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May Weather in Tumwater, United States

Last updated: June 24, 2025

In May, the average temperature in Tumwater, United States is a pleasant 13°C (56°F). Visitors can expect a minimum of 4°C (40°F) and a maximum of 29°C (85°F), allowing for a diverse range of outdoor activities. However, be prepared for some rain, as precipitation averages 65 mm (2.6 in) over 9 days, contributing to an average humidity level of 84%.

May Temperature in Tumwater

In May in Tumwater, the average temperature is 13°C (56°F), with maximums reaching up to 29°C (85°F) and minimums dropping as low as 4°C (40°F). This diverse climate makes it an ideal time for travelers to enjoy a variety of outdoor activities while dressing in layers to stay comfortable.

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

The chart illustrates May temperature patterns in Tumwater, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tumwater, May typically has an average temperature of 13°C (56°F), with highs reaching up to 29°C (85°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec424145505661656661524641
Data source: Temperature data for Tumwater 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 Tumwater

In Tumwater in May, the precipitation amount is 65 mm (2.6 in) over the course of 9 days.

May Precipitation Trends in Tumwater

The chart displays monthly precipitation patterns in Tumwater, 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 Tumwater, May typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec197155134117655191288134192203
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Tumwater

In Tumwater 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 Tumwater

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

In Tumwater in May, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Tumwater.

Maximum UV Index Levels in Tumwater for May

The chart shows the monthly maximum UV Index (UVI) for Tumwater 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 Tumwater typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987532
Data source: Tumwater 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 Tumwater Compares to Other Months

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

This table compares monthly weather conditions in Tumwater, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)197 mm (7.8 inches)86%low
February Weather5°C (41°F)155 mm (6.1 inches)84%moderate
March Weather7°C (45°F)134 mm (5.3 inches)85%moderate
April Weather10°C (50°F)117 mm (4.6 inches)83%high
May Weather13°C (56°F)65 mm (2.6 inches)84%very high
June Weather16°C (61°F)51 mm (2.0 inches)84%very high
July Weather18°C (65°F)9 mm (0.4 inches)82%very high
August Weather19°C (66°F)12 mm (0.5 inches)73%very high
September Weather16°C (61°F)88 mm (3.5 inches)74%high
October Weather11°C (52°F)133 mm (5.3 inches)83%moderate
November Weather8°C (46°F)192 mm (7.5 inches)86%moderate
December Weather5°C (42°F)203 mm (8.0 inches)87%low

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