Dumai climate
Dumai (Indonesia) has a tropical rainforest climate (Köppen Af). The average temperature over the year is 26 °C79 °F, and about 2,592 mm102 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Dumai climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2883 | 2374 | 2678 | 1907.5 |
| Feb | 2984 | 2374 | 2679 | 1325.2 |
| Mar | 2984 | 2475 | 2680 | 2258.9 |
| Apr | 2985 | 2475 | 2780 | 25410 |
| May | 2985 | 2476 | 2780 | 1977.7 |
| Jun | 2984 | 2475 | 2679 | 1716.7 |
| Jul | 2984 | 2374 | 2679 | 1777.0 |
| Aug | 2984 | 2374 | 2679 | 1977.8 |
| Sep | 2984 | 2374 | 2679 | 2108.3 |
| Oct | 2984 | 2474 | 2679 | 26610 |
| Nov | 2883 | 2474 | 2679 | 30612 |
| Dec | 2883 | 2374 | 2678 | 26610 |
| Year | 2985 | 2374 | 2679 | 2,592102 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 90% | 84% | 4.4 | 12:02 |
| Feb | 89% | 78% | 4.9 | 12:04 |
| Mar | 90% | 82% | 4.9 | 12:06 |
| Apr | 91% | 86% | 4.8 | 12:09 |
| May | 91% | 86% | 4.7 | 12:12 |
| Jun | 91% | 82% | 4.6 | 12:13 |
| Jul | 90% | 81% | 4.6 | 12:12 |
| Aug | 90% | 83% | 4.7 | 12:10 |
| Sep | 90% | 88% | 4.5 | 12:07 |
| Oct | 90% | 91% | 4.5 | 12:05 |
| Nov | 92% | 93% | 4.4 | 12:02 |
| Dec | 92% | 91% | 4.2 | 12:02 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Dumai is like
The warmest month is May, with an average high of 29 °C85 °F and a low of 24 °C76 °F. The coldest is January, when highs average 28 °C83 °F and lows 23 °C74 °F. Temperatures barely change through the year: the warmest and the coolest month differ by only 1.1 °C2 °F.
It is very wet, receiving about 2,592 mm102 in of precipitation per year. The wettest three-month stretch is October–December, which brings 32% of the annual total. The wettest month is November (306 mm12 in), the driest is February (132 mm5.2 in).
Relative humidity ranges from 89% in February to 92% in December. The clearest skies (lowest average cloud amount, 78%) are typical of February. Average wind speed near the ground ranges from 1 km/h (0 mph) in October to 1 km/h (1 mph) in February.
Best time to visit Dumai
No month comes close to our comfort ideal here. The least demanding months are February, June and July (average highs 29 °C84 °F, 29 °C84 °F and 29 °C84 °F).
The most challenging month is November, which is very wet (306 mm12 in) and humid (92% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Dumai
- Wetter months (March and April, October–December) — highs 2883 to 29 °C85 °F, lows 2374 to 24 °C75 °F, about 263 mm10 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (January and February, May–September) — highs 2883 to 29 °C85 °F, lows 2374 to 24 °C76 °F, about 182 mm7.2 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
How Dumai compares
Compared with Malacca, about 106 km to the northeast, Dumai is on average 1.4 °C2.5 °F cooler and receives 16% more precipitation (2,592 mm102 in vs 2,236 mm88 in). The difference is largest in June (1.9 °C3.3 °F cooler).
Of the 110 places in Indonesia covered by World Climates, Dumai is the 84th warmest by annual mean temperature and the 32nd wettest by annual precipitation. See all of them on the Indonesia climate page.
Places in other countries with the most similar temperature and rainfall pattern: Kuala Lumpur (Malaysia, Af), Selayang Baru Utara (Malaysia, Af) and Kajang (Malaysia, Af).
Nearby places
- Malacca 106 km · 28 °C82 °F · 2,236 mm88 in
- Pekanbaru 128 km · 26 °C79 °F · 2,860 mm113 in
- Seremban 130 km · 27 °C81 °F · 2,406 mm95 in
- Kajang 152 km · 27 °C80 °F · 2,521 mm99 in
- Kampung Baru Subang 165 km · 28 °C82 °F · 2,629 mm104 in
- Kuala Lumpur 166 km · 27 °C80 °F · 2,521 mm99 in
- Batu Pahat 167 km · 27 °C80 °F · 2,300 mm91 in
- Selayang Baru Utara 178 km · 27 °C80 °F · 2,556 mm101 in
Frequently asked questions
What is the warmest month in Dumai?
May is the warmest month in Dumai, with an average high of 29 °C (85 °F) and an average low of 24 °C (76 °F).
What is the coldest month in Dumai?
January is the coldest month, with an average high of 28 °C (83 °F) and an average low of 23 °C (74 °F).
When does it rain the most in Dumai?
November is the wettest month with about 306 mm (12.0 in) of precipitation; February is the driest with about 132 mm (5.2 in).
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.