Climate averages 1991–2020
Sidoarjo weather
in December.
A hot, very wet month: the 8th warmest and the joint 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Sidoarjo: daytime highs average 30.2°C and nights cool to about 24.0°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 253 mm of rain on roughly 28 days, which makes December a very wet month (the joint 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 33 min on an average December day.
The nearest other city in this atlas is Bangil (20 km away). In December its highs average 29.6°C, 0.7°C cooler than Sidoarjo, with 253 mm of rain.
Among the 200 cities listed in Indonesia, Sidoarjo ranks joint 5th of 200 for the warmest December highs and joint 18th of 200 for the driest December (rainfall, lowest first). The mean December high of those 200 cities is 28.4°C; Sidoarjo is 1.8°C warmer than that mean.
From December to January, average highs fall by 0.6°C to 29.6°C, and monthly rainfall rises from 253 mm to 298 mm.
The annual picture
December 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
Sidoarjo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.6°C23.7°C | 23.7°C | 298 | 28.9 | 12.513 h |
| February | 29.5°C23.6°C | 23.6°C | 280 | 27.3 | 12.312 h |
| March | 29.8°C23.6°C | 23.6°C | 253 | 27.8 | 12.112 h |
| April | 30.1°C23.7°C | 23.7°C | 144 | 21.2 | 11.912 h |
| May | 30.9°C23.6°C | 23.6°C | 49 | 10.1 | 11.812 h |
| June | 30.9°C23.1°C | 23.1°C | 24 | 6.3 | 11.712 h |
| July | 31.2°C22.4°C | 22.4°C | 12 | 3.0 | 11.712 h |
| August | 32.1°C22.4°C | 22.4°C | 3.7 | 1.4 | 11.912 h |
| September | 33.3°C23.1°C | 23.1°C | 11 | 2.7 | 12.112 h |
| October | 33.6°C24.0°C | 24.0°C | 38 | 8.0 | 12.312 h |
| November | 32.1°C24.5°C | 24.5°C | 117 | 18.4 | 12.412 h |
| December, selected | 30.2°C24.0°C | 24.0°C | 253 | 27.5 | 12.513 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
December in nearby cities
- Bangil in DecemberIndonesia · 20 kmHigh 29.6°C · Low 23.1°C · 253 mm rain
- Surabaya in DecemberIndonesia · 22 kmHigh 29.9°C · Low 25.1°C · 274 mm rain
- Pasuruan in DecemberIndonesia · 30 kmHigh 29.1°C · Low 23.3°C · 321 mm rain
- Mojokerto in DecemberIndonesia · 31 kmHigh 30.4°C · Low 23.2°C · 447 mm rain
- Kebomas in DecemberIndonesia · 33 kmHigh 29.6°C · Low 24.4°C · 274 mm rain
- Lawang in DecemberIndonesia · 43 kmHigh 27.9°C · Low 21.6°C · 420 mm rain
- Bangkalan in DecemberIndonesia · 45 kmHigh 29.3°C · Low 25.4°C · 280 mm rain
- Singosari in DecemberIndonesia · 50 kmHigh 27.6°C · Low 21.6°C · 345 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 Sidoarjo) is explained once on the Sidoarjo year overview and on the Sources, method and limits page.
Bangil lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.