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May Weather in Hillsborough, United States

Last updated: June 24, 2025

In May, the average temperature in Hillsborough, United States hovers around 14°C (57°F). Be prepared for a temperature range that can dip to a chilly -1°C (31°F) at its lowest and soar to a warm 32°C (91°F) at its peak. During this month, expect about 86 mm (3.4 in) of precipitation spread across 12 days, with an average humidity of 72% creating a lush, vibrant atmosphere.

May Temperature in Hillsborough

In May in Hillsborough, the average temperature is 14°C (57°F). Maximum temperatures can reach 32°C (91°F) while minimums can drop as low as -1°C (31°F). Be prepared for a wide range of temperatures to ensure a comfortable travel experience.

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

The chart illustrates May temperature patterns in Hillsborough, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hillsborough, May typically has an average temperature of 14°C (57°F), with highs reaching up to 32°C (91°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec242733455667727063513728
Data source: Temperature data for Hillsborough 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 Hillsborough

In Hillsborough in May, the precipitation amount is 86 mm (3.4 in) over a span of 12 days.

May Precipitation Trends in Hillsborough

The chart displays monthly precipitation patterns in Hillsborough, 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 Hillsborough, May typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec748881130868914010187135104120
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Hillsborough

In Hillsborough in May humidity is 72%. With an average temperature of 14°C (57°F), this humidity feels like a damp embrace, making outdoor activities slightly uncomfortable and requiring careful planning to stay hydrated and enjoy your travels.

May Average Humidity in Hillsborough

This chart illustrates the average monthly humidity levels in Hillsborough, 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 Hillsborough is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Hillsborough

In Hillsborough 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 Hillsborough.

Maximum UV Index Levels in Hillsborough for May

The chart shows the monthly maximum UV Index (UVI) for Hillsborough 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 Hillsborough typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910997632
Data source: Hillsborough 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 Hillsborough Compares to Other Months

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

This table compares monthly weather conditions in Hillsborough, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (24°F)74 mm (2.9 inches)86%moderate
February Weather-3°C (27°F)88 mm (3.5 inches)84%moderate
March Weather0°C (33°F)81 mm (3.2 inches)82%high
April Weather7°C (45°F)130 mm (5.1 inches)80%very high
May Weather14°C (57°F)86 mm (3.4 inches)72%very high
June Weather19°C (67°F)89 mm (3.5 inches)72%very high
July Weather22°C (72°F)140 mm (5.5 inches)67%very high
August Weather21°C (70°F)101 mm (4.0 inches)66%very high
September Weather17°C (63°F)87 mm (3.4 inches)71%high
October Weather11°C (52°F)135 mm (5.3 inches)78%high
November Weather3°C (37°F)104 mm (4.1 inches)84%moderate
December Weather-2°C (28°F)120 mm (4.7 inches)81%low

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