Biak in Spring
In spring (September, October and November), Biak sees average daytime highs around 28°C and overnight lows near 26°C, with 610 mm of rain over about 76 wet days across the season. It is the warmest season of the year and the driest season of the year.
Across spring, daytime highs hold fairly steady around 28°C. The sky is clear or mostly clear about 13% of the time across spring, and the air most often feels oppressive.
Spring is Biak's 2nd-best season to visit on our travel score. Biak has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Biak's year-round climate.
- Avg daytime high
- 28°C
- warmest season of the year
- Avg overnight low
- 26°C
- Rainfall
- 610 mm
- 76 wet days
- Avg wind
- 11 km/h
- Travel score
- 3.8
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Biak in Spring
Across spring, daytime highs hold fairly steady around 28°C.
A typical spring day in Biak reaches about 28°C and drops to 26°C overnight. The warmest of the three months is November, the coolest September.
How spring really feels in Biak
Once humidity and wind are folded in, spring brings about 51 days that feel above 32°C and 0 that feel at or below 0°C.
The story in spring is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Biak weather by month
How the three spring months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 28° / 26° | 229 | 27.5 | 12.1 | 3.6 |
| Feb | 28° / 26° | 194 | 23.4 | 12 | 3.8 |
| Mar | 28° / 26° | 238 | 27.8 | 12 | 3.6 |
| Apr | 28° / 26° | 253 | 27.3 | 12 | 3.5 |
| May | 28° / 26° | 223 | 26.9 | 11.9 | 3.6 |
| Jun | 28° / 26° | 276 | 26.7 | 11.9 | 3.8 |
| Jul | 28° / 26° | 249 | 26.1 | 11.9 | 4.0 |
| Aug | 28° / 26° | 225 | 24.1 | 12 | 4.3 |
| Sep | 28° / 26° | 203 | 24.5 | 12 | 4.1 |
| Oct | 28° / 26° | 196 | 25.6 | 12 | 3.8 |
| Nov | 28° / 26° | 211 | 26.1 | 12.1 | 3.5 |
| Dec | 28° / 26° | 250 | 28.7 | 12.1 | 3.3 |
Cloud cover in Spring
The sky is clear or mostly clear about 13% of the time across spring.
Chance of precipitation in Spring
Biak gets around 610 mm of rain over 76 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 11 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 12 hours in early September to 12 h 06 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 5.3 kWh/m².
Is spring a good time to visit Biak?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is a weaker month for outdoor sightseeing in Biak.
What to pack for Biak in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Biak sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 76 days see rain.
Sea temperature near Biak in Spring
The nearest coast averages about 30°C across spring — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in November at about 30°C and coldest in March near 29°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 29 | 29 | 29 | 29 | 30 | 30 | 29 | 29 | 29 | 30 | 30 | 30 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 29 | Tropical |
| Mar | 29 | Tropical |
| Apr | 29 | Tropical |
| May | 30 | Tropical |
| Jun | 30 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 30 | Tropical |
| Nov | 30 | Tropical |
| Dec | 30 | Tropical |
UV index in Biak in Spring
Clear-sky midday UV across spring averages around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Biak peaks around March 17 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 12 (extreme).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 15 | 15 | 16 | 15 | 12 | 12 | 12 | 13 | 13 | 14 | 13 | 13 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 15 | Extreme |
| Mar | 16 | Extreme |
| Apr | 15 | Extreme |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 14 | Extreme |
| Nov | 13 | Extreme |
| Dec | 13 | Extreme |
Where is Biak?
Biak sits at 1.2°S, 136.1°E, 10 m above sea level, in Indonesia. The nearest listed city is Ransiki, 216 km away.
Topography around Biak
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Biak.
Within 3 km, the terrain around Biak has only modest variations in elevation — a maximum elevation change of 169 m around an average of 23 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 219 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,442 m.
The land around Biak is covered by water (31%), trees (30%) and grassland (22%) within 3 km, water (52%) and trees (45%) within 16 km, and water (79%) and trees (21%) within 80 km.
Indonesia travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 29% of US
- price level, 2025
- GDP per capita
- $5,060
- 2025
- Happiness
- 5.6 / 10
- World Happiness, 2025
- Safe drinking water
- 30%
- of population, 2024
- Homicide rate
- 0.3
- per 100k, 2022
- Road deaths
- 11.3
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 471
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Biak (-1.1767°, 136.082°, elevation 10 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.