Sunny, high near 90°. Rain chance peaks at 45% around 2 PM. Best beach window: 8 AM to 2 PM.
estimateRain Outlook
tap an hourPeak rain chance 45% around 2 PM — plan beach time outside that window.
Tide
0.3 ft · falling ↘
Wind
11 mph
from the E
UV Index
Very High
reapply every 80 min
Time to Burn
UV 10 · incl. sand glarefor unprotected fair skin (burns easily, tans a little). SPF 50, reapply every 80 minutes and after every swim.
Strongest 9 AM to 6 PM · peaks at UV 10
An estimate from the standard erythemal dose model, not a medical limit. Darker skin burns more slowly than this, people vary either way, and sunscreen only helps if you use enough of it and reapply.
Rip Current Riskestimated
todayCalm pattern today. Currents can still surprise — keep kids within reach.
Caught in one? Don’t fight it. Swim parallel to the beach until you’re free, then angle back in.
Beach Flag
Green Flag
calm, swim easy
estimated · trust the lifeguard
Water Quality
bacteria testingStinson Beach has been posted or closed for bacteria 11 times since 2022, most often for bacterial standards violation.
This is history, not today. The state archive runs months behind (through 2026-03-06), so check the county for the current posting.
Today’s official resultSource: County of Marin Environmental Health Services
Water by Monthtypical
avg 2021–2024Warmest around September (60°), coolest around March (54°).
surf’s up (gently)
Tides are NOAA predictions (Stinson Beach station 9415020); temps, wind, UV, waves and water temp are live from Open-Meteo; rip current risk from the NWS surf-zone forecast. Flag status is estimated from wave height and wind, so always trust the lifeguard’s actual flag over this app.
Right now at Stinson Beach, the water is 61°F, surf is running 3–4 ft and the air is 62°F. Wind is 5 mph from the WNW and the UV index peaks at 5 (moderate) today. Unprotected fair skin burns in about 91 minutes right now. Today’s tides: High 5:08 AM, Low 8:50 AM, High 3:14 PM, Low 11:10 PM. Stinson Beach has been posted or closed for bacteria 11 times since 2022, about 2.8 a year, most often for bacterial standards violation. Dogs are not allowed on this beach.