Climate averages 1991–2020
Dumai weather
in August.
A hot, very wet month: the joint 3rd warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Dumai: daytime highs average 30.3°C and nights cool to about 23.8°C. By daytime temperature it is the joint 3rd warmest of the 12 months.
Expect about 195 mm of rain on roughly 24 days, which makes August a very wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 10 min on an average August day.
The nearest other city in this atlas is Port Dickson (103 km away). In August its highs average 29.1°C, 1.2°C cooler than Dumai, with 210 mm of rain.
Among the 200 cities listed in Indonesia, Dumai ranks joint 75th of 200 for the warmest August highs and 179th of 200 for the driest August (rainfall, lowest first). The mean August high of those 200 cities is 29.5°C; Dumai is 0.8°C warmer than that mean.
From August to September, average highs fall by 0.2°C to 30.2°C, and monthly rainfall rises from 195 mm to 253 mm.
The annual picture
August 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, selected | 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
August in nearby cities
- Port Dickson in AugustMalaysia · 103 kmHigh 29.1°C · Low 24.8°C · 210 mm rain
- Malacca in AugustMalaysia · 106 kmHigh 28.7°C · Low 25.1°C · 193 mm rain
- Sepang in AugustMalaysia · 119 kmHigh 28.9°C · Low 24.6°C · 170 mm rain
- Pekanbaru in AugustIndonesia · 128 kmHigh 30.4°C · Low 23.2°C · 157 mm rain
- Seremban in AugustMalaysia · 130 kmHigh 29.1°C · Low 23.7°C · 200 mm rain
- Muar in AugustMalaysia · 132 kmHigh 28.8°C · Low 24.9°C · 185 mm rain
- Cyberjaya in AugustMalaysia · 142 kmHigh 29.6°C · Low 23.4°C · 185 mm rain
- Puchong in AugustMalaysia · 149 kmHigh 30.1°C · Low 23.6°C · 109 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.