Biak, Indonesia climate

Af Tropical rainforest

Biak has a remarkably steady tropical climate (Tropical rainforest, Köppen Af). The hottest month is May with an average daily high near 31°C, while the coldest is July averaging around 24°C at night. Around 1507 mm of precipitation falls each year, peaking in February (184 mm) and easing off in November (88 mm).

☀️ All year

Warm

Daytime highs near 31°C most of the year.

🌙 Nights

Stays warm

Even the coolest nights stay near 24°C.

🌧️ Rain

Wet

About 1507 mm of rain a year.

Wettest in February

⛅ Sky & trend

Often grey

Overcast skies dominate much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Biak climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	30	30	30	30	31	30	30	30	30	31	31	31
Avg temp (°C)	27	27	27	27	27	27	27	27	27	27	27	27
Avg low (°C)	24	24	24	24	24	24	24	24	24	24	24	24
Precipitation (mm)	149	184	141	122	100	107	120	115	107	120	88	152

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	30	30	30	30	31	30
Avg temp (°C)	27	27	27	27	27	27
Avg low (°C)	24	24	24	24	24	24
Precipitation (mm)	149	184	141	122	100	107

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	30	30	30	31	31	31
Avg temp (°C)	27	27	27	27	27	27
Avg low (°C)	24	24	24	24	24	24
Precipitation (mm)	120	115	107	120	88	152

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	83	85	84	80	71	76	75	74	74	76	79	82
Relative humidity (%)	82	82	83	82	82	82	81	80	80	80	81	82
Wind speed (m/s)	3.3	3.4	3.4	3.1	2.9	2.8	2.8	2.8	2.7	2.8	3.0	3.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	83	85	84	80	71	76
Relative humidity (%)	82	82	83	82	82	82
Wind speed (m/s)	3.3	3.4	3.4	3.1	2.9	2.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	75	74	74	76	79	82
Relative humidity (%)	81	80	80	80	81	82
Wind speed (m/s)	2.8	2.8	2.7	2.8	3.0	3.2

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 24 years of daily observations at Frans Kaisiepo, a weather station, about 3 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →