SeasonMapLake Toba (Toba) weather in December
Indonesia
December in Lake Toba: warm, soaked, with clean air — a gamble, with 30 rainy days.
#11 of 12 months in Lake Toba · #988 of 1383 destinations to visit in December · comfort 58/100 (tier D)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Lake Toba in December
Other months in Lake Toba
Lake Toba's forum notes February sits within the wet season, though 'wet season' doesn't mean rain all day — the typical pattern is an intense shower in the late afternoon or overnight, with clear mornings common. Regulars describe rainfall as highly variable year to year in February, and put daytime temperatures around 25-27°C with nights cooling to the low 20s°C.
Add your own note from Lake Toba's card on the map.
Lake Toba climate normals — December
| Daytime high | 25°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 21°C / 70°F | |
| Feels like (high) | 28°C / 82°F | |
| Rainfall | 334 mm / 13.2 in | ⛈ soaked |
| Rainy days | 30 days | |
| Humidity | 88% | 💦 very humid |
| Dew point | 20°C / 68°F | |
| Sunshine | 7.4 h/day | |
| Daylight | 12 h | |
| Wind | 7 km/h / 4 mph | |
| Air quality (US AQI) | 48 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Lake Toba in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsBatak Christmas, Year-end break in Indonesia, school holidays in 5 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Lake Toba's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherLake Toba's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in Lake Toba in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Wet season on the caldera
1 Oct – 30 Apr · usuallyMonsoonAfternoon and evening storms roll down the crater walls onto the lake, and the ferry to Samosir gets choppy. Mornings are usually clear, which is when the walking is done.
- Holiday
Batak Christmas
15 Dec – 5 JanChristmas & New YearCrowdedBook earlyToba is Christian Batak country and the diaspora comes home for it: full churches, brass bands, and every guesthouse on Samosir taken by families rather than travellers. Source ↗
- Season
Wet season
MonsoonRisk30 rainy days and about 334 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Where is Lake Toba?
Lake Toba in December — FAQ
- Is December a good time to visit Lake Toba?
- December in Lake Toba: warm, soaked, with clean air — a gamble, with 30 rainy days. It ranks #11 of 12 months for Lake Toba on SeasonMap's comfort score (58/100).
- What is the weather like in Lake Toba in December?
- In December, Lake Toba averages a daily high of 24.6°C and a low of 20.9°C, with about 334.3 mm of rain over roughly 30 rainy days.
- What is the air quality in Lake Toba in December?
- Lake Toba has a mean US Air Quality Index of about 48 in December.