December weather forecast
Rundu, Namibia

December signals the height of the wet season in Rundu, with rainfall reaching close to its yearly maximum. A significant increase in rainfall from 44mm (1.73") in November to 69mm (2.72") shows the height of the wet season. A rise in temperatures, coupled with increasing humidity levels and declining atmospheric pressure, characterise December’s weather. Even with these changes, December weather is appealing for those who enjoy warm, wet climates. As Rundu ushers in the New Year, it also welcomes a large inflow of tourists, eager to engage in diverse outdoor activities and experience unique local traditions.

Temperature

As Rundu steps into December, the average high-temperature holds at a still tropical 31.2°C (88.2°F), hinting at a minor fluctuation from the prior month. In Rundu, an average low-temperature of 21.2°C (70.2°F) is recorded during December nights.

Heat index

For most parts of December, the heat index is estimated at a very hot 35°C (95°F). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

The average relative humidity in December is 60%.

Rainfall

In December, the rain falls for 18.6 days. Throughout December, 69mm (2.72") of precipitation is accumulated. Throughout the year, there are 89 rainfall days, and 324mm (12.76") of precipitation is accumulated.

Daylight

With an average of 13h and 12min of daylight, December has the longest days of the year.
On the first day of December, sunrise is at 05:56 and sunset at 19:03. On the last day of the month, sunrise is at 06:08 and sunset at 19:19 CAT.

Sunshine

The average sunshine in December is 10.2h.

UV index

September, October and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 7 during December leads to these instructions:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.