December weather forecast and climate
Semarang, Indonesia

Weather in December

The first month of the summer, December, is also a moderately hot month in Semarang, Indonesia, with average temperature fluctuating between 21.6°C (70.9°F) and 27°C (80.6°F).

Temperature

In December, the average high-temperature is almost the same as in November - a still warm 27°C (80.6°F). In Semarang, in December, the average low-temperature is 21.6°C (70.9°F).

Heat index

The average heat index is appraised at a tropical 30.2°C (86.4°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'apparent temperature', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, metabolic differences, pregnancy), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in December is 85%.

Rainfall

In Semarang, during December, the rain falls for 28.5 days and regularly aggregates up to 356mm (14.02") of precipitation. Throughout the year, in Semarang, there are 305 rainfall days, and 2988mm (117.64") of precipitation is accumulated.

Sea temperature

December is the month with the warmest seawater in Semarang, with an average sea temperature of 30.3°C (86.5°F).
Note: The surface water temperatures above 30°C (86°F) are arguably considered as unpleasant for swimming, and any intense water activity, as the refreshing effect of water is missing.

Daylight

Months with the longest days are January and December, with an average of 12.5h of daylight.

Sunshine

With an average of 6.7h of sunshine, December has the least sunshine of the year.

UV index

Months with the highest UV index in Semarang are January through December, with an average maximum UV index of 6. January through December, with an average maximum UV index of 6, are months with the lowest UV index in Semarang. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 6 in December transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Semarang?

In December, the average high-temperature is 27°C (80.6°F), and the average low-temperature is 21.6°C (70.9°F). In December, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, is appraised at 30.2°C (86.4°F).

What is the average humidity in December in Semarang?

In December, the average relative humidity in Semarang is 85%.

How much does it rain in Semarang in December?

In Semarang, in December, during 28.5 rainfall days, 356mm (14.02") of precipitation is typically accumulated.

When is the sea warmest in Semarang?

December is the month with the warmest seawater in Semarang, Indonesia, with an average sea temperature of 30.3°C (86.5°F).

How warm is the water in December in Semarang?

In Semarang, Indonesia, in December, the average water temperature is 30.3°C (86.5°F). The water temperature above 30°C (86°F) is arguably regarded as unpleasant. The primary purpose of entering the water - cooling down from sunshine and high temperatures - is lost.

When are the longest days in Semarang?

Months with the longest days are January and December, with an average of 12.5h of daylight.

What is the average length of the day in December in Semarang?

In December, the average length of the day in Semarang is 12.5h.

What is the month with the least sunshine in Semarang?

With an average of 6.7h of sunshine, December has the least sunshine of the year in Semarang.

How long on average sun shines in December in Semarang?

In December, the average sunshine in Semarang is 6.7h.

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

January through December, with an average maximum UV index of 6, are months with the highest UV index in Semarang.

When is the lowest UV index in Semarang?

Months with the lowest UV index in Semarang are January through December, with an average maximum UV index of 6.

What is the UV index reading in December in Semarang?

The average daily maximum UV index in December is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays.

Average temperature in December
Semarang, Indonesia

Average temperature in December - Semarang, Indonesia
  • Average high temperature in December: 27°C

The warmest month (with the highest average high temperature) is October (27.9°C).
The month with the lowest average high temperature is July (26.7°C).

  • Average low temperature in December: 21.6°C

Months with the highest average low temperature are January and December (21.6°C).
The coldest month (with the lowest average low temperature) is August (19.4°C).

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Average pressure in December
Semarang, Indonesia

Average pressure in December - Semarang, Indonesia
  • Average pressure in December: 1009.1mbar

Months with the highest atmospheric pressure are August and September (1011.6mbar).
The month with the lowest atmospheric pressure is December (1009.1mbar).

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Average wind speed in December
Semarang, Indonesia

Average wind speed in December - Semarang, Indonesia
  • Average wind speed in December: 4.9km/h

The windiest months (with the highest average wind speed) are January, July, August and September (5.9km/h).
The calmest month (with the lowest average wind speed) is April (3.7km/h).

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Average humidity in December
Semarang, Indonesia

Average humidity in December - Semarang, Indonesia
  • Average humidity in December: 85%

Months with the highest relative humidity are February, April and May (86%).
The month with the lowest relative humidity is September (81%).

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Average rainfall in December
Semarang, Indonesia

Average rainfall in December - Semarang, Indonesia
  • Average rainfall in December: 356mm

The wettest month (with the highest rainfall) is March (404mm).
The driest month (with the least rainfall) is August (43mm).

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Average rainfall days in December
Semarang, Indonesia

Average rainfall days in December - Semarang, Indonesia
  • Average rainfall days in December: 28.5 days

The month with the highest number of rainy days is January (30.1 days).
The month with the least rainy days is August (15.8 days).

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Average sea temperature in December
Semarang, Indonesia

Average sea temperature in December - Semarang, Indonesia
  • Average sea temperature in December: 30.3°C

The best month for swimming (with the highest average sea temperature) is December (30.3°C).
The coldest month (with the lowest average sea temperature) is August (28°C).

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Average daylight in December /
Average sunshine in December
Semarang, Indonesia

Average daylight in December / Average sunshine in December - Semarang, Indonesia
  • Average daylight in December: 12.5h

Months with the longest days are January and December (Average daylight: 12.5h).
The month with the shortest days is June (Average daylight: 11.7h).

  • Average sunshine in December: 6.7h

The month with the most sunshine is August (Average sunshine: 8.6h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in December
Semarang, Indonesia

Average sunshine days in December - Semarang, Indonesia
  • Average sunshine days in December: 1.3 days

The month with the most sunshine days is August (11.3 days).
The month with the least sunshine days is February (0.2 days).

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Average UV index in December
Semarang, Indonesia

Average UV index in December - Semarang, Indonesia
  • Average UV index in December: 6

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

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Average cloud cover in December
Semarang, Indonesia

Average cloud cover in December - Semarang, Indonesia
  • Average cloud cover in December: 54

The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 36).

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Average visibility in December
Semarang, Indonesia

Average visibility in December - Semarang, Indonesia
  • Average visibility in December: 8km

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

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