May Weather in Astoria, United States

Last updated: June 24, 2025

In Astoria, United States, the average temperature in May hovers around 18°C (65°F). However, be prepared for a wide range in temperatures, with minimums dipping to 0°C (33°F) and maximums soaring up to 36°C (97°F). Expect approximately 164 mm (6.5 in) of precipitation spread across 16 days, and enjoy the humid atmosphere with an average humidity level of 78%.

May Temperature in Astoria

In May in Astoria, the average temperature is 18°C (65°F). Maximums can reach 36°C (97°F), and minimums can be as low as 0°C (33°F). This diverse temperature range makes Astoria an ideal destination for travelers seeking both warm and cool weather experiences.

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

The chart illustrates May temperature patterns in Astoria, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Astoria, May typically has an average temperature of 18°C (65°F), with highs reaching up to 36°C (97°F) and lows dropping to around 0°C (33°F).

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

May Precipitation in Astoria

In Astoria in May, the total precipitation amount is 164 mm (6.5 in), spread over 16 days.

May Precipitation Trends in Astoria

The chart displays monthly precipitation patterns in Astoria, 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 Astoria, May typically receives around 164 mm (6.5 inches) of precipitation spread over approximately 16 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 Astoria

In Astoria in May, humidity is 78%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket, making travel quite muggy and potentially uncomfortable, as it can leave you feeling sticky and fatigued more quickly than usual.

May Average Humidity in Astoria

This chart illustrates the average monthly humidity levels in Astoria, 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 Astoria is approximately 78%, 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 Astoria

In Astoria in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Astoria.

Maximum UV Index Levels in Astoria for May

The chart shows the monthly maximum UV Index (UVI) for Astoria 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 Astoria typically reaches 10, which falls under the very high exposure category.

Data source: Astoria 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 Astoria Compares to Other Months

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

This table compares monthly weather conditions in Astoria, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	62 mm (2.4 inches)	81%	moderate
February Weather	-1°C (31°F)	66 mm (2.6 inches)	81%	moderate
March Weather	6°C (43°F)	127 mm (5.0 inches)	81%	high
April Weather	11°C (52°F)	110 mm (4.3 inches)	82%	very high
May Weather	18°C (65°F)	164 mm (6.5 inches)	78%	very high
June Weather	24°C (75°F)	135 mm (5.3 inches)	81%	extreme
July Weather	25°C (78°F)	103 mm (4.0 inches)	79%	very high
August Weather	24°C (75°F)	89 mm (3.5 inches)	77%	very high
September Weather	21°C (71°F)	71 mm (2.8 inches)	78%	very high
October Weather	14°C (57°F)	108 mm (4.3 inches)	78%	high
November Weather	5°C (41°F)	59 mm (2.3 inches)	87%	moderate
December Weather	2°C (35°F)	51 mm (2.0 inches)	84%	low