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January Weather in Castlereagh, United Kingdom

Last updated: August 27, 2025

In January, the average temperature in Castlereagh, United Kingdom hovers around 6°C (43°F). Expect variations with a minimum of -4°C (26°F) and a maximum of 14°C (57°F). Rainy days are not uncommon, with 60 mm (2.3 in) of precipitation spread over approximately 10 days. Humidity levels are notably high, averaging at 87%, so be prepared for a moist atmosphere as you explore!

January Temperature in Castlereagh

In January in Castlereagh, the average temperature is 6°C (43°F). The maximum can reach 14°C (57°F), and the minimum can be as low as -4°C (26°F). It's advisable to pack layers to stay comfortable during your visit.

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

The chart illustrates January temperature patterns in Castlereagh, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castlereagh, January typically has an average temperature of 6°C (43°F), with highs reaching up to 14°C (57°F) and lows dropping to around -4°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec424344475257605956514744
Data source: Temperature data for Castlereagh generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Castlereagh

In Castlereagh in January, the precipitation amount is 60 mm (2.3 in) over a span of 10 days.

January Precipitation Trends in Castlereagh

The chart displays monthly precipitation patterns in Castlereagh, 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 Castlereagh, January typically receives around 60 mm (2.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6089804566788411575929491
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Castlereagh

In Castlereagh in January, humidity is 87%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and necessitating warm, breathable layers for traveling.

January Average Humidity in Castlereagh

This chart illustrates the average monthly humidity levels in Castlereagh, 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 Castlereagh is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%85%82%84%86%86%88%89%90%87%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Castlereagh

In Castlereagh in January, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Castlereagh.

Maximum UV Index Levels in Castlereagh for January

The chart shows the monthly maximum UV Index (UVI) for Castlereagh 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 Castlereagh typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578865321
Data source: Castlereagh 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 Castlereagh Compares to Other Months

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

This table compares monthly weather conditions in Castlereagh, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)60 mm (2.3 inches)87%low
February Weather6°C (43°F)89 mm (3.5 inches)86%low
March Weather7°C (44°F)80 mm (3.2 inches)86%moderate
April Weather8°C (47°F)45 mm (1.8 inches)85%moderate
May Weather11°C (52°F)66 mm (2.6 inches)82%high
June Weather14°C (57°F)78 mm (3.1 inches)84%very high
July Weather15°C (60°F)84 mm (3.3 inches)86%very high
August Weather15°C (59°F)115 mm (4.5 inches)86%high
September Weather13°C (56°F)75 mm (3.0 inches)88%moderate
October Weather11°C (52°F)92 mm (3.6 inches)89%moderate
November Weather8°C (47°F)94 mm (3.7 inches)90%low
December Weather6°C (44°F)91 mm (3.6 inches)86%low

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