Measurements:
°C
°F
Koh Lanta
86°F
N 2 mph
Feels like: 92°F
Precip: 100%
World Resorts Thailand Koh Lanta Weather September Weather in Koh Lanta

Koh Lanta Weather: September

Average Day Temperature: 89.7°F
Average Night Temperature: 86.0°F
Sea Water Temperature: 88.4°F
Number of Sunny Days: 7 days
Sunshine Hours: 12.1 - 12.3 hours
Number of Rainy Days: 14 days
Precipitation Totals: 9.4 in

Air Temperature in September, °F

Select Year: 2025 2024 2023

The highest day temperature in September 2025 was 88°F. The lowest night temperature was 84°F. The average values for day and night temperatures during September were 86.2°F и 85.5°F respectivly.

Koh Lanta Water Sea Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Koh Lanta was 88.8°F. The maximum and minimum values were 87.4°F and 90.6°F respectively.

Sunny, Cloudy and Gloomy days

You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.

Precipitation Totals in September, in

Precipitation total in September for Koh Lanta is 9.4 in. It makes september the most rainy month of the year.

Wind Speed in September, mph

The average wind speed in September is 11.7 mph. It makes September the most windy month of the year for Koh Lanta.

Average Sunny Hours Per Day

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Koh Lanta in September is 6.2 hours.

Best Time to Visit Koh Lanta
The most sunny months:
March 21 days
February 18 days
April 16 days
The most warm months:
April 92.4 °F
May 92.3 °F
March 92.2 °F
Warmest sea temperature:
April 91.4 °F
May 91.4 °F
June 90.3 °F
The most cold months:
November 89.5 °F
September 89.7 °F
October 89.8 °F
The most rainy months:
September 14 days
October 14 days
May 13 days
The most windy months:
September 11 mph
August 11 mph
July 11 mph

Koh Lanta on the Weather Map

Thailand Resorts:
NAME
Bang Tao Beach +86
Bangkok +84
Karon Beach +86
Kata Beach +86
Khao Lak +84
Ko Li Pe +86
Koh Chang +86
Krabi +86
Patong Beach +86
Pattaya +86
Phi Phi +86
Phuket +86
Samet +86
Samui +84
Similan +84
24 Hours Weather Forecast
Koh Lanta
Local time: 14:11
05 dec, friday
1500 86°F
N
2 mph
1800 84°F
W
3 mph
2100 84°F
W
8 mph
06 dec, saturday
0000 82°F
W
12 mph
0300 82°F
W
11 mph
0600 82°F
SW
14 mph
0900 84°F
W
14 mph
1200 86°F
W
14 mph