Stargazing from Koh Samui, Koh Phangan, and Koh Tao in December 2025

December is prime stargazing season across the Gulf of Thailand islands – the dry season brings clear, low-humidity skies (80–90% clear nights) with minimal rain, and the new moon on Dec 20 means moonless evenings from ~Dec 20–27 for the darkest views. Light pollution is low on these islands (Bortle 4–5 away from main beaches), so with a portable telescope like your NexStar 127SLT, you’ll get stunning naked-eye and magnified sights. Expect temperatures of 25–30°C (77–86°F) at night – comfortable with a light jacket.What You’ll See in December EveningsThe Gulf’s latitude (~9–10°N) gives a mix of northern and southern hemisphere views, with Orion rising early and the Milky Way arching high:

• Planets: Jupiter (bright in the east after sunset, high by midnight – telescope shows cloud bands and 4 moons); Saturn (low west at dusk, sets ~10 PM – rings sharp and open); Mars (rising late evening, reddish disc with polar cap visible in scope).
• Deep-sky highlights (best after 9–10 PM): Orion Nebula (M42 – glowing gas cloud with Trapezium stars, rising ~8 PM); Pleiades (M45 – sparkling cluster); Andromeda Galaxy (M31 – faint smudge naked-eye, bright core + halo in telescope); Hyades cluster; southern standouts like Omega Centauri (best globular cluster, fuzzy ball resolving to thousands of stars) and 47 Tucanae.
• Meteor shower: Ursids peak Dec 21–22 (~5–10/hour, occasional fireballs from near Polaris – low rates but fun on moonless nights).

The first half of December (pre-new moon) has a waxing crescent that sets early; post-25 Dec, the waxing gibbous rises later, so aim for 20–25 Dec for peak darkness.Best Locations on Each Island (Ranked by Darkness)Focus on beaches or hills away from resorts – drive/scooter 10–30 mins from main areas.Koh Samui (most developed, but easy dark spots):

1. Choeng Mon Beach far east end – 15-min drive from Chaweng; quiet, open ocean views, Bortle 4.
2. Maenam Beach north section – 20-min north of Bophut; long, undeveloped stretch.
3. Silver Beach (Thong Tanote) – 30-min south; secluded cove with zero lights.

Koh Phangan (best overall – less tourism, darker skies):

1. Haad Khom / Bottle Beach far side – 20-min scooter from Thong Sala; isolated, Bortle 3–4.
2. Thong Nai Pan Noi beach – Northeast, 25-min drive; hilly backdrop blocks lights.
3. Mae Haad viewpoint – Elevated near the pier; panoramic north views.

Koh Tao (smallest, darkest if away from Sairee):

1. Sairee Beach far north end – 10-min walk from main strip; quiet, open sea.
2. Tanote Bay (Junkyard) – 15-min scooter south; secluded, low lights.
3. Chalok Baan Kao beach – Southwest, 20-min drive; sheltered cove with hill views.

Good Hotels Close to Dark-Sky SpotsPick spots with balconies or beach access for easy setup – all under A$200/night in December 2025:Koh Samui:

• Choeng Mon Beach Resort (Choeng Mon end) – A$120–160, direct beach access, quiet balconies.
• Maenam Beach Village (Maenam north) – A$80–120, garden views, low lights.
• Silver Beach Resort (Thong Tanote) – A$100–140, secluded bungalows.

Koh Phangan:

• Thong Nai Pan Resort (Thong Nai Pan Noi) – A$90–130, hillside rooms with sky views.
• Mae Haad Bay Resort (Mae Haad) – A$70–110, elevated decks.

Koh Tao:

• Sairee Hut Dive Resort (Sairee north) – A$50–90, beachfront, quiet end.
• Lub d Tanote Bay Resort (Tanote) – A$60–100, bay views, dark cove.

These spots are 15–30 mins from ferries, with dry-season access easy. For the clearest nights, check apps like Clear Outside or Stellarium. Pack a red flashlight and bug spray – December’s perfect for island astronomy!