Ready-made plans

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Best Time for North Sumatra: Orangutans to Lake Toba

Last updated: 2026-09-22

Preferred months for this journey: May, June, July, August, September. Check the seasonal notes before choosing your dates.

The drier May–September window is the supported baseline for the licensed-guide forest day, highland roads and Lake Toba crossing; rain can still occur.
Wetter months can make forest trails, highland roads and ferry connections less predictable; this baseline refuses them pending a separate dated review.

Month	Low	High	Rain	Daylight
January	18.6°C	24.5°C	193 mm	11.8 h
February	18.7°C	25.1°C	144 mm	11.9 h
March	19.0°C	25.5°C	204 mm	12.0 h
April	19.6°C	25.7°C	191 mm	12.1 h
May	19.7°C	25.6°C	227 mm	12.1 h
June	19.0°C	24.9°C	162 mm	12.2 h
July	18.7°C	24.7°C	207 mm	12.2 h
August	18.6°C	24.8°C	246 mm	12.1 h
September	18.7°C	24.8°C	302 mm	12.0 h
October	18.8°C	24.7°C	362 mm	11.9 h
November	18.9°C	24.5°C	312 mm	11.9 h
December	18.8°C	24.2°C	292 mm	11.8 h