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Is it good to dive White Rock today?

50 Meh

Meh at White Rock — experienced divers only

Sun 19 Jul · 0 of next 7 days divable

Observed wind 17 km/h NW Water clarity ~15 m

Today, Sun 19 Jul, White Rock is a 'Meh' day — 50/100: strong wind, strong current, clear water. Live 7-day dive conditions forecast for White Rock in the Gulf of Thailand — useful for both freediving and scuba diving. Scored on wind (with per-site directional exposure), waves, swell, ocean current, visibility and tides. 4-model ensemble-averaged, calibrated by instructor reports.

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Last update: Sun 19 Jul, 13:10 UTC · Timezone shown: Asia/Bangkok

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Dive Site
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19 Jul
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21 Jul
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22 Jul
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23 Jul
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24 Jul
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25 Jul
White Rock Koh Tao & Offshore · to 22m 1 report · ~20m viz latest: Chaba Koh Tao
50
Meh
26km/h · 0.4m
50
Meh
27km/h · 0.4m
51
Meh
25km/h · 0.4m
46
Meh
26km/h · 0.7m
46
Meh
28km/h · 0.6m
52
Meh
29km/h · 0.5m
51
Meh
29km/h · 0.4m
80–100 · Showtime
60–79 · Decent
40–59 · Meh
0–39 · Nope
Full Data Behind the Score

Every signal we use. Verify against your own readings — Windguru, Windy, your dive log. If it disagrees with reality, log your dive and we'll calibrate.

Date Scorei Windi Gusti Diri Wavesi Wave diri Periodi Swelli Currenti Cur diri SSTi Rain 7di Chl-ai Bloomi Tide rangei CAPEi Stormi Modelsi Spreadi Factorsi
Sun 19 Jul 50 26.4 24.6 W 0.42 W 2.6s 0.22 0.70 E 30.5° 29.0 0.41 0.21 0.46 3110 extreme 4 7.2 wind from exposed direction, strong current, thunderstorm risk (extreme)
pts 50/100 wind 10/30 waves 20/20 · swell 5/5 current 0/20 viz 15/20 tide 0 GFS 33.2 ICON 20.2 JMA 20.2 GEM 32
Mon 20 Jul 50 27.3 24.2 W 0.44 W 2.5s 0.22 0.60 E 30.5° 28.6 0.41 0.21 0.33 2900 extreme 4 5.4 wind from exposed direction, strong current, thunderstorm risk (extreme)
pts 50/100 wind 10/30 waves 20/20 · swell 5/5 current 0/20 viz 15/20 tide 0 GFS 32 ICON 21 JMA 24.5 GEM 31.7
Tue 21 Jul 51 25.4 23.1 W 0.44 W 2.5s 0.20 0.60 E 30.6° 19.1 0.41 0.21 0.19 2750 extreme 4 5.6 wind from exposed direction, strong current, thunderstorm risk (extreme)
pts 51/100 wind 10/30 waves 20/20 · swell 5/5 current 0/20 viz 16/20 tide 0 GFS 32.2 ICON 19.4 JMA 22.4 GEM 27.4
Wed 22 Jul 46 25.9 24 W 0.72 W 3.0s 0.26 0.60 NE 30.5° 9.8 0.41 0.21 0.06 2620 extreme 4 3.4 wind from exposed direction, strong current, thunderstorm risk (extreme)
pts 46/100 wind 10/30 waves 14/20 · swell 5/5 current 0/20 viz 17/20 tide 0 GFS 30.4 ICON 23.9 JMA 22.8 GEM 26.3
Thu 23 Jul 46 27.9 26.6 W 0.62 W 2.8s 0.38 0.60 E 30.4° 6.8 0.41 0.21 0.08 2180 high 4 8.4 wind from exposed direction, strong current, forecast uncertainty, thunderstorm risk (high)
pts 46/100 wind 10/30 waves 14/20 · swell 5/5 current 0/20 viz 17/20 tide 0 GFS 39 ICON 20.7 JMA 22.1 GEM 29.9
Fri 24 Jul 52 29.1 30.2 W 0.48 W 2.7s 0.30 0.60 E 30.3° 5.9 0.41 0.21 0.21 2390 high 4 8.2 wind from exposed direction, strong current, forecast uncertainty, thunderstorm risk (high)
pts 52/100 wind 10/30 waves 20/20 · swell 5/5 current 0/20 viz 17/20 tide 0 GFS 39.1 ICON 24.9 JMA 20.5 GEM 32
Sat 25 Jul 51 29.1 33.9 W 0.36 W 2.6s 0.22 0.60 E 30.3° 14.9 0.41 0.21 0.35 2280 high 4 10.9 wind from exposed direction, strong current, forecast uncertainty, thunderstorm risk (high)
pts 51/100 wind 10/30 waves 20/20 · swell 5/5 current 0/20 viz 16/20 tide 0 GFS 36.4 ICON 27.5 JMA 14.4 GEM 38.2

