SeasonMapLake Toba (Toba) weather in August
Indonesia
August in Lake Toba: hot, soaked, with clean air — a gamble, with 26 rainy days.
#6 of 12 months in Lake Toba · #1007 of 1383 destinations to visit in August · comfort 64/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Lake Toba in August
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 — August
| Daytime high | 26°C / 79°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 70°F | |
| Feels like (high) | 30°C / 86°F | |
| Rainfall | 256 mm / 10.1 in | ⛈ soaked |
| Rainy days | 26 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 20°C / 67°F | |
| Sunshine | 8.6 h/day | |
| Daylight | 12.2 h | |
| Wind | 6 km/h / 4 mph | |
| Air quality (US AQI) | 33 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Lake Toba in August
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 crowdstravelers describe it as peak season, Festival Danau Toba, school holidays in 4 of the markets that fill it
Sourced from traveler notes: “…of degrees regardless of season. August also falls in local high season (Indonesian Independence Day on the 17th draws domestic tou…” — Tripadvisor community
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 August
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Festival
Festival Danau Toba
1 Jun – 30 Sep · usuallyMajor festivalCrowdedThe regional government's flagship week of Batak music, canoe racing and dance, usually held on Samosir in the dry half of the year. The dates move and have been postponed more than once. Source ↗
- Season
Dry season
1 Jun – 30 Sep · usuallyThe clearest air and the flattest water of the year, when the far wall of the caldera is visible from Tuk Tuk all day. Nights on the lake stay cool enough for a blanket.
- Hazard
Sumatran haze
15 Jul – 15 Oct · usuallySmoke seasonIn a dry year, smoke from land clearing further south on the island drifts north and the caldera rim goes flat and grey. Some years it never arrives at all. Source ↗
- Season
Wet season
MonsoonRisk26 rainy days and about 256 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Where is Lake Toba?
Lake Toba in August — FAQ
- Is August a good time to visit Lake Toba?
- August in Lake Toba: hot, soaked, with clean air — a gamble, with 26 rainy days. It ranks #6 of 12 months for Lake Toba on SeasonMap's comfort score (64/100).
- What is the weather like in Lake Toba in August?
- In August, Lake Toba averages a daily high of 26.2°C and a low of 21.3°C, with about 256.3 mm of rain over roughly 25.5 rainy days.
- What is the air quality in Lake Toba in August?
- Lake Toba has a mean US Air Quality Index of about 33 in August.