Khao Lak, Thailand: vitamin D, best months and travel guide
Quiet palm-lined beaches and a base for the Similan Islands. Best for: divers, couples, families.
The best months for vitamin D in Khao Lak are February, when a full dose takes about 6 minutes at midday. Too hot from March to May and rainy or stormy from June to January.
Khao Lak month by month
| Month | Rating | Sun window | Peak UV | Full dose, age 30 | Afternoon high | Rainy days |
|---|---|---|---|---|---|---|
| January | Bad weather | 6.7 h | 7.5 | 7 min | 32°C | 22/30 |
| February | Excellent | 7.8 h | 8.5 | 6 min | 33°C | 14/30 |
| March | Too hot | 8.0 h | 9.0 | 6 min | 34°C | 16/30 |
| April | Too hot | 8.6 h | 8.9 | 6 min | 34°C | 20/30 |
| May | Too hot | 7.5 h | 8.0 | 7 min | 33°C | 22/30 |
| June | Bad weather | 6.9 h | 7.3 | 7 min | 30°C | 19/30 |
| July | Bad weather | 6.3 h | 6.6 | 8 min | 30°C | 25/30 |
| August | Bad weather | 7.7 h | 8.0 | 7 min | 30°C | 25/30 |
| September | Bad weather | 5.9 h | 6.7 | 8 min | 29°C | 28/30 |
| October | Bad weather | 7.0 h | 7.7 | 7 min | 30°C | 28/30 |
| November | Bad weather | 5.7 h | 6.2 | 9 min | 30°C | 27/30 |
| December | Bad weather | 6.2 h | 6.7 | 8 min | 30°C | 19/30 |
Sun window is the number of hours a day with UV Index 2.5 or higher. Full dose is the minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, for skin type III. Rainy days are days with at least 1 mm out of 30.
What to expect in Khao Lak
Quiet palm-lined beaches and a base for the Similan Islands. A hot dry season from November to February on both coasts, and monsoon rain from May to October on the Andaman side (Phuket, Krabi). The Gulf side (Samui) is driest in the first months of the year. March to May is very hot.
In Khao Lak afternoon highs average from 29°C in September to 34°C in April. The wettest month is September (about 28 rainy days out of 30) and the driest is February (14). Midday UV peaks at 9.0 in March, which is very strong, so protect your skin.
More about Thailand · Thailand in February · Best places in February
Questions about Khao Lak
When is the best time to visit Khao Lak for vitamin D?
The best months for vitamin D in Khao Lak are February, when a full dose takes about 6 minutes at midday.
What is the weather like in Khao Lak?
Afternoon highs average from 29°C in September to 34°C in April. The wettest month is September, with about 28 rainy days out of 30.
Which months should I avoid in Khao Lak?
For a beach stay, avoid the months when it is too hot from March to May and rainy or stormy from June to January.