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May Weather in Monrovia, United States

Last updated: June 24, 2025

In May, the average temperature in Monrovia, United States hovers around 18°C (65°F). However, be prepared for a range of extremes—the minimum can dip to -1°C (30°F), while the maximum can soar to 34°C (93°F). Expect some wet days, as the precipitation averages 131 mm (5.2 in) over 15 days, with an average humidity of 79%.

May Temperature in Monrovia

In May in Monrovia, the average temperature is 18°C (65°F). The maximum can reach 34°C (93°F), and the minimum can be as low as -1°C (30°F). This wide temperature range makes Monrovia an ideal destination for travelers seeking both warm days and cool nights.

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

The chart illustrates May temperature patterns in Monrovia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monrovia, May typically has an average temperature of 18°C (65°F), with highs reaching up to 34°C (93°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec313443526473777470584237
Data source: Temperature data for Monrovia 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 Monrovia

In Monrovia in May, the precipitation amount is 131 mm (5.2 in) over a span of 15 days.

May Precipitation Trends in Monrovia

The chart displays monthly precipitation patterns in Monrovia, 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 Monrovia, May typically receives around 131 mm (5.2 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec8696129102131121108107741009888
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Monrovia

In Monrovia in May, humidity is 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.

May Average Humidity in Monrovia

This chart illustrates the average monthly humidity levels in Monrovia, 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 Monrovia is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Monrovia

In Monrovia 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 Monrovia.

Maximum UV Index Levels in Monrovia for May

The chart shows the monthly maximum UV Index (UVI) for Monrovia 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 Monrovia typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098643
Data source: Monrovia 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 Monrovia Compares to Other Months

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

This table compares monthly weather conditions in Monrovia, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)86 mm (3.4 inches)87%moderate
February Weather1°C (34°F)96 mm (3.8 inches)85%moderate
March Weather6°C (43°F)129 mm (5.1 inches)86%high
April Weather11°C (53°F)102 mm (4.0 inches)84%very high
May Weather18°C (65°F)131 mm (5.2 inches)79%very high
June Weather23°C (74°F)121 mm (4.8 inches)82%extreme
July Weather25°C (77°F)108 mm (4.3 inches)79%very high
August Weather23°C (74°F)107 mm (4.2 inches)70%very high
September Weather21°C (70°F)74 mm (2.9 inches)69%very high
October Weather14°C (58°F)100 mm (3.9 inches)76%high
November Weather5°C (42°F)98 mm (3.8 inches)88%moderate
December Weather3°C (37°F)88 mm (3.5 inches)87%moderate

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