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May Weather in Forest Grove, United States

Last updated: June 24, 2025

In May, the average temperature in Forest Grove, United States is a pleasant 14°C (58°F). However, temperatures can vary dramatically, with a minimum of 2°C (36°F) and a maximum soaring to 32°C (89°F). Expect about 55 mm (2.2 in) of precipitation spread over 9 days, alongside an average humidity level of 83%, creating a unique and often humid climate during this time.

May Temperature in Forest Grove

In May in Forest Grove, the average temperature is 14°C (58°F). The maximum can reach 32°C (89°F) and the minimum can be as low as 2°C (36°F). It's an ideal time for travelers to experience a range of weather, so pack accordingly!

May Weather in Forest Grove: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Forest Grove, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Forest Grove, May typically has an average temperature of 14°C (58°F), with highs reaching up to 32°C (89°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec414145515763687063534641
Data source: Temperature data for Forest Grove 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 Forest Grove

In Forest Grove in May, the precipitation amount is 55 mm (2.2 in) over a span of 9 days.

May Precipitation Trends in Forest Grove

The chart displays monthly precipitation patterns in Forest Grove, 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 Forest Grove, May typically receives around 55 mm (2.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec17316613211555476666101163188
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Forest Grove

In Forest Grove in May, humidity is 83%. With an average temperature of 14°C (58°F), this humidity feels like a thick blanket enveloping you, making exploration feel heavier and sweatier, so be prepared for a slower pace while traveling.

May Average Humidity in Forest Grove

This chart illustrates the average monthly humidity levels in Forest Grove, 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 Forest Grove is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Forest Grove

In Forest Grove 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 Forest Grove.

Maximum UV Index Levels in Forest Grove for May

The chart shows the monthly maximum UV Index (UVI) for Forest Grove 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 Forest Grove typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23579101087532
Data source: Forest Grove 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 Forest Grove Compares to Other Months

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

This table compares monthly weather conditions in Forest Grove, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)173 mm (6.8 inches)85%low
February Weather5°C (41°F)166 mm (6.5 inches)84%moderate
March Weather7°C (46°F)132 mm (5.2 inches)85%moderate
April Weather10°C (51°F)115 mm (4.5 inches)83%high
May Weather14°C (58°F)55 mm (2.2 inches)83%very high
June Weather17°C (64°F)47 mm (1.9 inches)83%very high
July Weather20°C (69°F)5 mm (0.2 inches)82%very high
August Weather21°C (70°F)6 mm (0.2 inches)74%very high
September Weather17°C (64°F)66 mm (2.6 inches)71%high
October Weather11°C (53°F)101 mm (4.0 inches)81%moderate
November Weather8°C (46°F)163 mm (6.4 inches)87%moderate
December Weather5°C (41°F)188 mm (7.4 inches)87%low

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