Khao Yai National Park has three main seasons, with an annual mean temperature of 23° Celsius, though this varies greatly with the seasons.
Rainy season (May–October): Most days have high rates of precipitation. The atmosphere is humid with average temperatures of 27° C during the day dropping to 13° C at night. Streams at peak flow.
Cold season (November–February): Clear skies, sunny and cool. Average temperatures of 22° C during the day and 10° C at night. Good time for hiking.
Hot season (March–April): Humid with daytime temperatures of 20–30° C and 17° C at night.