Climate averages 1991–2020
Banjarmasin weather
in September.
A hot, moderately wet month: the warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Banjarmasin: daytime highs average 31.6°C and nights cool to about 23.8°C. By daytime temperature it is the warmest month of the year.
Expect about 69 mm of rain on roughly 11 days, which makes September a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 05 min on an average September day.
The nearest other city in this atlas is Banjarbaru (30 km away). In September its highs average 31.9°C, about as warm as Banjarmasin, with 74 mm of rain.
Among the 200 cities listed in Indonesia, Banjarmasin ranks joint 49th of 200 for the warmest September highs and 97th of 200 for the driest September (rainfall, lowest first). The mean September high of those 200 cities is 30.1°C; Banjarmasin is 1.5°C warmer than that mean.
From September to October, average highs fall by 0.2°C to 31.4°C, and monthly rainfall rises from 69 mm to 152 mm.
The annual picture
September in context
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
Banjarmasin climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.3°C23.7°C | 23.7°C | 291 | 28.7 | 12.312 h |
| February | 29.6°C23.8°C | 23.8°C | 248 | 25.1 | 12.212 h |
| March | 29.7°C23.9°C | 23.9°C | 277 | 28.2 | 12.112 h |
| April | 29.9°C24.1°C | 24.1°C | 236 | 27.3 | 12.012 h |
| May | 30.1°C24.2°C | 24.2°C | 149 | 22.5 | 12.012 h |
| June | 29.7°C23.9°C | 23.9°C | 113 | 17.5 | 11.912 h |
| July | 29.7°C23.4°C | 23.4°C | 89 | 14.5 | 11.912 h |
| August | 30.8°C23.5°C | 23.5°C | 52 | 9.3 | 12.012 h |
| September, selected | 31.6°C23.8°C | 23.8°C | 69 | 10.5 | 12.112 h |
| October | 31.4°C24.0°C | 24.0°C | 152 | 18.2 | 12.212 h |
| November | 30.0°C24.0°C | 24.0°C | 254 | 27.6 | 12.312 h |
| December | 29.2°C23.8°C | 23.8°C | 328 | 29.4 | 12.312 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
September in nearby cities
- Banjarbaru in SeptemberIndonesia · 30 kmHigh 31.9°C · Low 23.0°C · 74 mm rain
- Martapura in SeptemberIndonesia · 32 kmHigh 31.8°C · Low 23.4°C · 74 mm rain
- Palangkaraya in SeptemberIndonesia · 145 kmHigh 31.9°C · Low 23.3°C · 113 mm rain
- Sampit in SeptemberIndonesia · 202 kmHigh 31.2°C · Low 23.6°C · 130 mm rain
- Pangkalanbuun in SeptemberIndonesia · 337 kmHigh 30.5°C · Low 23.8°C · 132 mm rain
- Balikpapan in SeptemberIndonesia · 338 kmHigh 28.2°C · Low 24.6°C · 109 mm rain
- Nusantara in SeptemberIndonesia · 351 kmHigh 29.9°C · Low 23.4°C · 155 mm rain
- Loa Janan in SeptemberIndonesia · 412 kmHigh 30.6°C · Low 23.6°C · 167 mm rain
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 limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Banjarmasin) is explained once on the Banjarmasin year overview and on the Sources, method and limits page.