Reading the table: Each row shows one day. Below the values, a points row breaks down where the score came from — e.g. wind 22/30 means you earned 22 of 30 possible wind-points. Click the small (i) icons next to any column header to see a plain-English explanation of what the metric means and how to read it.

Sources: Wind/gust/direction and CAPE ensemble-averaged across GFS, ICON, JMA and GEM models. Waves, swell, ocean current, SST from Open-Meteo Marine. Tides from WorldTides FES2022. Satellite water-clarity (Secchi depth) and chlorophyll from Copernicus Marine Service. Calibrated by instructor reports.

How the score works

Out of 100, weighted for what matters underwater (freediving + scuba):

  • Wind (30pts) — with per-site exposure: sheltered sites get credit when wind blows from the sheltered quarter.
  • Waves (20pts) — surface chop, boat-ride comfort.
  • Swell (5pts) — long-period groundswell is rare in this enclosed gulf, so it is a light penalty; local wind-chop (counted under Waves) is the real surface driver.
  • Ocean current (20pts) — from Open-Meteo Marine ocean currents. Matters for both sports.
  • Viz (20pts) — led by satellite Secchi depth (real water clarity), plus 7-day rainfall runoff, wave-stirred bottom sediment at shallow sites, and seasonal turbidity.
  • Spring-tide penalty (−0 to −5) — applies only to shallow coastal sites (≤20m).

Forecast is ensemble-averaged across four weather models (GFS, ICON, JMA, GEM). When they disagree by >8 km/h we flag "forecast uncertainty."

Sources & caveats

Data comes from Open-Meteo Marine, a four-model weather ensemble (GFS, ICON, JMA, GEM), and Copernicus satellite water-clarity. Hover a cell for full metrics. Local factors the models can't see — boat traffic at Sail Rock, plankton blooms for whale-shark season, thermocline depth — still matter. Text us on WhatsApp for same-day conditions from the crew.

Why we built this

The most accurate Gulf of Thailand dive forecast — because the existing ones aren't

For years we relied on Windguru, Windy, and local weather apps to decide whether to run our boats. Every one of them is built for sailors — not divers. They tell you the wind speed and the wave height. They don't tell you there's a 0.8 m/s current ripping through Sail Rock that'll make your dive miserable — freediving or scuba. They don't know a plankton bloom just crashed visibility. They don't care about the thermocline at 18m, the spring-tide pull, or whether your specific dive site is sheltered from today's wind.

So we built our own. This tracker blends four weather models (GFS, ICON, JMA, GEM — averaged together), Open-Meteo's ocean data (waves, swell, ocean currents, sea-surface temperature, wave direction and period), real tide predictions from WorldTides FES2022, satellite water-clarity (Secchi depth) from Copernicus Marine as a direct visibility proxy, and atmospheric storm energy (CAPE) for thunderstorm risk. Then we score it for what matters underwater — not generic weather.

The final layer is you. Every instructor and diver who logs a post-dive report — what they actually saw, the real visibility, the real current — calibrates the forecast. Over time, ground-truth beats any algorithm. If you're diving in the Gulf, drop your report. It takes 30 seconds and makes the next boat-load of divers safer.

