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May Weather in Lake Forest, United States

Last updated: June 24, 2025

In May, the average temperature in Lake Forest, United States hovers around 10°C (50°F), with a minimum of 1°C (35°F) and a maximum reaching up to 21°C (71°F). Expect a fair share of rain, with 171 mm (6.7 in) of precipitation spread over about 14 days. The air will feel quite moist, characterized by an average humidity of 78%.

May Temperature in Lake Forest

In May in Lake Forest, the average temperature is 10°C (50°F). The maximum can reach 21°C (71°F) and the minimum can be as low as 1°C (35°F). This makes it an ideal time for travelers to enjoy the mild weather while exploring the local attractions.

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

The chart illustrates May temperature patterns in Lake Forest, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lake Forest, May typically has an average temperature of 10°C (50°F), with highs reaching up to 21°C (71°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec282835415062707267554034
Data source: Temperature data for Lake Forest 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 Lake Forest

In Lake Forest in May, the precipitation amount is 171 mm (6.7 in) over the course of 14 days.

May Precipitation Trends in Lake Forest

The chart displays monthly precipitation patterns in Lake Forest, 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 Lake Forest, May typically receives around 171 mm (6.7 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec8585901251711056970851617775
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Lake Forest

In Lake Forest in May humidity is 78%. With an average temperature of 10°C (50°F), this humidity feels like a chilly dampness that can seep into your clothes, making outdoor activities less enjoyable and requiring extra layers to stay warm as you explore the area.

May Average Humidity in Lake Forest

This chart illustrates the average monthly humidity levels in Lake Forest, 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 Lake Forest is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Lake Forest

In Lake Forest 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 Lake Forest.

Maximum UV Index Levels in Lake Forest for May

The chart shows the monthly maximum UV Index (UVI) for Lake Forest 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 Lake Forest typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24689101098532
Data source: Lake Forest 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 Lake Forest Compares to Other Months

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

This table compares monthly weather conditions in Lake Forest, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)85 mm (3.3 inches)85%low
February Weather-2°C (29°F)85 mm (3.3 inches)85%moderate
March Weather2°C (36°F)90 mm (3.6 inches)85%high
April Weather5°C (41°F)125 mm (4.9 inches)85%very high
May Weather10°C (50°F)171 mm (6.7 inches)78%very high
June Weather16°C (62°F)105 mm (4.1 inches)80%very high
July Weather21°C (71°F)69 mm (2.7 inches)78%very high
August Weather22°C (72°F)70 mm (2.8 inches)76%very high
September Weather19°C (67°F)85 mm (3.4 inches)79%very high
October Weather13°C (55°F)161 mm (6.3 inches)83%moderate
November Weather5°C (41°F)77 mm (3.0 inches)88%moderate
December Weather1°C (35°F)75 mm (2.9 inches)81%low

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