San Lorenzo River (CA) at Big Trees
11 mi- Level
- 3.2 ft
- Flow
- 18 cfs
Forecast peak 3.1 ft Sat 3 AM
Reading from Sat 1:45 AM · NWS gauge page
Appearance
Starts in 4 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, 1.4 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 3:00 AM PDT at KWVI
Clear and 50°10°.
Today: low 48°9° (likely 48°9° to 51°11°), high 70°21° (likely 67°19° to 70°21°).
Now 50°10°
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 3a | Clear | 50°10° (likely 50°10° to 53°12°) | 50°10° | 0% | 2 mph3 km/h from NNE, gusts 6 mph9 km/h | 84% | 7% | 0 |
| Sat 4a | Clear | 50°10° (likely 50°10° to 52°11°) | 50°10° | 0% | 2 mph3 km/h from NNE, gusts 5 mph9 km/h | 83% | 3% | 0 |
| Sat 5a | Clear | 48°9° (likely 48°9° to 52°11°) | 48°9° | 0% | 2 mph3 km/h from NE, gusts 6 mph9 km/h | 82% | 0% | 0 |
| Sat 6a | Clear | 48°9° (likely 48°9° to 52°11°) | 47°8° | 0% | 3 mph5 km/h from NNE, gusts 5 mph9 km/h | 84% | 0% | 0 |
| Sat 7a | Sunny | 48°9° (likely 48°9° to 52°11°) | 47°8° | 0% | 3 mph5 km/h from NNE, gusts 6 mph9 km/h | 82% | 0% | 0 |
| Sat 8a | Sunny | 48°9° (likely 48°9° to 52°11°) | 47°8° | 0% | 5 mph8 km/h from NE, gusts 5 mph8 km/h | 79% | 0% | 0 |
| Sat 9a | Sunny | 53°12° (likely 53°12° to 58°14°) | 53°12° | 0% | 3 mph5 km/h from NE, gusts 4 mph7 km/h | 71% | 0% | 1 |
| Sat 10a | Sunny | 57°14° (likely 57°14° to 63°17°) | 57°14° | 0% | 2 mph3 km/h from SE, gusts 3 mph5 km/h | 64% | 0% | 2 |
| Sat 11a | Sunny | 61°16° (likely 61°16° to 66°19°) | 61°16° | 0% | 2 mph3 km/h from S, gusts 4 mph6 km/h | 57% | 0% | 3 |
| Sat 12p | Sunny | 64°18° (likely 64°18° to 69°21°) | 64°18° | 0% | 2 mph3 km/h from SSW, gusts 5 mph8 km/h | 53% | 0% | 4 |
| Sat 1p | Sunny | 66°19° (likely 66°19° to 70°21°) | 66°19° | 0% | 2 mph3 km/h from SW, gusts 5 mph9 km/h | 52% | 0% | 5 |
| Sat 2p | Sunny | 67°19° (likely 67°19° to 70°21°) | 67°19° | 0% | 2 mph3 km/h from SW, gusts 7 mph11 km/h | 52% | 0% | 5 |
| Sat 3p | Sunny | 69°21° (likely 67°19° to 70°21°) | 69°21° | 0% | 2 mph3 km/h from WSW, gusts 7 mph11 km/h | 52% | 0% | 4 |
| Sat 4p | Sunny | 69°21° (likely 67°19° to 70°21°) | 69°21° | 0% | 2 mph3 km/h from WSW, gusts 7 mph11 km/h | 52% | 0% | 3 |
| Sat 5p | Sunny | 67°19° (likely 66°19° to 70°21°) | 67°19° | 0% | 2 mph3 km/h from WSW, gusts 6 mph10 km/h | 53% | 0% | 2 |
| Sat 6p | Clear | 65°18° (likely 63°17° to 66°19°) | 65°18° | 0% | 1 mph2 km/h from SSW, gusts 3 mph6 km/h | 61% | 0% | 1 |
| Sat 7p | Clear | 60°16° (likely 60°16° to 62°17°) | 60°16° | 0% | 1 mph2 km/h from ENE, gusts 6 mph10 km/h | 67% | 0% | 0 |
| Sat 8p | Clear | 58°14° (likely 58°14° to 61°16°) | 58°14° | 0% | 2 mph3 km/h from E, gusts 8 mph13 km/h | 73% | 0% | 0 |
| Sat 9p | Clear | 57°14° (likely 56°13° to 58°14°) | 57°14° | 0% | 3 mph5 km/h from ENE, gusts 9 mph14 km/h | 72% | 2% | 0 |
| Sat 10p | Clear | 55°13° (likely 55°13° to 57°14°) | 55°13° | 0% | 5 mph8 km/h from ENE, gusts 9 mph14 km/h | 74% | 2% | 0 |
| Sat 11p | Clear | 54°12° (likely 54°12° to 56°13°) | 54°12° | 0% | 5 mph8 km/h from NE, gusts 9 mph14 km/h | 73% | 1% | 0 |
| Sun 12a | Clear | 54°12° (likely 53°12° to 56°13°) | 54°12° | 0% | 5 mph8 km/h from NE, gusts 8 mph13 km/h | 72% | 1% | 0 |
