Sison's weather is characterized by a relatively stable temperature range throughout the year, with minimal variation between seasons. Daytime temperatures often soar above 30°C, while nighttime temperatures rarely dip below 10°C. The warmest months are May and April, with average temperatures of 26°C, while the coolest months are January and December, with averages around 22°C. There is no distinct seasonal change in temperature, but a slight increase in temperature from February to May before stabilizing again. Overall, Sison's climate can be described as warm and humid year-round.