Siem Reap, Cambodia: vitamin D, best months and travel guide
Gateway to the temples of Angkor. Best for: culture travellers, photographers, history fans.
The best months for vitamin D in Siem Reap are November to February, when a full dose takes about 6 minutes at midday. Too hot from March to June and in August and rainy or stormy in July and from September to October.
Siem Reap month by month
| Month | Rating | Sun window | Peak UV | Full dose, age 30 | Afternoon high | Rainy days |
|---|---|---|---|---|---|---|
| January | Excellent | 7.4 h | 7.3 | 7 min | 31°C | 1/30 |
| February | Excellent | 7.8 h | 8.3 | 6 min | 33°C | 6/30 |
| March | Too hot | 7.8 h | 8.8 | 6 min | 34°C | 16/30 |
| April | Too hot | 8.8 h | 9.2 | 6 min | 37°C | 6/30 |
| May | Too hot | 7.7 h | 8.4 | 6 min | 34°C | 23/30 |
| June | Too hot | 6.7 h | 7.5 | 7 min | 33°C | 18/30 |
| July | Bad weather | 5.2 h | 6.1 | 9 min | 31°C | 28/30 |
| August | Too hot | 7.6 h | 8.3 | 6 min | 33°C | 30/30 |
| September | Bad weather | 6.6 h | 7.6 | 7 min | 31°C | 29/30 |
| October | Bad weather | 7.0 h | 7.5 | 7 min | 31°C | 23/30 |
| November | Excellent | 6.9 h | 7.1 | 8 min | 32°C | 8/30 |
| December | Good | 6.7 h | 6.6 | 8 min | 30°C | 4/30 |
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 Siem Reap
Gateway to the temples of Angkor. Hot all year, a dry season from November to April, and heavy rain from June to October. Facilities on the islands are simple. Angkor is best early in the morning.
In Siem Reap afternoon highs average from 30°C in December to 37°C in April. The wettest month is August (about 30 rainy days out of 30) and the driest is January (1). Midday UV peaks at 9.2 in April, which is very strong, so protect your skin.
Access point for Angkor Wat and various other attractions in the north (Wikivoyage, CC BY-SA 4.0)
This place is inland, so it does not count towards the country rating.
More about Cambodia · Cambodia in February · Best places in February
Questions about Siem Reap
When is the best time to visit Siem Reap for vitamin D?
The best months for vitamin D in Siem Reap are November to February, when a full dose takes about 6 minutes at midday.
What is the weather like in Siem Reap?
Afternoon highs average from 30°C in December to 37°C in April. The wettest month is August, with about 30 rainy days out of 30.
Which months should I avoid in Siem Reap?
For a beach stay, avoid the months when it is too hot from March to June and in August and rainy or stormy in July and from September to October.