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May Weather in Downey, United States

Last updated: June 24, 2025

In Downey, United States, the average temperature in May hovers around 11°C (51°F). Expect a chilly minimum of -5°C (23°F) and the possibility of a warm day peaking at 28°C (83°F). Be prepared for some rain, with an average precipitation of 60 mm (2.4 in) spread over 12 days. With an average humidity of 71%, it’s advisable to dress in layers to stay comfortable throughout the month.

May Temperature in Downey

In May in Downey, the average temperature is 11°C (51°F), with maximums reaching 28°C (83°F) and minimums dropping as low as -5°C (23°F). This weather variability makes Downey an intriguing destination for travelers, so be sure to pack layers to accommodate both warm and chilly conditions!

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

The chart illustrates May temperature patterns in Downey, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Downey, May typically has an average temperature of 11°C (51°F), with highs reaching up to 28°C (83°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec222433415163727060433322
Data source: Temperature data for Downey 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 Downey

In Downey in May, the precipitation amount is 60 mm (2.4 in) over a span of 12 days.

May Precipitation Trends in Downey

The chart displays monthly precipitation patterns in Downey, 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 Downey, May typically receives around 60 mm (2.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec597850696129142235454654
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Downey

In Downey in May, humidity is 71%. With an average temperature of 11°C (51°F), this humidity feels like a damp chill enveloping you, making outdoor exploration uncomfortable and necessitating layering to stay warm and dry.

May Average Humidity in Downey

This chart illustrates the average monthly humidity levels in Downey, 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 Downey is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%95%90%81%71%64%59%49%52%69%86%91%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Downey

In Downey 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 Downey.

Maximum UV Index Levels in Downey for May

The chart shows the monthly maximum UV Index (UVI) for Downey 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 Downey typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109643
Data source: Downey 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 Downey Compares to Other Months

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

This table compares monthly weather conditions in Downey, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)59 mm (2.3 inches)95%moderate
February Weather-4°C (25°F)78 mm (3.1 inches)95%moderate
March Weather1°C (33°F)50 mm (2.0 inches)90%very high
April Weather5°C (41°F)69 mm (2.7 inches)81%very high
May Weather11°C (51°F)60 mm (2.4 inches)71%very high
June Weather17°C (63°F)29 mm (1.1 inches)64%extreme
July Weather22°C (72°F)14 mm (0.6 inches)59%extreme
August Weather21°C (70°F)22 mm (0.9 inches)49%very high
September Weather15°C (60°F)35 mm (1.4 inches)52%very high
October Weather6°C (44°F)45 mm (1.8 inches)69%high
November Weather1°C (33°F)46 mm (1.8 inches)86%moderate
December Weather-5°C (23°F)54 mm (2.1 inches)91%moderate

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