September weather forecast
Surat Thani, Thailand

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Weather in September

September brings the highest rainfall of the year to Surat Thani, with average precipitation of 188mm (7.4") over 19 days. This high rainfall makes this month the wettest period of the year. Yet, these weather conditions don't bring drastic changes to the city's temperatures, which hover at a warm range. Despite the frequent rainy days, they do not significantly impact daylight hours, allowing residents and visitors to still enjoy ample daylight. Furthermore, the sea remains at a reliable 29°C (84.2°F), comfortable for water-based activities despite the increased showers.

Temperature

Surat Thani indicates an average high-temperature of a still hot 32.4°C (90.3°F) in September, showing minor variation from August's 32.7°C (90.9°F). Throughout September, an average low-temperature of 23.2°C (73.8°F) is expected.

Heat index

The heat index in September is computed to be a blazing hot 48°C (118.4°F). Take caution: Heat exhaustion and heat cramps are probable. Heatstroke may be imminent with ongoing effort.
Heat index's context suggests values are appropriate for shady areas and slight breezes. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', combines both the air temperature and the humidity level to give a perceived human temperature. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

In Surat Thani, Thailand, the average relative humidity in September is 84%.

Rainfall

In Surat Thani, Thailand, in September, during 19 rainfall days, 188mm (7.4") of precipitation is typically accumulated. In Surat Thani, during the entire year, the rain falls for 159 days and collects up to 1622mm (63.86") of precipitation.

Sea temperature

In Surat Thani, Thailand, in September, the average water temperature is 29°C (84.2°F).
Note: Water activities including swimming and diving at temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed very pleasurable and enjoyable for extended periods, devoid of discomfort.

Daylight

The average length of the day in September in Surat Thani is 12h and 11min.
On the first day of September, sunrise is at 06:13 and sunset at 18:31. On the last day of the month, sunrise is at 06:11 and sunset at 18:14 +07.

Sunshine

In Surat Thani, the average sunshine in September is 6h.

UV index

The months with the highest UV index are February through October, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In September, a regular UV index of 12 translates into these guidelines:
Take every vital safeguard, as unprotected skin and eyes may suffer burns rapidly. 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. Tightly woven clothing, when worn loosely, shields effectively against the Sun. A sunscreen boasting a minimum SPF of 30 should be generously applied and reapplied even on cloudy days, post swim or outdoor exercise. Be careful! The Sun's UV radiation is accentuated by reflecting off sand and water.

Frequently asked questions

How hot is it in Surat Thani in September?

During September, Surat Thani experiences an average high-temperature of 32.4°C (90.3°F) and a low-temperature of 23.2°C (73.8°F). The average heat index (a.k.a. 'real feel', 'feels like'), which combines relative humidity and air temperature, in September is computed to be 48°C (118.4°F).

What is the average humidity in September in Surat Thani?

The average relative humidity in September in Surat Thani, Thailand, is 84%.

How many days does it rain in September in Surat Thani?

In Surat Thani, in September, it is raining for 19 days, with typically 188mm (7.4") of accumulated precipitation.

How warm is the water in September in Surat Thani?

In Surat Thani, the average seawater temperature in September is 29°C (84.2°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Surat Thani have in September?

In September, the average day length is 12h and 11min.

What time are sunrise and sunset in September in Surat Thani?

On the first day of September in Surat Thani, Thailand, sunrise is at 06:13 and sunset at 18:31. On the last day of the month, sunrise is at 06:11 and sunset at 18:14 +07.

How long on average sun shines in September in Surat Thani?

The average sunshine duration in September in Surat Thani, Thailand, is 6h.

What are the months with the highest UV index in Surat Thani?

The months with the highest UV index in Surat Thani, Thailand, are February through October, with an average maximum UV index of 12.

How high is the UV index in September in Surat Thani?

In September, the average daily maximum UV index in Surat Thani, Thailand, is 12. A UV Index reading of 11, and higher, represents an extreme health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Surat Thani, Thailand

Average temperature in September - Surat Thani, Thailand
  • Average high temperature in September: 32.4°C

The warmest month (with the highest average high temperature) is April (35°C).
The month with the lowest average high temperature is December (29.9°C).

  • Average low temperature in September: 23.2°C

The month with the highest average low temperature is May (23.8°C).
The coldest months (with the lowest average low temperature) are January and February (21.1°C).

Average humidity in September
Surat Thani, Thailand

Average humidity in September - Surat Thani, Thailand
  • Average humidity in September: 84%

The months with the highest relative humidity are October and November (87%).
The month with the lowest relative humidity is March (75%).

Average rainfall in September
Surat Thani, Thailand

Average rainfall in September - Surat Thani, Thailand
  • Average rainfall in September: 188.4mm

The wettest month (with the highest rainfall) is November (329.9mm).
The driest month (with the least rainfall) is February (12.3mm).

Average rainfall days in September
Surat Thani, Thailand

Average rainfall days in September - Surat Thani, Thailand
  • Average rainfall days in September: 19 days

The month with the highest number of rainy days is October (20 days).
The month with the least rainy days is February (2 days).

Average sea temperature in September
Surat Thani, Thailand

Average sea temperature in September - Surat Thani, Thailand
  • Average sea temperature in September: 29°C

The best months for swimming (with the highest average sea temperature) are April, May and June (30°C).
The coldest months (with the lowest average sea temperature) are January, February and December (28°C).

Average daylight in September /
Average sunshine in September
Surat Thani, Thailand

Average daylight in September / Average sunshine in September - Surat Thani, Thailand
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 36min).
The month with the shortest days is December (Average daylight: 11h and 36min).

  • Average sunshine in September: 6h

The months with the most sunshine are February and March (Average sunshine: 9h).
The month with the least sunshine is November (Average sunshine: 5h).

Average UV index in September
Surat Thani, Thailand

Average UV index in September - Surat Thani, Thailand
  • Average UV index in September: 12

The months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).

Surat Thani, Thailand

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