January Weather in Koster, South Africa

Last updated: August 31, 2025

In Koster, South Africa, the average temperature in January is a pleasant 23°C (74°F), with nighttime lows dipping to 13°C (56°F) and highs soaring up to 37°C (99°F). Expect about 106 mm (4.2 in) of precipitation distributed over 11 days, and enjoy an average humidity level of 66%. This combination creates a vibrant climate that’s perfect for exploring!

January Temperature in Koster

In January in Koster, the average temperature is 23°C (74°F). Maximum can reach 37°C (99°F) and minimum can be as low as 13°C (56°F). This makes it a great time for travelers to enjoy outdoor activities while being prepared for the occasional temperature fluctuation.

January Weather in Koster: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Koster, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koster, January typically has an average temperature of 23°C (74°F), with highs reaching up to 37°C (99°F) and lows dropping to around 13°C (56°F).

Data source: Temperature data for Koster generated using information from the Copernicus Climate Change Service.

January Precipitation in Koster

In Koster in January, the precipitation amount is 106 mm (4.2 in) spread over a duration of 11 days.

January Precipitation Trends in Koster

The chart displays monthly precipitation patterns in Koster, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Koster, January typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Koster

In Koster in January humidity is 66%. With an average temperature of 23°C (74°F), this humidity feels like a warm embrace, making outdoor activities slightly uncomfortable but still enjoyable for travelers who are properly hydrated and prepared for the moist conditions.

January Average Humidity in Koster

This chart illustrates the average monthly humidity levels in Koster, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Koster is approximately 66%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Koster

In Koster in January, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in Koster.

Maximum UV Index Levels in Koster for January

The chart shows the monthly maximum UV Index (UVI) for Koster in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Koster typically reaches 16, which falls under the extreme exposure category.

Data source: Koster January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How January Weather in Koster Compares to Other Months

Weather in Koster varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Koster, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Koster, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	23°C (74°F)	106 mm (4.2 inches)	66%	extreme
February Weather	22°C (72°F)	128 mm (5.0 inches)	66%	extreme
March Weather	21°C (70°F)	53 mm (2.1 inches)	67%	extreme
April Weather	18°C (65°F)	43 mm (1.7 inches)	61%	extreme
May Weather	15°C (59°F)	9 mm (0.4 inches)	56%	high
June Weather	12°C (55°F)	5 mm (0.2 inches)	56%	high
July Weather	12°C (54°F)	2 mm (0.1 inches)	55%	high
August Weather	16°C (61°F)	1 mm (0.1 inches)	45%	very high
September Weather	20°C (68°F)	5 mm (0.2 inches)	49%	extreme
October Weather	21°C (71°F)	47 mm (1.9 inches)	47%	extreme
November Weather	23°C (73°F)	67 mm (2.7 inches)	53%	extreme
December Weather	23°C (73°F)	120 mm (4.7 inches)	64%	extreme