January weather forecast
Rayong, Thailand

The start of the year in Rayong, Thailand, brings stable weather. Although remaining relatively warm, tourists might notice a distinct decrease in humidity when comparing to the latter part of the year. Ample daylight and sparse rainfall make it a suitable time for outdoor activities. Notably, this period sees the lowest humidity with values only reaching 70%. Travelers venturing towards the sea will encounter welcoming temperatures.

Temperature

January and September are known as Rayong's coldest months, with an average high-temperature of 31.9°C (89.4°F).

Heat index

The average heat index in January is estimated at a blistering 42°C (107.6°F). Take more safety measures, heat exhaustion and heat cramps are potential outcomes. Persistent activity might lead to heatstroke.
Heat index details are generally centered around shaded locations and a mild breeze. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a composite of temperature and humidity figures to convey how warm it feels. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

The average relative humidity in January is 74%.

Rainfall

In Rayong, during January, the rain falls for 2 days and regularly aggregates up to 21mm (0.83") of precipitation. Throughout the year, in Rayong, there are 111 rainfall days, and 1383mm (54.45") of precipitation is accumulated.

Sea temperature

The month with the coldest seawater is January, with an average sea temperature of 27.3°C (81.1°F).
Note: Swimming, diving, and other water endeavors at temperatures between 25°C (77°F) and 29°C (84.2°F) are considered enjoyable and satisfying for extended periods without discomfort.

Daylight

In Rayong, the average length of the day in January is 11h and 28min.
On the first day of the month, sunrise is at 06:36 and sunset at 18:00. On the last day of January, sunrise is at 06:41 and sunset at 18:16 +07.