Dumai Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Dumai, Sumatra, Indonesia. These values are calculated using 30 years of data (1990–2020) to ensure accuracy. Now, let's explore all the details to give you a full picture.

Dumai has a notably wet climate with abundant precipitation, recording 2917 mm (115 in) of rainfall per year.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

The climate in Dumai shows significant variation throughout the year. Expect 384 mm (15 in) of precipitation during the wettest month November, distributed over 23 rainy days.

In contrast, February offers drier and sunnier days, with around 151 mm (5.9 in) of rainfall over 13 rainy days.

November, the wettest month, has a maximum daytime temperature of 32°C (90°F). During the driest month February you can expect a temperature of 33°C (91°F). For more detailed insights into the city's temperatures, visit our Dumai Temperature page.

Dumai's average annual precipitation is 2917 mm (115 in). Let's compare this to some popular worldwide tourist destinations:

The city of Rome, Italy, has an average annual precipitation of 832 mm (33 in), spread fairly evenly throughout the year.

Beijing, China, receives 560 mm (22 in) of annual precipitation, concentrated in the summer months.

Melbourne, Australia, has 690 mm (27 in) of rainfall annually, spread fairly evenly throughout the year.

Singapore, situated near the equator, gets 2581 mm (102 in) of rainfall annually, with no distinct dry season and consistent monthly precipitation.

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

The proximity of a location to a large body of water can significantly affect its rainfall patterns:

• Ocean Influence: Coastal regions typically receive more rainfall due to the presence of moisture-laden winds from the ocean. These regions tend to have more humid climates and experience more frequent precipitation, especially in winter.
• Continental Climates: Areas further from the sea, such as inland or continental regions, experience less frequent rainfall and more extreme seasonal variations in precipitation.

• The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
• Approximately 70% of lightning bolts strike land rather than oceans.
• A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.

For more detailed information about Dumai's weather, including sunshine hours, humidity levels, and temperature data, visit our Dumai Climate page.