Climate and monthly weather forecastBiak, Indonesia

The climate of Biak

Biak, stepping just south of the equator in Indonesia, manifests a tropical rainforest climate, typically represented by the Köppen climate classification symbol 'Af'. Owing to its geographical locale, the town enjoys a fairly warm to hot climate throughout the year. Additionally, Biak endures a high level of humidity and heavy rainfall throughout every month, a characteristic trait of its tropical nature.

Significantly, the annual temperature high averages lingering around 29.4°C (84.9°F) to 30°C (86°F), with the lowest averages from 25.5°C (77.9°F) to 26.4°C (79.5°F). The subtle change in temperature, barely varying by a few degrees, makes Biak's climate relatively stable. True to its 'rainforest' moniker, Biak sees an impressive annual rainfall between 125mm (4.92") to 243mm (9.57") per month. Consequently, the relative humidity remains persistently high, wavering slightly between 77% to 80%. This high level of moisture retains the year-round tropical ambiance and lush green landscapes.

Sea temperature displays an equally minuscule difference, maintaining a constant 29°C (84.2°F) throughout the year, with an exception for November, when it rises slightly to 30°C (86°F). Sunshine hours range from 7.7h to 9.1h, delivering an ample display of daylight from 12.1h to 12.2h daily. Wind speed ranges from 7.5km/h (4.7mph) to 10km/h (6.2mph), implying that heavy, gusty winds are infrequent. The UV index indicates it remains at level 7 for ten months in the year, dropping slightly to 6 in February and December, hinting at reasonably consistent sun exposure.

The best time to visit Biak

Given the tropical rainforest climate, designating the "best" time to visit Biak solely hinges on individual preferences for certain weather conditions. Suppose individuals appreciate bright, sunny days interspersed with moderate rainfall. September and October, when rainfall drops to about 128mm (5.04") and 125mm (4.92") respectively, and sunshine hours increase up to 8.2h and 8.4h, are particularly appealing.

The worst time to visit Biak

Those who wish to avoid heavy rainfall might steer clear of the town from January to March. During these months, Biak experiences its highest rainfall, going up to 243mm (9.57") in March. However, bear in mind that rainfall is a constant companion in Biak, owing to its rainforest climate; hence avoiding monsoon-like conditions might not be feasible.

Spring weather in Biak

While the concept of spring does not apply in a tropical climate like Biak's, if transposing the same timeframe i.e., March to May, the town witnesses an average high temperature around 29.7°C (85.5°F) to 29.8°C (85.6°F) and a low from 26.1°C (79°F) to 26.3°C (79.3°F). Rainfall remains heavy, with March seeing the most at 243mm (9.57"), slightly decreasing to 210mm (8.27") in April and 164mm (6.46") in May.

Summer weather in Biak

Similarly, Biak does not traditionally experience "summer," but during June to August, temperature highs stay stable at 29.3°C (84.7°F) in June and August, with a slight dip to 29.1°C (84.4°F) in July. The lowest temperatures show little variation, ranging from 25.5°C (77.9°F) to 25.9°C (78.6°F). Rainfall dips slightly to a range of 181mm (7.13") to 190mm (7.48").

Autumn weather in Biak

During September to November, considered autumn in many regions, Biak continues to experience tropical weather patterns. High temperatures range from 29.2°C (84.6°F) to 30°C (86°F), while the lows fluctuate from 25.5°C (77.9°F) to 26.4°C (79.5°F). A noticeable drop in rainfall to 128mm (5.04") in September and 125mm (4.92") in October can be observed before it rises again to 170mm (6.69") in November.

Winter weather in Biak

Come December, typically the "winter" in various places, Biak hardly witnesses any change in its tropical character. High temperatures average around 29.7°C (85.5°F), with low temperatures at 26.2°C (79.2°F). Rainfall once again sees an increased 170mm (6.69"), but the humidity decreases slightly to 78%. It is essential to note, despite the universal "winter" term, Biak, like other tropical regions, remains warm throughout the year.

Weather in January

Biak, Indonesia welcomes the year with a consistent tropical climate, with humid conditions and plenty of rainfall. January is similar to most other months in this coastal city. Walking around Biak at the start of the year might require an umbrella, as the city experiences 200mm (7.87") of rainfall over almost 29 days of the month. Weather in January »

Weather in February

As February sets in, Biak's weather remains largely unchanged from January. Though there is a slight increase in rainfall at 201mm (7.91") compared to the previous month, conditions continue to be delightfully tropical. The city's tropical foliage flourishes under the still-prevailing high humidity. Weather in February »

Weather in March

March brings a significant boost in rainfall that sets it apart from the preceding months, with precipitation reaching 243mm (9.57"). Simultaneously, there's a noticeable increase in sea temperature and relative humidity too. Despite these shifts, Biak's tropical weather persists, characterized by warm temperatures, abundant humidity, and regular rainfall. Weather in March »

Weather in April

With the advent of April, Biak experiences a reduced rainfall from March, dropping to 210mm (8.27"), though the city remains in its wet season pattern. Amid the frequent showers, the climate still offers ample sunshine and daylight hours, which is typical of its tropical location. Weather in April »

Weather in May

A noticeable shift in Biak's weather becomes evident in May, as rainfall drops to 164mm (6.46"), signaling the start of a drier phase over the coming few months. A marked decrease in cloud cover is also observed, causing an incrementally increased amount of sunlight received. Weather in May »

Weather in June

June’s weather continues along the path set by May, with rainfall decreasing again to 190mm (7.48"). Despite June being one of the drier months, there is a small increase in humidity, hinting at the tropical environment of Biak. Weather in June »

Weather in July

Despite a decrease in rainfall from June to 181mm (7.13"), July is consistent with the previous couple of months in its display of a less rainy, yet characteristically tropical climate. The relative humidity remains high, while average low and high temperatures show small fluctuations typical of a largely uniform tropical climate. Weather in July »

Weather in August

August, while following the established pattern of the previous months, boasts the year’s highest sunlight figures with sun shining for approximately 9.1 hours per day. Simultaneously, rainfall decreases to 185mm (7.28"), slightly lower than in July. Weather in August »

Weather in September

September brings the least rainfall of the year, dropping down to 135mm (5.31"), which is notably lower than in August. This decrease in rainfall creates a drier environment, though it does not significantly alter the tropical nature of the climate. Weather in September »

Weather in October

The weather in October exhibits slight changes in comparison to September. Rainfall increases slightly to 128mm (5.04"), but it continues to fall on the lesser side overall, making way for a pleasantly temperate climate. October follows the climatic scheme of September with a slight increase in rain observed. Weather in October »

Weather in November

As November rolls in, Biak encounters 125mm (4.92") rainfall, with a slight decrease seen from October, maintaining the mild phase of the wet season. The climate characteristics remain persistently tropical, with high relative humidity, ample daylight hours, and uniform sea temperature. Weather in November »

Weather in December

Coming to the close of the year, December presents an increase in rainfall to 170mm (6.69"), indicating the transition back to wetter months. Alongside, there's a mild decrease in sunshine hours; however, daylight remains consistent with the past months. Weather in December »