Satellite view of Koh Tao with approximate depth contours every 10 m

Koh Tao in October

October is outside the peak season in Koh Tao (best: Mar-May). Expect water around 29 °C at the surface and 29 °C at depth, with about 25 m of visibility.

Season
Off peak
Water
29 °C
Visibility
25 m
Waves
0.4 m
Species likely
414
Best sites for October SeptemberNovember
Koh Tao from Sentinel-2, 1 December 2025 · Contains modified Copernicus Sentinel data 2025; depth contours approximate (NOAA ETOPO 2022)
October at a glance

What October is like in Koh Tao.

Month grade from logged dives across 23 sites: visibility, sea state and sightings. Tap a month to compare.

Divegrade month grade, 0 to 10Best monthsOther months
October · Off peakOutside the best months (Mar-May)

Surface 29 °C, at depth 29 °C, visibility 25 m, waves about 0.4 m.

Peak seasonBest: March, April, May

Compare Koh Tao in March or see the whole year on the Koh Tao page.

Where to dive in October

Best dive sites in Koh Tao in October.

Ranked by Divegrade score for October. Each line shows the site's October conditions where divers have logged them.

Interactive map loads here. Every site on it is also listed on this page.

  1. 01Chumpon Pinnacle26 m viz · 29 °C · Advanced · 12-45 m8.3
  2. 02HTMS Sattakut26 m viz · 29 °C · Advanced · 18-31 m8.0
  3. 03White Rock26 m viz · 29 °C · Open Water · 2-26 m7.9
  4. 04Twins26 m viz · 29 °C · Beginner · 5-25 m7.8
  5. 05Hin Ngam25 m viz · 29 °C · Beginner · 3-16 m7.7
  6. 06Aow Tanote25 m viz · 29 °C · Beginner · 2-20 m7.6

Site list photos: (c) portioid, some rights reserved (CC BY), via iNaturalist (CC BY) · Leonard Low from Australia, via Wikimedia Commons (CC BY 2.0), Moon wrasse, taken elsewhere · (c) Dan Schofield, some rights reserved (CC BY), via Wikimedia Commons (CC BY 4.0) · (c) Jan Ebr & Ivana Ebrová, some rights reserved (CC BY), via Wikimedia Commons (CC BY 4.0) · (c) Kat Lim, some rights reserved (CC BY), via iNaturalist (CC BY) · (c) Jean Jacques Godon, some rights reserved (CC BY), via iNaturalist (CC BY) · Amada44, via Wikimedia Commons (CC BY SA 3.0) · (c) Jan Ebr & Ivana Ebrová, some rights reserved (CC BY), via iNaturalist (CC BY) · (c) ig: underwater.logs, some rights reserved (CC BY), via iNaturalist (CC BY) · (c) luluchouette, some rights reserved (CC BY), via iNaturalist (CC BY) · H. Schlegel, via Wikimedia Commons (PD), Doublebar Rabbitfish, taken elsewhere · (c) Gonzalo Ganda Álvarez, some rights reserved (CC BY), via iNaturalist (CC BY) · (c) Shane Austin, some rights reserved (CC BY), via iNaturalist (CC BY).

What you'll see in October

Moon wrasse on 20% of dives.

Chance per dive in October across all sites here, from sightings in logged dives.

Also likely in October 410 species · chance per dive

Other months

Peak season: March, April, May.

All 23 dive sites in Koh Tao

More places to dive

Pair it, or trade up.

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A mobula ray swimming in open blue water, a remora on its back
Mobula rayMobula sp.15 m · Princess Alice Bank, Azores
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