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May Weather in Cathlamet, United States

Last updated: June 24, 2025

In Cathlamet, United States, the average temperature in May is a mild 12°C (55°F). You can expect minimums of 5°C (41°F) and maximums of 27°C (82°F) throughout the month. Be prepared for some rain, as the area typically sees 74 mm (2.9 in) of precipitation over 11 days. With an average humidity level of 84%, it’s a perfect time to experience the damp charm of this locale.

May Temperature in Cathlamet

In May in Cathlamet, the average temperature is 12°C (55°F). Maximums can reach 27°C (82°F), and minimums can be as low as 5°C (41°F). This makes it an ideal time for travelers to enjoy mild weather while exploring the vibrant sights and attractions of Cathlamet.

May Weather in Cathlamet: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Cathlamet, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cathlamet, May typically has an average temperature of 12°C (55°F), with highs reaching up to 27°C (82°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec424145495459616360524641
Data source: Temperature data for Cathlamet 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 Cathlamet

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

May Precipitation Trends in Cathlamet

The chart displays monthly precipitation patterns in Cathlamet, 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 Cathlamet, May typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec2141921491347463111291151212230
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Cathlamet

In Cathlamet in May, humidity is 84%. With an average temperature of 12°C (55°F), this humidity feels like a thick blanket wrapping around you, making it a challenge for traveling as you might feel sticky and uncomfortable while exploring the sights.

May Average Humidity in Cathlamet

This chart illustrates the average monthly humidity levels in Cathlamet, 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 Cathlamet 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 Cathlamet

In Cathlamet 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 Cathlamet.

Maximum UV Index Levels in Cathlamet for May

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

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

This table compares monthly weather conditions in Cathlamet, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)214 mm (8.4 inches)86%low
February Weather5°C (41°F)192 mm (7.5 inches)84%moderate
March Weather7°C (45°F)149 mm (5.9 inches)85%moderate
April Weather10°C (50°F)134 mm (5.3 inches)83%high
May Weather12°C (55°F)74 mm (2.9 inches)84%very high
June Weather15°C (59°F)62 mm (2.5 inches)84%very high
July Weather16°C (62°F)11 mm (0.4 inches)82%very high
August Weather17°C (63°F)12 mm (0.5 inches)73%very high
September Weather16°C (60°F)91 mm (3.6 inches)74%high
October Weather11°C (52°F)151 mm (5.9 inches)83%moderate
November Weather8°C (46°F)212 mm (8.3 inches)86%moderate
December Weather5°C (41°F)229 mm (9.0 inches)87%low

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