Dumai Temperature by Month
Dumai in Sumatra, Indonesia enjoys a stable climate, with daytime temperatures staying close to 33°C (91°F) throughout the year. Explore the full monthly breakdown below.
Dumai Monthly Temperatures
The climate in Dumai remains fairly constant, offering very warm temperatures throughout the year. Maximum daytime temperatures reach a very warm 34°C (93°F) in May, dropping to a very warm 32°C (90°F) in September. Nighttime lows stay between 25°C (77°F) and 24°C (75°F).
The chart below illustrates the average maximum day and minimum night temperatures in Dumai by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: Dumai vs Indonesia
The map below shows the annual temperature across Indonesia. You can also select individual months if you want to compare a specific time of year.
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Dumai vs World: Temperature Compared
Dumai's average annual maximum temperature is 33°C (91°F). To put that in context, here's how it compares to a few well-known destinations:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
Queenstown, New Zealand averages 10°C (50°F) annually — remember seasons are flipped, so its coldest months fall in June and July.
Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Dumai's weather — including monthly rainfall, sunshine hours, and humidity — visit our Dumai climate page.
