Son La experiences a temperate climate with distinct seasons. Spring brings mild temperatures in February and March, averaging around 18-20°C, while April's temperatures rise to 22-25°C. Summer months from May to July are hot and humid, with June being the warmest month at an average of 28-32°C. Autumn cools down significantly, with September seeing temperatures drop to 19-23°C. Winters in Son La are cool and dry, with January averaging around 12-15°C.