October weather forecast
Ko Samui, Thailand

October in Ko Samui, Thailand, stands out as the month with the most rainfall at 310mm (12.2"). This massive increase in rainfall signifies the height of the monsoon season. Despite the heavy showers, the city's beauty remains undiluted. Tourists favor indoor activities during this month due to unpredictable weather. October retains a unique character manifesting in its excessive rainfall.

Temperature

The onset of October in Ko Samui brings an average high-temperature of a moderately hot 29.6°C (85.3°F), nearly matching the September temperature. October witnesses an average nighttime temperature of 24.3°C (75.7°F).

Heat index

The heat index in October is computed to be a fiery hot 38°C (100.4°F). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

October and November, with an average relative humidity of 85%, are the most humid months.

Rainfall

In Ko Samui, during October, the rain falls for 20 days and regularly aggregates up to 310mm (12.2") of precipitation. Throughout the year, there are 160 rainfall days, and 1960mm (77.17") of precipitation is accumulated.

Sea temperature

In Ko Samui, in October, the average water temperature is 29.3°C (84.7°F).
Note: Temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for swimming, diving, and similar water activities, ensuring pleasure and comfort for extended periods without feeling uneasy.

Daylight

In Ko Samui, the average length of the day in October is 11h and 55min.
On the first day of October, sunrise is at 06:08 and sunset at 18:10. On the last day of the month, sunrise is at 06:09 and sunset at 17:57 +07.

Sunshine

May through December, with an average of 6h of sunshine, are months with the least sunshine.

UV index

The months with the highest UV index are February through October, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an extreme health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: During October, 12 as the daily maximum UV index converts into the following advice:
Carry out all crucial safety measures, unprotected skin may burn instantly. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Apply liberally and reapply a broad-spectrum sunscreen of SPF 30+ every two hours, and promptly after any outdoor workout or a swim. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.