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June Weather in Mercer Island, United States

Last updated: June 24, 2025

In Mercer Island, United States, the average temperature in June hovers around 17°C (62°F). Expect a minimum of 8°C (46°F) and a maximum of 38°C (101°F), offering a broad range for weather enthusiasts. The region experiences 63 mm (2.5 in) of precipitation over 9 days, resulting in an average humidity level of 82%—perfect for those who enjoy a lush, vibrant atmosphere.

June Temperature in Mercer Island

In June, in Mercer Island, the average temperature is 17°C (62°F). The maximum can reach 38°C (101°F) and the minimum can be as low as 8°C (46°F). This makes it essential for travelers to pack a variety of clothing to accommodate the warm days and cooler evenings.

June Weather in Mercer Island: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Mercer Island, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mercer Island, June typically has an average temperature of 17°C (62°F), with highs reaching up to 38°C (101°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec424145505762666762524742
Data source: Temperature data for Mercer Island 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.

June Precipitation in Mercer Island

In Mercer Island in June, the total precipitation amount is 63 mm (2.5 in) spread over a duration of 9 days.

June Precipitation Trends in Mercer Island

The chart displays monthly precipitation patterns in Mercer Island, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Mercer Island, June typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec17517712611768631916100155181196
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Mercer Island

In Mercer Island in June, humidity is 82%. With an average temperature of 17°C (62°F), this humidity feels like a thick blanket enveloping you, making every step feel heavier and the air thicker, which can be quite exhausting for traveling.

June Average Humidity in Mercer Island

This chart illustrates the average monthly humidity levels in Mercer Island, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Mercer Island is approximately 82%, 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 June generated using information from the Copernicus Climate Change Service.

June UV Index in Mercer Island

In Mercer Island in June, 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 Mercer Island.

Maximum UV Index Levels in Mercer Island for June

The chart shows the monthly maximum UV Index (UVI) for Mercer Island in June, 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 June, the maximum UV index in Mercer Island typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987521
Data source: Mercer Island June 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 June Weather in Mercer Island Compares to Other Months

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

This table compares monthly weather conditions in Mercer Island, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)175 mm (6.9 inches)86%low
February Weather5°C (41°F)177 mm (7.0 inches)86%moderate
March Weather7°C (46°F)126 mm (4.9 inches)87%moderate
April Weather10°C (50°F)117 mm (4.6 inches)84%high
May Weather14°C (57°F)68 mm (2.7 inches)81%very high
June Weather17°C (62°F)63 mm (2.5 inches)82%very high
July Weather19°C (67°F)18 mm (0.7 inches)79%very high
August Weather19°C (67°F)16 mm (0.6 inches)63%very high
September Weather16°C (62°F)100 mm (3.9 inches)62%high
October Weather11°C (52°F)155 mm (6.1 inches)83%moderate
November Weather8°C (47°F)181 mm (7.1 inches)89%low
December Weather6°C (42°F)196 mm (7.7 inches)88%low

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