nomadseason

January Weather in Castletown, Ireland

Last updated: August 23, 2025

In January, the average temperature in Castletown, Ireland is a cool 6°C (43°F). Visitors can expect a brisk climate, with minimum temperatures dipping to -2°C (28°F) and peaking at 13°C (56°F). During this month, precipitation averages 53 mm (2.1 in) spread over 10 days, contributing to an average humidity of 85%. Be prepared for a mix of chilly days and occasional rain!

January Temperature in Castletown

In January in Castletown, the average temperature is 6°C (43°F). Maximum temperatures can reach 13°C (56°F), while minimums can drop as low as -2°C (28°F). Be sure to pack warm clothing when traveling during this month.

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

The chart illustrates January temperature patterns in Castletown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castletown, January typically has an average temperature of 6°C (43°F), with highs reaching up to 13°C (56°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec434344475257616057524744
Data source: Temperature data for Castletown generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Castletown

In Castletown in January, the precipitation amount is 53 mm (2.1 in) spread over a duration of 10 days.

January Precipitation Trends in Castletown

The chart displays monthly precipitation patterns in Castletown, 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 Castletown, January typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec53887955706768967693108107
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

January Humidity in Castletown

In Castletown in January, humidity is 85%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making travel feel more uncomfortable and limiting your enjoyment of the sights as you navigate the wet, brisk air.

January Average Humidity in Castletown

This chart illustrates the average monthly humidity levels in Castletown, 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 Castletown is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%85%83%85%86%85%86%87%87%84%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Castletown

In Castletown 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 Castletown.

Maximum UV Index Levels in Castletown for January

The chart shows the monthly maximum UV Index (UVI) for Castletown 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 Castletown typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Castletown 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 Castletown Compares to Other Months

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

This table compares monthly weather conditions in Castletown, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)53 mm (2.1 inches)85%low
February Weather6°C (44°F)87 mm (3.4 inches)86%low
March Weather7°C (45°F)79 mm (3.1 inches)86%moderate
April Weather8°C (47°F)55 mm (2.2 inches)85%moderate
May Weather11°C (52°F)70 mm (2.8 inches)83%high
June Weather14°C (57°F)67 mm (2.6 inches)85%very high
July Weather16°C (61°F)68 mm (2.7 inches)86%very high
August Weather15°C (60°F)96 mm (3.8 inches)85%high
September Weather14°C (57°F)76 mm (3.0 inches)86%moderate
October Weather11°C (52°F)93 mm (3.6 inches)87%moderate
November Weather8°C (47°F)108 mm (4.3 inches)86%low
December Weather7°C (44°F)107 mm (4.2 inches)84%low

Compare Castletown's Climate with Cities Worldwide