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Dumai Weather by Month
Average temperatures, rainfall and humidity for Dumai, Indonesia, month by month, built from OpenWeather’s historical records. Use it to see what a typical Dumai month looks like before you travel — then check the live Dumai forecast for the days ahead.
Warmest month
June
33°C average high
Coolest month
January
23°C average low
Wettest month
April
214 mm of rain
Driest month
February
72 mm of rain
Average temperature and rainfall in Dumai by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 30°C | 23°C | 21°C / 36°C | 94 mm | 84% | 5 km/h |
| February | 31°C | 24°C | 21°C / 35°C | 72 mm | 79% | 6 km/h |
| March | 32°C | 24°C | 21°C / 36°C | 158 mm | 81% | 5 km/h |
| April | 32°C | 24°C | 22°C / 38°C | 214 mm | 84% | 4 km/h |
| May | 32°C | 24°C | 22°C / 38°C | 136 mm | 85% | 4 km/h |
| June | 33°C | 24°C | 21°C / 37°C | 79 mm | 82% | 5 km/h |
| July | 32°C | 24°C | 21°C / 36°C | 96 mm | 82% | 5 km/h |
| August | 32°C | 24°C | 21°C / 37°C | 111 mm | 84% | 5 km/h |
| September | 32°C | 24°C | 21°C / 37°C | 109 mm | 85% | 5 km/h |
| October | 31°C | 24°C | 22°C / 37°C | 124 mm | 86% | 4 km/h |
| November | 30°C | 24°C | 22°C / 35°C | 151 mm | 89% | 4 km/h |
| December | 30°C | 24°C | 21°C / 35°C | 125 mm | 88% | 5 km/h |
Best time to visit Dumai
The most comfortable time to visit Dumai is generally January to February and June, balancing mild daytime temperatures against the driest stretch of the year. Temperatures stay fairly even all year and rain concentrates around April, totalling about 1,469 mm a year.
Travellers who prefer heat should aim for June, when highs average 33°C. April is the month to avoid if rain would spoil your plans — it averages 214 mm, roughly 3× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Dumai forecast for what is happening now.