Are Wet/Dry Seasons Reversed Across the Equator in Southeast Asia? No

Wet and dry seasons in Southeast Asia are not simply reversed across the equator. While both hemispheres experience monsoons, the timing differs due to the Intertropical Convergence Zone (ITCZ) migration.

How It Works

• The ITCZ — a belt of low pressure and heavy rain — shifts north/south with the sun.
• When ITCZ is north (May–Oct), Northern Hemisphere SE Asia (e.g., Thailand, Vietnam, Philippines) gets wet season; Southern Hemisphere (e.g., southern Indonesia, East Timor) gets dry season.
• When ITCZ moves south (Nov–Apr), the pattern reverses: southern regions get rain, northern regions dry out.

Thus, seasons are governed by ITCZ position, not merely hemisphere. The transition zones near the equator (Singapore, southern Malaysia) often have two wet peaks or less distinct seasons.