Climate averages 1991–2020
Dumai weather
in December.
A hot, very wet month: the coolest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Dumai: daytime highs average 28.7°C and nights cool to about 23.4°C. By daytime temperature it is the coolest month of the year.
Expect about 343 mm of rain on roughly 28 days, which makes December a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 02 min on an average December day.
The nearest other city in this atlas is Port Dickson (103 km away). In December its highs average 28.5°C, about as warm as Dumai, with 244 mm of rain.
Among the 200 cities listed in Indonesia, Dumai ranks joint 101st of 200 for the warmest December highs and joint 116th of 200 for the driest December (rainfall, lowest first). The mean December high of those 200 cities is 28.4°C; Dumai is 0.2°C warmer than that mean.
From December to January, average highs rise by 0.3°C to 28.9°C, and monthly rainfall falls from 343 mm to 201 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
Dumai climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.9°C23.4°C | 23.4°C | 201 | 21.3 | 12.012 h |
| February | 29.7°C23.6°C | 23.6°C | 125 | 16.9 | 12.112 h |
| March | 30.2°C23.9°C | 23.9°C | 217 | 25.1 | 12.112 h |
| April | 30.3°C24.1°C | 24.1°C | 249 | 27.6 | 12.212 h |
| May | 30.5°C24.3°C | 24.3°C | 224 | 26.3 | 12.212 h |
| June | 30.5°C24.2°C | 24.2°C | 156 | 21.2 | 12.212 h |
| July | 30.3°C23.9°C | 23.9°C | 162 | 20.4 | 12.212 h |
| August | 30.3°C23.8°C | 23.8°C | 195 | 24.0 | 12.212 h |
| September | 30.2°C23.6°C | 23.6°C | 253 | 26.1 | 12.112 h |
| October | 29.8°C23.6°C | 23.6°C | 308 | 28.2 | 12.112 h |
| November | 29.1°C23.4°C | 23.4°C | 387 | 28.5 | 12.012 h |
| December, selected | 28.7°C23.4°C | 23.4°C | 343 | 27.7 | 12.012 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
- Port Dickson in DecemberMalaysia · 103 kmHigh 28.5°C · Low 24.1°C · 244 mm rain
- Malacca in DecemberMalaysia · 106 kmHigh 28.4°C · Low 24.5°C · 218 mm rain
- Sepang in DecemberMalaysia · 119 kmHigh 28.3°C · Low 23.9°C · 262 mm rain
- Pekanbaru in DecemberIndonesia · 128 kmHigh 28.9°C · Low 22.9°C · 263 mm rain
- Seremban in DecemberMalaysia · 130 kmHigh 28.6°C · Low 23.1°C · 258 mm rain
- Muar in DecemberMalaysia · 132 kmHigh 28.3°C · Low 24.2°C · 239 mm rain
- Cyberjaya in DecemberMalaysia · 142 kmHigh 28.6°C · Low 22.7°C · 312 mm rain
- Puchong in DecemberMalaysia · 149 kmHigh 28.7°C · Low 22.9°C · 280 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 Dumai) is explained once on the Dumai year overview and on the Sources, method and limits page.