Climate averages 1991–2020
Bontang weather
by month.
See how the year changes. October (tied with September) has the highest average daily maximum; August has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Bontang averages a daytime high of 29.2°C and a nighttime low of 24.3°C, with about 2,209 mm of rain on roughly 296 days. October (tied with September) is the warmest month (average high 29.6°C) and July (tied with January) the coolest (28.9°C). December is the wettest month with 248 mm; August is the driest with 124 mm.
The annual picture
A year in Bontang
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Bontang climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.9°C24.1°C | 24.1°C | 205 | 25.2 | 12.112 h |
| February | 29.1°C24.2°C | 24.2°C | 164 | 22.1 | 12.112 h |
| March | 29.3°C24.3°C | 24.3°C | 206 | 25.3 | 12.112 h |
| April | 29.4°C24.4°C | 24.4°C | 214 | 26.5 | 12.112 h |
| May | 29.3°C24.6°C | 24.6°C | 197 | 27.0 | 12.112 h |
| June | 29.0°C24.4°C | 24.4°C | 177 | 24.8 | 12.112 h |
| July | 28.9°C24.2°C | 24.2°C | 150 | 22.3 | 12.112 h |
| August | 29.2°C24.3°C | 24.3°C | 124 | 19.9 | 12.112 h |
| September | 29.6°C24.4°C | 24.4°C | 130 | 20.4 | 12.112 h |
| October | 29.6°C24.4°C | 24.4°C | 176 | 25.3 | 12.112 h |
| November | 29.2°C24.2°C | 24.2°C | 220 | 28.3 | 12.112 h |
| December | 29.1°C24.1°C | 24.1°C | 248 | 28.9 | 12.112 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- SamarindaIndonesia · 79 kmHigh 30.0°C · Low 23.4°C · 2,965 mm rain a year
- Loa JananIndonesia · 91 kmHigh 30.0°C · Low 23.6°C · 2,927 mm rain a year
- NusantaraIndonesia · 150 kmHigh 29.5°C · Low 23.5°C · 3,164 mm rain a year
- BalikpapanIndonesia · 172 kmHigh 28.2°C · Low 24.3°C · 2,385 mm rain a year
- TarakanIndonesia · 354 kmHigh 28.1°C · Low 24.8°C · 2,885 mm rain a year
- Toli-ToliIndonesia · 384 kmHigh 26.8°C · Low 21.1°C · 2,067 mm rain a year
- MajeneIndonesia · 440 kmHigh 28.3°C · Low 25.2°C · 1,333 mm rain a year
- TawauMalaysia · 459 kmHigh 29.1°C · Low 24.2°C · 2,162 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+8, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 0.10°, 117.40° (10 km from the city centre), adjusted up by 0.2°C for the difference between the city's elevation (10 m) and the cell's (46 m). Rain comes from the 0.25° cell at 0.25°, 117.50°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.