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May Weather in Upland, United States

Last updated: June 24, 2025

In Upland, United States, the average temperature in May hovers around 17°C (63°F). However, be prepared for a range of weather, as temperatures can drop to a chilly -1°C (30°F) or soar up to a warm 34°C (93°F). During this month, you can expect 133 mm (5.3 in) of precipitation spread over 15 days, with an average humidity level at a sultry 81%. Be ready for varied weather as you explore!

May Temperature in Upland

In May in Upland, the average temperature is 17°C (63°F). The maximum can reach 34°C (93°F), while the minimum can drop as low as -1°C (30°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates May temperature patterns in Upland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Upland, May typically has an average temperature of 17°C (63°F), with highs reaching up to 34°C (93°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec293241516373767368574135
Data source: Temperature data for Upland 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 Upland

In Upland in May, the precipitation amount is 133 mm (5.3 in) over a span of 15 days.

May Precipitation Trends in Upland

The chart displays monthly precipitation patterns in Upland, 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 Upland, May typically receives around 133 mm (5.3 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec768610494133106107100711018368
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Upland

In Upland in May humidity is 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.

May Average Humidity in Upland

This chart illustrates the average monthly humidity levels in Upland, 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 Upland is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Upland

In Upland 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 Upland.

Maximum UV Index Levels in Upland for May

The chart shows the monthly maximum UV Index (UVI) for Upland 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 Upland typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098642
Data source: Upland 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 Upland Compares to Other Months

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

This table compares monthly weather conditions in Upland, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)76 mm (3.0 inches)85%moderate
February Weather0°C (32°F)86 mm (3.4 inches)85%moderate
March Weather5°C (42°F)104 mm (4.1 inches)86%high
April Weather10°C (51°F)94 mm (3.7 inches)87%very high
May Weather17°C (63°F)133 mm (5.3 inches)81%very high
June Weather23°C (73°F)106 mm (4.2 inches)82%extreme
July Weather24°C (76°F)106 mm (4.2 inches)81%very high
August Weather23°C (73°F)100 mm (3.9 inches)79%very high
September Weather20°C (69°F)71 mm (2.8 inches)78%very high
October Weather14°C (57°F)101 mm (4.0 inches)81%high
November Weather5°C (41°F)83 mm (3.3 inches)89%moderate
December Weather2°C (35°F)68 mm (2.7 inches)86%low

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