 mph2 km/h from SSW, gusts 11 mph17 km/h | 52% | 94% | 0 |
| Sun 7p | Cloudy | 63°17° (likely 58°14° to 63°17°) | 63°17° | 0% | 1 mph2 km/h from SSW, gusts 11 mph18 km/h | 61% | 90% | 0 |
| Sun 8p | Partly cloudy | 58°14° (likely 54°12° to 59°15°) | 58°14° | 0% | 0 mph0 km/h, gusts 10 mph16 km/h | 68% | 50% | 0 |
| Sun 9p | Partly cloudy | 54°12° (likely 52°11° to 57°14°) | 54°12° | 0% | 0 mph0 km/h, gusts 7 mph12 km/h | 73% | 42% | 0 |
| Sun 10p | Clear | 52°11° (likely 51°11° to 55°13°) | 52°11° | 0% | 0 mph0 km/h, gusts 5 mph7 km/h | 78% | 20% | 0 |
| Sun 11p | Clear | 51°11° (likely 49°9° to 53°12°) | 51°11° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 81% | 22% | 0 |
| Mon 12a | Mostly clear | 49°9° (likely 49°9° to 52°11°) | 49°9° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 84% | 10% | 0 |
| Mon 1a | Mostly clear | 48°9° (likely 48°9° to 51°11°) | 48°9° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 87% | 10% | 0 |
| Mon 2a | Clear | 46°8° (likely 46°8° to 50°10°) | 46°8° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 88% | 12% | 0 |
| Mon 3a | Clear | 45°7° (likely 45°7° to 49°9°) | 45°7° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 90% | 16% | 0 |
| Mon 4a | Partly cloudy | 45°7° (likely 45°7° to 49°9°) | 45°7° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 90% | 38% | 0 |
| Mon 5a | Partly cloudy | 44°7° (likely 44°7° to 48°9°) | 44°7° | 0% | 1 mph2 km/h from W, gusts 4 mph7 km/h | 92% | 49% | 0 |
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Official NWS forecast
Today: Sunny. High near 76, with temperatures falling to around 74 in the afternoon. Northeast wind 0 to 7 mph.
Tonight: Mostly clear. Low around 44, with temperatures rising to around 46 overnight. North wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Official NWS forecast
Day: Mostly sunny. High near 74, with temperatures falling to around 72 in the afternoon. Southeast wind around 2 mph.
Night: Partly cloudy, with a low around 42. West wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Areas of fog before 8am. Mostly sunny, with a high near 71. West wind 1 to 6 mph.
Night: Patchy fog after 11pm. Mostly clear, with a low around 39.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog before 8am. Mostly sunny, with a high near 71.
Night: Partly cloudy, with a low around 42.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
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 68.
Night: Mostly cloudy, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Areas of fog before 10am, then a chance of rain. Partly sunny, with a high near 66.
Night: A chance of rain before 4am, then patchy fog and a slight chance of rain between 4am and 5am, then a chance of rain and patchy fog. Mostly cloudy, with a low around 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Areas of fog and a chance of rain before 8am, then a chance of rain and patchy fog. Partly sunny, with a high near 65.
Night: A chance of rain before midnight, then a chance of rain and patchy fog between midnight and 2am, then areas of fog and a chance of rain between 2am and 5am, then a chance of rain and patchy fog. Mostly cloudy, with a low around 42.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
20% chance
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
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.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
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.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
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.
Dry, high 76°, low 44°.
Dry, high 74°, low 42°.
Dry, high 71°, low 39°, cooling off.
Mostly dry, highs 64–71°.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (MTR) (opens in a new tab)
No meaningful changes from yesterday’s forecast.
Forecast peak 1.1 ft Sat 6 AM
Reading from Sat 4:30 AM · NWS gauge page
Forecast peak 1.9 ft Sat 6 AM
Reading from Sat 4:45 AM · NWS gauge page
Reading from Sat 12:05 AM · NWS gauge page
Reading from Fri 10:05 PM · NWS gauge page
What this week’s weather means for heating, cooling, pipes and fresh air.
About 36% less heating than a typical week.
Heating degree days, base 65°F
47, 17 and 5°F are the test points heat pumps are rated at.
Dry air outside (dew point 39°F).
Today, 10:00 AM–7:00 PM
Good stretch to open the windows.
Today’s expected high is about typical for the date.
On average 1°0° warmer than normal (daily mean temperature).
Oakville weather by month: normals, records, snow and freeze dates
Sunrise 7:27 AM, sunset 6:19 PM.
Clear 6:22–7 AM; moon 97% lit but below the horizon.
Waxing gibbous
97% lit · growing