Miri has a tropical rainforest climate and hence has two seasons which is the Southwest monsoon season and the northeast monsoon. The Southwest monsoon is the dry season that has really less rainfall and the Northeast Monsoon is the wet season from October to March.
Southwest monsoon (April to September): The season is usually associated with dry season and hence the subtropical temperature is maintained. The average temperature is 23 to 32 degree Celsius all year round.
Northeast monsoon (October to March): The season sees the most rainfall but the temperature remains moderate, the temperature in some cases might drop to 18 degree Celsius but remains constant most of the time. The average temperature is 23 to 32 degree Celsius all year round.