September weather forecast
Koh Chang, Thailand

September witnesses a subtle change in the weather patterns in Koh Chang. While the rainfall days stay consistently high, there is a slight decline in rainfall from August, signifying the gradual transition to the dry season. Despite a minor cooling trend in ocean temperatures, marine activities maintain their interest. Splashes of sunshine start to infiltrate the skies more frequently, heralding the end of the monsoon. Nevertheless, September still secures a significant rainfall of 523mm (20.59").

Temperature

Koh Chang experiences lowest temperatures, averaging a high-temperature of 30°C (86°F) during June through September and December.

Rainfall

In September, the rain falls for 23 days. Throughout September, 523mm (20.59") of precipitation is accumulated. Throughout the year, in Koh Chang, there are 170 rainfall days, and 3442mm (135.51") of precipitation is accumulated.

Sea temperature

In September, the average sea temperature is 29.1°C (84.4°F).
Note: Surface water temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as ideal and highly pleasant for extended enjoyment in all water activities.

Daylight

The average length of the day in September is 12h and 12min.
On the first day of September, sunrise is at 06:00 and sunset at 18:21. On the last day of the month, sunrise is at 05:59 and sunset at 18:01 +07.

Sunshine

June through September, with an average of 5h of sunshine, are months with the least sunshine in Koh Chang, Thailand.

UV index

February through October, with an average maximum UV index of 12, are months with the highest UV index in Koh Chang. A UV Index reading of 11, and higher, represents an ultimate health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In September, a regular UV index of 12 translates into these guidelines:
Undertake all critical precautions. Protection from sun harm is vital. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Stay sun-safe with clothing that is both closely woven and worn loosely. Apply and frequently reapply a broad-spectrum SPF 30+ sunscreen after every two hours, or immediately after a swim or outdoor exercise. Notice! Sand and water reflections contribute to a stronger UV exposure.