Bontang-Borneo Island weather by month & the best time to visit
Indonesia · coastal city break · tropical rainforest climate
The best time to visit Bontang-Borneo Island is August — its sunniest month (Sunshine Score 71/100), with January and February close behind. Bontang-Borneo Island averages about 2,147 hours of sunshine a year. Daytime highs around 28°C / 82°F and roughly 113 mm of rain in August.
When is the best time to visit Bontang-Borneo Island?
For sunshine, the best time to visit Bontang-Borneo Island is August, then January and February. The dullest month is January (64/100, 227 mm of rain). The full month-by-month picture is in the table below.
How sunny is Bontang-Borneo Island?
Bontang-Borneo Island gets a moderate 2,147 hours of sunshine a year. Conditions barely change through the year — only 7 Sunshine Score points separate August from January. It ranks #70 of 119 destinations in Indonesia for annual sunshine, below the national median of 2,183 hours. The year's 2,246 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 64 | 28° / 82°F | 24° / 75°F | 227 mm | 10 | 31° / 88°F |
| February | 64 | 28° / 82°F | 24° / 75°F | 175 mm | 11 | 31° / 88°F |
| March | 64 | 29° / 84°F | 24° / 75°F | 214 mm | 11 | 31° / 88°F |
| April | 64 | 29° / 84°F | 24° / 75°F | 217 mm | 11 | 31° / 88°F |
| May | 64 | 29° / 84°F | 25° / 77°F | 212 mm | 10 | 32° / 90°F |
| June | 64 | 28° / 82°F | 24° / 75°F | 170 mm | 9 | 31° / 88°F |
| July | 64 | 28° / 82°F | 24° / 75°F | 156 mm | 9 | 30° / 86°F |
| August | 71 | 28° / 82°F | 24° / 75°F | 113 mm | 10 | 31° / 88°F |
| September | 64 | 29° / 84°F | 24° / 75°F | 149 mm | 10 | 31° / 88°F |
| October | 64 | 29° / 84°F | 24° / 75°F | 173 mm | 10 | 31° / 88°F |
| November | 64 | 29° / 84°F | 24° / 75°F | 205 mm | 9 | 31° / 88°F |
| December | 64 | 28° / 82°F | 24° / 75°F | 235 mm | 9 | 31° / 88°F |
Sea temperature in Bontang-Borneo Island by month
The sea off Bontang-Borneo Island is warmest in May at around 32°C / 90°F, and coolest in July at 30°C / 86°F. The water sits at a comfortable 21°C or warmer roughly all year round. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Bontang-Borneo Island: questions and answers
What kind of destination is Bontang-Borneo Island?
Bontang-Borneo Island is a coastal city break in Indonesia with a tropical rainforest climate — the sea reaches 32°C at its warmest and is swimmable (21°C+) year-round.
How many hours of sunshine does Bontang-Borneo Island get a year?
Bontang-Borneo Island gets about 2,147 hours of sunshine a year, at its best around August.
When is the best time to visit Bontang-Borneo Island?
The sunniest time to visit Bontang-Borneo Island is August, when the Sunshine Score peaks at 71/100 (with January and February close behind). Expect daytime highs around 28°C / 82°F.
What is the least sunny month in Bontang-Borneo Island?
January is the least sunny month in Bontang-Borneo Island, scoring 64/100 with about 227 mm of rain.
What is the sea temperature in Bontang-Borneo Island?
The sea in Bontang-Borneo Island ranges from about 30°C (July) to 32°C (May). Month-by-month sea temperatures are on this page.
How strong is the sun in Bontang-Borneo Island?
The typical midday UV index in Bontang-Borneo Island peaks around 11 (extreme) in February, easing to about 9 (very high) in June. Month-by-month midday UV values are in the UV column of the table on this page.
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