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May Weather in Fairfield, United States

Last updated: June 24, 2025

In Fairfield, United States, the average temperature in May is a pleasant 18°C (64°F). However, temperatures can vary significantly, with minimums dipping to 0°C (33°F) and maximums soaring up to 32°C (91°F). Expect 132 mm (5.2 in) of precipitation spread over 14 days, contributing to an average humidity of 78%. Prepare accordingly for a month that blends warmth with occasional rainfall!

May Temperature in Fairfield

In May in Fairfield, the average temperature is 18°C (64°F). Maximum temperatures can reach up to 32°C (91°F), while minimums can drop as low as 0°C (33°F). Be prepared for warm days and cool nights when traveling to Fairfield this time of year.

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

The chart illustrates May temperature patterns in Fairfield, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fairfield, May typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (91°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec343743546472787569594438
Data source: Temperature data for Fairfield 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 Fairfield

In Fairfield in May, the precipitation amount is 132 mm (5.2 in) over a span of 14 days.

May Precipitation Trends in Fairfield

The chart displays monthly precipitation patterns in Fairfield, 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 Fairfield, May typically receives around 132 mm (5.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec629794981331031341191181008692
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Fairfield

In Fairfield in May, humidity is 78%. With an average temperature of 18°C (64°F), this humidity feels like a warm, thick blanket wrapping around you, making traveling feel a bit sticky and sluggish, yet the coolness of the air tempers the intensity, inviting you to explore at a leisurely pace.

May Average Humidity in Fairfield

This chart illustrates the average monthly humidity levels in Fairfield, 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 Fairfield is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%81%78%79%74%72%75%81%85%84%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Fairfield

In Fairfield 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 Fairfield.

Maximum UV Index Levels in Fairfield for May

The chart shows the monthly maximum UV Index (UVI) for Fairfield 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 Fairfield typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098743
Data source: Fairfield 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 Fairfield Compares to Other Months

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

This table compares monthly weather conditions in Fairfield, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)62 mm (2.4 inches)84%moderate
February Weather3°C (38°F)97 mm (3.8 inches)83%moderate
March Weather6°C (44°F)94 mm (3.7 inches)83%high
April Weather12°C (54°F)98 mm (3.9 inches)81%very high
May Weather18°C (64°F)132 mm (5.2 inches)78%very high
June Weather22°C (73°F)103 mm (4.1 inches)79%very high
July Weather25°C (78°F)134 mm (5.3 inches)74%very high
August Weather24°C (76°F)118 mm (4.7 inches)72%very high
September Weather21°C (70°F)118 mm (4.6 inches)75%very high
October Weather15°C (60°F)100 mm (3.9 inches)81%high
November Weather7°C (45°F)86 mm (3.4 inches)85%moderate
December Weather3°C (38°F)92 mm (3.6 inches)84%moderate

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