nomadseason

May Weather in Sammamish, United States

Last updated: June 24, 2025

In Sammamish, United States, the average temperature in May hovers around 13°C (56°F). Visitors can expect a range, with minimums dipping to 3°C (37°F) and maximums soaring up to 30°C (86°F). This month also brings about 94 mm (3.7 in) of precipitation over approximately 13 days, contributing to an average humidity level of 81%.

May Temperature in Sammamish

In May, in Sammamish, 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 Sammamish an ideal destination for travelers seeking mild weather and a range of outdoor activities.

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

The chart illustrates May temperature patterns in Sammamish, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sammamish, 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).
JanFebMarAprMayJunJulAugSepOctNovDec413944495560646559504540
Data source: Temperature data for Sammamish 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.

May Precipitation in Sammamish

In Sammamish in May, the precipitation amount is 94 mm (3.7 in) spread over 13 days.

May Precipitation Trends in Sammamish

The chart displays monthly precipitation patterns in Sammamish, 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 Sammamish, May typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec21524216715494883427124220239248
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Sammamish

In Sammamish in May, humidity is 81%. With an average temperature of 13°C (56°F), this humidity feels like a blanket of damp air that clings to your skin, making it essential to pack breathable clothing and stay hydrated while exploring.

May Average Humidity in Sammamish

This chart illustrates the average monthly humidity levels in Sammamish, 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 Sammamish is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Sammamish

In Sammamish 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 Sammamish.

Maximum UV Index Levels in Sammamish for May

The chart shows the monthly maximum UV Index (UVI) for Sammamish 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 Sammamish typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987522
Data source: Sammamish 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 Sammamish Compares to Other Months

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

This table compares monthly weather conditions in Sammamish, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)215 mm (8.5 inches)86%low
February Weather4°C (39°F)242 mm (9.5 inches)86%moderate
March Weather7°C (44°F)167 mm (6.6 inches)87%moderate
April Weather9°C (49°F)154 mm (6.1 inches)84%high
May Weather13°C (56°F)94 mm (3.7 inches)81%very high
June Weather16°C (60°F)88 mm (3.5 inches)82%very high
July Weather18°C (65°F)33 mm (1.3 inches)79%very high
August Weather18°C (65°F)27 mm (1.0 inches)63%very high
September Weather15°C (60°F)124 mm (4.9 inches)62%high
October Weather10°C (50°F)220 mm (8.7 inches)83%moderate
November Weather7°C (45°F)238 mm (9.4 inches)89%low
December Weather4°C (40°F)248 mm (9.8 inches)88%low

Compare Sammamish's Climate with Cities Worldwide