May Weather in Ilwaco, United States

Last updated: June 24, 2025

In May, the average temperature in Ilwaco, United States hovers around 12°C (54°F), making it a pleasant time to explore. Expect minimums of 7°C (45°F) and highs reaching 21°C (69°F). However, be prepared for some rain, as precipitation averages around 66 mm (2.6 in) over 11 days, contributing to a high average humidity of 84%.

May Temperature in Ilwaco

In May in Ilwaco, the average temperature is 12°C (54°F). Maximum temperatures can reach 21°C (69°F), while minimums can drop to as low as 7°C (45°F). This mild weather makes Ilwaco an ideal destination for travelers looking to enjoy pleasant outdoor activities during this time.

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

The chart illustrates May temperature patterns in Ilwaco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ilwaco, May typically has an average temperature of 12°C (54°F), with highs reaching up to 21°C (69°F) and lows dropping to around 7°C (45°F).

Data source: Temperature data for Ilwaco generated using information from the Copernicus Climate Change Service.

May Precipitation in Ilwaco

In Ilwaco in May, the precipitation amount is 66 mm (2.6 in) spread over 11 days.

May Precipitation Trends in Ilwaco

The chart displays monthly precipitation patterns in Ilwaco, 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 Ilwaco, May typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Ilwaco

In Ilwaco in May, humidity is 84%. With an average temperature of 12°C (54°F), this humidity feels like a damp blanket enveloping you, making travel uncomfortable and sticky.

May Average Humidity in Ilwaco

This chart illustrates the average monthly humidity levels in Ilwaco, 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 Ilwaco is approximately 84%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Ilwaco

In Ilwaco 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 Ilwaco.

Maximum UV Index Levels in Ilwaco for May

The chart shows the monthly maximum UV Index (UVI) for Ilwaco 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 Ilwaco typically reaches 9, which falls under the very high exposure category.

Data source: Ilwaco 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 Ilwaco Compares to Other Months

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

This table compares monthly weather conditions in Ilwaco, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (47°F)	242 mm (9.5 inches)	86%	low
February Weather	7°C (45°F)	193 mm (7.6 inches)	84%	moderate
March Weather	8°C (47°F)	161 mm (6.3 inches)	85%	moderate
April Weather	10°C (50°F)	132 mm (5.2 inches)	83%	high
May Weather	12°C (54°F)	66 mm (2.6 inches)	84%	very high
June Weather	14°C (58°F)	58 mm (2.3 inches)	84%	very high
July Weather	15°C (60°F)	19 mm (0.8 inches)	82%	very high
August Weather	16°C (61°F)	20 mm (0.8 inches)	73%	very high
September Weather	15°C (60°F)	84 mm (3.3 inches)	74%	high
October Weather	13°C (55°F)	156 mm (6.1 inches)	83%	moderate
November Weather	10°C (51°F)	249 mm (9.8 inches)	86%	moderate
December Weather	8°C (47°F)	248 mm (9.8 inches)	87%	low