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May Weather in Mattawa, United States

Last updated: June 24, 2025

In Mattawa, United States, the average temperature in May is a pleasant 17°C (63°F). Expect a range that can drop to a chilly 3°C (38°F) at its lowest, while soaring to a warm 35°C (95°F) at its peak. During this time, you'll experience a total precipitation of 17 mm (0.7 in) spread over approximately 5 days, with an average humidity of 81%, creating a refreshing atmosphere.

May Temperature in Mattawa

In May in Mattawa, the average temperature is 17°C (63°F). Maximum temperatures can reach 35°C (95°F), while the minimum can drop as low as 3°C (38°F). Be prepared for a range of temperatures during your travels, from warm days to cooler evenings.

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

The chart illustrates May temperature patterns in Mattawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mattawa, May typically has an average temperature of 17°C (63°F), with highs reaching up to 35°C (95°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec313243526370777766514033
Data source: Temperature data for Mattawa 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 Mattawa

In Mattawa in May, the precipitation amount is 17 mm (0.7 in) over the course of 5 days.

May Precipitation Trends in Mattawa

The chart displays monthly precipitation patterns in Mattawa, 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 Mattawa, May typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec454328261771514333538
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Mattawa

In Mattawa in May humidity is 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.

May Average Humidity in Mattawa

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

In Mattawa 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 Mattawa.

Maximum UV Index Levels in Mattawa for May

The chart shows the monthly maximum UV Index (UVI) for Mattawa 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 Mattawa typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2356891097532
Data source: Mattawa 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 Mattawa Compares to Other Months

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

This table compares monthly weather conditions in Mattawa, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)45 mm (1.8 inches)86%low
February Weather0°C (33°F)43 mm (1.7 inches)86%moderate
March Weather6°C (43°F)27 mm (1.1 inches)87%moderate
April Weather11°C (52°F)26 mm (1.0 inches)84%high
May Weather17°C (63°F)17 mm (0.7 inches)81%very high
June Weather21°C (70°F)7 mm (0.3 inches)82%very high
July Weather25°C (77°F)1 mm (0.0 inches)79%very high
August Weather25°C (77°F)5 mm (0.2 inches)63%very high
September Weather19°C (66°F)14 mm (0.5 inches)62%high
October Weather11°C (51°F)33 mm (1.3 inches)83%moderate
November Weather4°C (40°F)35 mm (1.4 inches)89%moderate
December Weather0°C (33°F)38 mm (1.5 inches)88%low

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