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May Weather in Lake Forest, United States

Last updated: June 24, 2025

In Lake Forest, United States, the average temperature in May hovers around 17°C (64°F). During this time, you can expect a pleasant range, with minimum temperatures dropping to 9°C (48°F) and highs reaching up to 31°C (88°F). Precipitation is light, totaling 13 mm (0.5 in) over approximately 4 days, while the average humidity sits at a comfortable 70%. This makes for a delightful month to explore!

May Temperature in Lake Forest

In May in Lake Forest, the average temperature is 17°C (64°F). The maximum can reach 31°C (88°F) and the minimum can be as low as 9°C (48°F). This range makes it ideal for travelers seeking comfortable weather while exploring the area's 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 17°C (64°F), with highs reaching up to 31°C (88°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec565658626368737472686256
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 13 mm (0.5 in) over a span of 4 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 13 mm (0.5 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec71606827131223102574
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 70%. With an average temperature of 17°C (64°F), this humidity feels like a warm blanket wrapping around you, making traveling a bit sticky but still enjoyable as you explore the sights while staying hydrated.

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 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%79%75%71%70%72%73%69%68%67%68%71%
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 reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010754
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 Weather13°C (56°F)71 mm (2.8 inches)74%moderate
February Weather13°C (56°F)60 mm (2.3 inches)79%high
March Weather14°C (58°F)68 mm (2.7 inches)75%very high
April Weather17°C (62°F)27 mm (1.1 inches)70%very high
May Weather17°C (64°F)13 mm (0.5 inches)70%extreme
June Weather20°C (68°F)1 mm (0.0 inches)72%extreme
July Weather23°C (73°F)2 mm (0.1 inches)73%extreme
August Weather23°C (74°F)2 mm (0.1 inches)69%very high
September Weather22°C (72°F)3 mm (0.1 inches)68%very high
October Weather20°C (69°F)10 mm (0.4 inches)67%high
November Weather17°C (62°F)25 mm (1.0 inches)68%moderate
December Weather13°C (56°F)74 mm (2.9 inches)71%moderate

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