Climate averages 1991–2020
Dumai weather
in January.
A hot, very wet month: the 11th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a hot month in Dumai: daytime highs average 28.9°C and nights cool to about 23.4°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 201 mm of rain on roughly 21 days, which makes January a very wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 02 min on an average January day.
The nearest other city in this atlas is Port Dickson (103 km away). In January its highs average 28.9°C, about as warm as Dumai, with 137 mm of rain.
Among the 200 cities listed in Indonesia, Dumai ranks joint 51st of 200 for the warmest January highs and 14th of 200 for the driest January (rainfall, lowest first). The mean January high of those 200 cities is 28.2°C; Dumai is 0.7°C warmer than that mean.
From January to February, average highs rise by 0.8°C to 29.7°C, and monthly rainfall falls from 201 mm to 125 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Port Dickson in JanuaryMalaysia · 103 kmHigh 28.9°C · Low 23.9°C · 137 mm rain
- Malacca in JanuaryMalaysia · 106 kmHigh 28.8°C · Low 24.2°C · 114 mm rain
- Sepang in JanuaryMalaysia · 119 kmHigh 28.6°C · Low 23.6°C · 175 mm rain
- Pekanbaru in JanuaryIndonesia · 128 kmHigh 29.0°C · Low 22.7°C · 210 mm rain
- Seremban in JanuaryMalaysia · 130 kmHigh 29.0°C · Low 22.7°C · 167 mm rain
- Muar in JanuaryMalaysia · 132 kmHigh 28.7°C · Low 24.0°C · 121 mm rain
- Cyberjaya in JanuaryMalaysia · 142 kmHigh 29.1°C · Low 22.4°C · 221 mm rain
- Puchong in JanuaryMalaysia · 149 kmHigh 29.2°C · Low 22.5°C · 200 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.