May weather forecast
Dumai, Indonesia

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Weather in May

The last month of the spring, May, is also a hot month in Dumai, Indonesia, with an average temperature ranging between max 32.5°C (90.5°F) and min 24.7°C (76.5°F).

Temperature

The shift into May uncovers an average high-temperature of a still hot 32.5°C (90.5°F), subtly different from the previous month. An average low-temperature of 24.7°C (76.5°F) is recorded during the nights in May.

Heat index

The average heat index in May is appraised at a burning hot 47°C (116.6°F). Mindful: Heat cramps and heat exhaustion are to be expected. Extended physical effort might result in heatstroke.
Be aware that heat index ratings are designed for shaded locations and minor breezes. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

The average relative humidity in May is 81%.

Rainfall

In Dumai, during May, the rain falls for 25.9 days and regularly aggregates up to 119mm (4.69") of precipitation. Throughout the year, there are 286.4 rainfall days, and 1200mm (47.24") of precipitation is accumulated.

Sea temperature

The months with the warmest seawater in Dumai are May and June, with an average sea temperature of 30.2°C (86.4°F).
Note: When the water's temperature hits more than 30°C (86°F), it arguably becomes less enjoyable for cooling down.

Daylight

In May, the average length of the day is 12h and 12min.
On the first day of the month, sunrise is at 06:06 and sunset at 18:16. On the last day of May, sunrise is at 06:05 and sunset at 18:18 WIB.

Sunshine

The average sunshine in May is 8.3h.

UV index

January through September and November, with an average maximum UV index of 7, are months with the highest UV index in Dumai, Indonesia. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: During May, 7 as the daily maximum UV index converts into the following advice:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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Frequently asked questions

How hot is it in Dumai in May?

Dumai in May has an average high-temperature of 32.5°C (90.5°F) and an average low-temperature of 24.7°C (76.5°F). In May, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is appraised at 47°C (116.6°F).

What is the average humidity in May in Dumai?

The average relative humidity in May in Dumai is 81%.

How much does it rain in Dumai in May?

In Dumai, during May, the rain falls for 25.9 days and regularly aggregates up to 119mm (4.69") of precipitation.

When is the sea warmest in Dumai?

May and June, with an average sea temperature of 30.2°C (86.4°F), are months with the warmest seawater.

What is the sea water temperature in May in Dumai?

In Dumai, the average seawater temperature in May is 30.2°C (86.4°F). For swimming, other intense water activities, temperature above 30°C (86°F) is arguably unpleasant, as the water cooling effect is missing.

What is the average length of the day in May in Dumai?

The average day length in May is 12h and 12min.

When is the sunrise / sunset in May in Dumai?

In May, on the first day of the month, sunrise is at 06:06 and sunset at 18:16. On the last day of the month, in Dumai, sunrise is at 06:05 and sunset at 18:18 WIB.

How many hours of sunshine does Dumai have in May?

The average sunshine duration in May in Dumai, Indonesia, is 8.3h.

What is the month with the highest UV index in Dumai?

January through September and November, with an average maximum UV index of 7, are months with the highest UV index in Dumai.

How high is the UV index in May in Dumai?

The average daily maximum UV index in May in Dumai, Indonesia, is 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Dumai, Indonesia

Average temperature in May - Dumai, Indonesia
  • Average high temperature in May: 32.5°C

The warmest month (with the highest average high temperature) is June (32.8°C).
The months with the lowest average high temperature are January and December (30.6°C).

  • Average low temperature in May: 24.7°C

The month with the highest average low temperature is May (24.7°C).
The coldest month (with the lowest average low temperature) is December (23.7°C).

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Average pressure in May
Dumai, Indonesia

Average pressure in May - Dumai, Indonesia
  • Average pressure in May: 1008.8mbar

The months with the highest atmospheric pressure are January and February (1010.3mbar).
The month with the lowest atmospheric pressure is May (1008.8mbar).

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Average wind speed in May
Dumai, Indonesia

Average wind speed in May - Dumai, Indonesia
  • Average wind speed in May: 4.6km/h

The windiest month (with the highest average wind speed) is February (5.8km/h).
The calmest month (with the lowest average wind speed) is April (4.5km/h).

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Average humidity in May
Dumai, Indonesia

Average humidity in May - Dumai, Indonesia
  • Average humidity in May: 81%

The months with the highest relative humidity are November and December (83%).
The month with the lowest relative humidity is February (78%).

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Average rainfall in May
Dumai, Indonesia

Average rainfall in May - Dumai, Indonesia
  • Average rainfall in May: 119mm

The wettest month (with the highest rainfall) is October (142mm).
The driest month (with the least rainfall) is February (52mm).

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Average rainfall days in May
Dumai, Indonesia

Average rainfall days in May - Dumai, Indonesia
  • Average rainfall days in May: 25.9 days

The month with the highest number of rainy days is November (26.4 days).
The month with the least rainy days is February (18.7 days).

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Average sea temperature in May
Dumai, Indonesia

Average sea temperature in May - Dumai, Indonesia
  • Average sea temperature in May: 30.2°C

The best months for swimming (with the highest average sea temperature) are May and June (30.2°C).
The coldest month (with the lowest average sea temperature) is January (28.4°C).

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Average daylight in May /
Average sunshine in May
Dumai, Indonesia

Average daylight in May / Average sunshine in May - Dumai, Indonesia
  • Average daylight in May: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 12min).
The month with the shortest days is December (Average daylight: 12h and 0min).

  • Average sunshine in May: 8h and 2min

The month with the most sunshine is October (Average sunshine: 8h and 48min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).

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Average sunshine days in May
Dumai, Indonesia

Average sunshine days in May - Dumai, Indonesia
  • Average sunshine days in May: 3.9 days

The month with the most sunshine days is June (7.2 days).
The month with the least sunshine days is November (3 days).

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Average UV index in May
Dumai, Indonesia

Average UV index in May - Dumai, Indonesia
  • Average UV index in May: 7

The months with the highest UV index are January, February, March, April, May, June, July, August, September and November (UV index 7).
The months with the lowest UV index are October and December (UV index 6).

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Average cloud cover in May
Dumai, Indonesia

Average cloud cover in May - Dumai, Indonesia
  • Average cloud cover in May: 41

The month with the most cloud cover is November (Cloud cover 54).
The months with the least cloud cover are February and June (Cloud cover 39).

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Average visibility in May
Dumai, Indonesia

Average visibility in May - Dumai, Indonesia
  • Average visibility in May: 9km

The months with the highest visibility are January, February, March, April, May, June, July, August, September and October (9km).
The months with the lowest visibility are November and December (8km).

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Dumai, Indonesia

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