Fetching this spot's conditions…
Tip of the moment
Fetching this spot's conditions…
Tip of the moment
Cupertino · California
Today's take
Sea state not measured today
Water temperature
15.5 °C
Verdict
Take care
1 reading unavailable
Buoy 55 km away
water 19.3 °C
measured 1.1 h ago
When to go
The wave model is not answering, so swim comfort cannot be scored. Everything else holds — wind, water temperature, storms, UV, tide — and the safety panel below is complete.
Sea state not measured today
Pin colours:swimmablecautionnot advisedconditions not loaded yet
Forecasts come from ~8 km resolution models: very local effects (a sheltering pier, a lagoon pass) are not captured.
The sea state is read as close to the beach as the model allows, without our having verified that this water is the water at the shore (indented coast, ria, head of a bay). Take it as an order of magnitude: what comes in from open sea may not reach this far.
Wave heights are significant heights: individual waves up to 2× this height still occur.
Four wave models are compared for this point: EWAM, GWAM, Météo-France WAM and ECMWF WAM. Here the forecast comes from one of them alone: it has not been cross-checked against the others yet.
Tide times derived from modelled sea level (± a few tens of minutes) — not official tide tables.
Missing data is shown as missing — never silently estimated.
Beach locations from OpenStreetMap — © OpenStreetMap contributors (ODbL).
Weather and marine data: Open-Meteo.com (CC BY 4.0), wave models from the Deutscher Wetterdienst (CC BY 4.0). Forecasts are not guarantees. · Data fetched at 08:08 UTC
Windows, comfort score and verdicts are computed by oswim from this data — modified values, not the institutes' raw figures.
min 1 · max 14 km/h · north-west sector · gusts 18 km/h
Post-rain pollution · 0 mm over 24 h
When it rains hard, runoff from roads and fields and sewer overflows carry bacteria out to sea. Nothing significant has fallen in the last 24 hours.
Official sampling is weekly at best; between two samples, recent rain is the recognized warning signal (EEA)
Jellyfish: no recent info. If you're there, tell us what you see — even “none” helps the next swimmer.
Not assessed for this spot: Offshore wind.
In all cases: bright swim cap and tow float so boats can see you.
Consolidated ladder: World Aquatics / World Triathlon / FFTri rules + manufacturer thermal guides