Who’s calibrating the forecast

Top Divers

  1. 1 Dominic 6 logs · 3 sites 140 +140 this mo
  2. 2 Diego 2 logs · 1 sites 98 +98 this mo
  3. 3 Carmen Smeets 2 logs · 2 sites 88 +88 this mo

Top shop: 100 Degrees East · 140 points

Full Leaderboard + Log Your Dive

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One email the first time the forecast crosses your threshold — max one notification every 3 days. No spam.

For Website Owners

Embed our live forecast on your site — free

Hotels, dive shops, travel blogs, villa rentals — drop a live Gulf of Thailand dive forecast onto any page in 30 seconds. Always fresh (updated hourly), no setup, no API keys, no account.

  • ✓Any of 115 Gulf dive sites, or the 7-day overview
  • ✓Mobile-responsive, lazy-loaded (no page-speed hit)
  • ✓Works on WordPress, Wix, Squarespace, Webflow, HTML
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Embedded on your site? Tell us and we'll feature your shop on our leaderboard with a backlink.

How to embed on WordPress, Wix, Squarespace, Webflow →

WordPress (Gutenberg): Add a "Custom HTML" block, paste the code. Classic editor: switch to "Text" tab, paste.

Wix: Add → Embed Code → Embed HTML → paste. Resize the frame on canvas.

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Plain HTML: Paste anywhere inside <body>.

Frequently Asked Questions

Is it good to dive White Rock today? +
Divable for experienced divers, but not ideal White Rock. Today it's a 'Meh' (50/100): strong wind, strong current, clear water. 0 of the next 7 days look divable (a score of 60+).
What are the dive conditions at White Rock this week? +
Over the next 7 days at White Rock, the dive score ranges 46–52 out of 100, with 0 divable days (60+). The tracker breaks down wind (with per-site directional exposure), waves, ocean current and satellite visibility for each day.
Will my White Rock dive trip get cancelled? +
Conditions are rough right now — only 0 of the next 7 days look divable, so trips may not run. White Rock is exposed and the call is made the morning of.
How accurate is the Gulf of Thailand dive conditions forecast? +
The forecast ensemble-averages four weather models (GFS, ICON, JMA, GEM), blends Open-Meteo Marine ocean data (waves, swell, ocean currents, SST), real tides from WorldTides FES2022, satellite water-clarity (Secchi depth) and chlorophyll from Copernicus Marine, and atmospheric storm energy. Visibility also factors in rainfall runoff and wave-stirred bottom sediment at shallow sites. Scores are tuned for diving — both freediving and scuba — prioritising ocean currents and visibility over generic marine forecasts. Instructors log actual conditions after each dive, which calibrates the model over time.
What does the dive condition score mean? +
0–100, and we label it in plain diver-speak. Above 80 is "Showtime" (flat seas, clear water, minimal current). 60–79 is "Decent" (divable with minor compromise). 40–59 is "Meh" (experienced divers only). Below 40 is "Nope" (the boat likely stays in).
Why is Sail Rock's score different from Windguru's wind forecast? +
Windguru reports raw wind. Our score weights wind 30, waves 20, swell 5, ocean currents 20, and visibility 20 — and our visibility blends satellite Secchi depth (real water clarity), rainfall runoff, wave-stirred bottom sediment and seasonal monsoon turbidity, not just wind. Plus spring-tide and gust penalties at shallow or exposed sites. Scuba divers and freedivers both care about currents and visibility as much as surface wind — most general marine forecasts ignore them.
When is the best diving season in Koh Samui and Koh Tao? +
March to May offers the calmest seas and peak whale shark season at Sail Rock, though plankton blooms can reduce visibility. June to September has good visibility and moderate weather. October to December brings the northeast monsoon with choppier conditions. Check the live tracker for day-specific scoring.
How do I report actual dive conditions to improve the forecast? +
Visit /conditions/log after your dive — submit observed visibility, current strength, thermocline depth, and an optional photo. Each report earns points, climbs the leaderboard, and improves the forecast calibration. Dive shops who submit their website get a public backlink.
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