| Sun 1a | Clear | 53°12° (likely 53°12° to 55°13°) | 53°12° | 0% | 5 mph8 km/h from NNE, gusts 7 mph11 km/h | 73% | 0% | 0 |
| Sun 2a | Clear | 53°12° (likely 52°11° to 55°13°) | 53°12° | 0% | 3 mph5 km/h from N, gusts 5 mph8 km/h | 75% | 0% | 0 |
| Sun 3a | Clear | 52°11° (likely 52°11° to 55°13°) | 52°11° | 0% | 2 mph3 km/h from NE, gusts 6 mph9 km/h | 74% | 0% | 0 |
| Sun 4a | Clear | 52°11° (likely 52°11° to 55°13°) | 52°11° | 0% | 2 mph3 km/h from ENE, gusts 5 mph8 km/h | 73% | 34% | 0 |
| Sun 5a | Clear | 52°11° (likely 52°11° to 55°13°) | 52°11° | 0% | 2 mph3 km/h from NE, gusts 4 mph6 km/h | 72% | 42% | 0 |
| Sun 6a | Partly cloudy | 50°10° (likely 50°10° to 56°13°) | 50°10° | 0% | 2 mph3 km/h from NE, gusts 4 mph6 km/h | 75% | 38% | 0 |
| Sun 7a | Partly sunny | 51°11° (likely 51°11° to 56°13°) | 51°11° | 0% | 2 mph3 km/h from NE, gusts 4 mph6 km/h | 75% | 58% | 0 |
| Sun 8a | Partly sunny | 51°11° (likely 51°11° to 57°14°) | 51°11° | 0% | 1 mph2 km/h from ENE, gusts 4 mph7 km/h | 75% | 73% | 0 |
| Sun 9a | Partly sunny | 55°13° (likely 55°13° to 60°16°) | 55°13° | 0% | 1 mph2 km/h from ENE, gusts 4 mph6 km/h | 69% | 71% | 1 |
| Sun 10a | Cloudy | 60°16° (likely 60°16° to 64°18°) | 60°16° | 0% | 1 mph2 km/h from ENE, gusts 4 mph6 km/h | 66% | 60% | 2 |
| Sun 11a | Partly sunny | 64°18° (likely 64°18° to 66°19°) | 64°18° | 0% | 2 mph3 km/h from SSW, gusts 4 mph7 km/h | 61% | 57% | 3 |
| Sun 12p | Partly sunny | 67°19° (likely 64°18° to 68°20°) | 67°19° | 0% | 2 mph3 km/h from SSW, gusts 5 mph8 km/h | 57% | 57% | 4 |
| Sun 1p | Partly sunny | 68°20° (likely 64°18° to 68°20°) | 68°20° | 0% | 2 mph3 km/h from SSW, gusts 7 mph12 km/h | 55% | 69% | 4 |
| Sun 2p | Mostly sunny | 68°20° (likely 64°18° to 69°21°) | 68°20° | 0% | 3 mph5 km/h from WSW, gusts 8 mph14 km/h | 55% | 78% | 4 |
| Sun 3p | Mostly sunny | 69°21° (likely 63°17° to 69°21°) | 69°21° | 0% | 3 mph5 km/h from WSW, gusts 9 mph15 km/h | 55% | 80% | 4 |
| Sun 4p | Cloudy | 68°20° (likely 62°17° to 68°20°) | 68°20° | 0% | 3 mph5 km/h from WSW, gusts 10 mph16 km/h | 55% | 80% | 3 |
| Sun 5p | Cloudy | 67°19° (likely 61°16° to 67°19°) | 67°19° | 0% | 2 mph3 km/h from WSW, gusts 9 mph14 km/h | 59% | 80% | 2 |
| Sun 6p | Cloudy | 64°18° (likely 59°15° to 64°18°) | 64°18° | 0% | 2 mph3 km/h from WSW, gusts 6 mph10 km/h | 70% | 81% | 0 |
| Sun 7p | Cloudy | 61°16° (likely 56°13° to 61°16°) | 61°16° | 0% | 2 mph3 km/h from WSW, gusts 6 mph9 km/h | 78% | 76% | 0 |
| Sun 8p | Cloudy | 58°14° (likely 55°13° to 59°15°) | 58°14° | 0% | 0 mph0 km/h, gusts 6 mph9 km/h | 83% | 69% | 0 |
| Sun 9p | Clear | 56°13° (likely 54°12° to 58°14°) | 56°13° | 0% | 0 mph0 km/h, gusts 5 mph7 km/h | 86% | 32% | 0 |
| Sun 10p | Clear | 55°13° (likely 54°12° to 58°14°) | 55°13° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 88% | 32% | 0 |
| Sun 11p | Clear | 54°12° (likely 52°11° to 58°14°) | 54°12° | 0% | 1 mph2 km/h from WSW, gusts 5 mph7 km/h | 88% | 26% | 0 |
| Mon 12a | Partly cloudy | 53°12° (likely 53°12° to 59°15°) | 53°12° | 0% | 1 mph2 km/h from WSW, gusts 4 mph6 km/h | 90% | 35% | 0 |
