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May Weather in Castle Rock, United States

Last updated: June 24, 2025

In Castle Rock, United States, the average temperature in May hovers around 13°C (56°F), offering a pleasant climate. Temperatures can fluctuate significantly, with a minimum of 3°C (37°F) and a maximum of 30°C (86°F). Expect some rain, as precipitation averages 74 mm (2.9 in) over 11 days, contributing to a high average humidity of 84%. Ideal for those who enjoy a refreshing atmosphere!

May Temperature in Castle Rock

In May, in Castle Rock, the average temperature is 13°C (56°F). Maximum temperatures can reach 30°C (86°F), while minimums can drop as low as 3°C (37°F). This makes Castle Rock an ideal destination for travelers seeking mild weather and a range of outdoor activities.

May Weather in Castle Rock: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Castle Rock, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castle Rock, May typically has an average temperature of 13°C (56°F), with highs reaching up to 30°C (86°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec414045505560646661504540
Data source: Temperature data for Castle Rock 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.

May Precipitation in Castle Rock

In Castle Rock in May, the precipitation amount is 74 mm (2.9 in) spread over the course of 11 days.

May Precipitation Trends in Castle Rock

The chart displays monthly precipitation patterns in Castle Rock, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Castle Rock, May typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec1901751501257459101084133179202
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Castle Rock

In Castle Rock in May, humidity is 84%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making it feel cooler and more uncomfortable for traveling, as the air clings to your skin and weighs you down with a sense of heaviness.

May Average Humidity in Castle Rock

This chart illustrates the average monthly humidity levels in Castle Rock, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Castle Rock is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%85%83%84%84%82%73%74%83%86%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Castle Rock

In Castle Rock in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Castle Rock.

Maximum UV Index Levels in Castle Rock for May

The chart shows the monthly maximum UV Index (UVI) for Castle Rock in May, 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 May, the maximum UV index in Castle Rock typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2356910987532
Data source: Castle Rock May 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 May Weather in Castle Rock Compares to Other Months

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

This table compares monthly weather conditions in Castle Rock, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)190 mm (7.5 inches)86%low
February Weather4°C (40°F)175 mm (6.9 inches)84%moderate
March Weather7°C (45°F)150 mm (5.9 inches)85%moderate
April Weather10°C (50°F)125 mm (4.9 inches)83%high
May Weather13°C (56°F)74 mm (2.9 inches)84%very high
June Weather16°C (61°F)59 mm (2.3 inches)84%very high
July Weather18°C (65°F)10 mm (0.4 inches)82%very high
August Weather19°C (66°F)10 mm (0.4 inches)73%very high
September Weather16°C (61°F)84 mm (3.3 inches)74%high
October Weather10°C (51°F)132 mm (5.2 inches)83%moderate
November Weather7°C (45°F)179 mm (7.0 inches)86%moderate
December Weather4°C (40°F)202 mm (8.0 inches)87%low

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