| Mon 1a | Partly cloudy | 53°12° (likely 52°11° to 59°15°) | 53°12° | 0% | 1 mph2 km/h from WSW, gusts 3 mph4 km/h | 92% | 26% | 0 |
| Mon 2a | Partly cloudy | 52°11° (likely 51°11° to 58°14°) | 52°11° | 0% | 2 mph3 km/h from N, gusts 2 mph4 km/h | 93% | 28% | 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 70, with temperatures falling to around 67 in the afternoon. South southwest wind around 5 mph.
Tonight: Mostly clear, with a low around 48. Northeast wind around 2 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, with a high near 70. East southeast wind around 3 mph.
Night: Patchy fog after 3am. Partly cloudy, with a low around 48. Northwest wind around 2 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: Patchy fog before 8am. Sunny, with a high near 67.
Night: Mostly clear, with a low around 46.
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: Mostly sunny, with a high near 66.
Night: Partly cloudy, with a low around 48.
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: Mostly sunny, with a high near 65.
Night: Mostly cloudy, with a low around 49.
Forecasts agreeIndependent forecasts are close; the range is narrow.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
20% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog before 10am. Partly sunny, with a high near 62.
Night: A chance of rain after 11pm. Mostly cloudy, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
20% chance
Afternoon
noon–6 PM
30% chance
Evening
6 PM–midnight
30% chance
Overnight
midnight–6 AM
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 60.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
30% chance
Afternoon
noon–6 PM
30% chance
Evening
6 PM–midnight
30% chance
Overnight
midnight–6 AM
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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
30% chance
Afternoon
noon–6 PM
30% chance
Evening
6 PM–midnight
30% chance · 0.02 in0.5 mm
Overnight
midnight–6 AM
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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
20% chance
Afternoon
noon–6 PM
20% chance · 0.01 in0.3 mm
Evening
6 PM–midnight
20% chance · 0.06 in1.5 mm
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 70°, low 48°.
Dry, high 70°, low 48°.
Dry, high 67°, low 46°, cooling off.
Mostly dry, highs 60–66°.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (MTR) (opens in a new tab)
No meaningful changes from yesterday’s forecast.
Forecast peak 3.1 ft Sat 3 AM
Reading from Sat 1:45 AM · NWS gauge page
Reading from Sat 2 AM · NWS gauge page
Reading from Sat 2 AM · NWS gauge page
Reading from Sat 2 AM · NWS gauge page
What this week’s weather means for heating, cooling, pipes and fresh air.
About 62% less heating than a typical week.
Heating degree days, base 65°F
Dry air outside (dew point 45°F).
Today, 11:00 AM–7:00 PM
Good stretch to open the windows.
Today’s expected high is 3°2° colder than typical.
On average 1°0° warmer than normal (daily mean temperature).
Aptos weather by month: normals, records, snow and freeze dates
Sunrise 7:23 AM, sunset 6:19 PM.
Clear 3:22–6:57 AM; moon 96% lit, sets 5:45 AM.
Waxing gibbous
96% lit · growing