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May Weather in Fairfield, United States

Last updated: June 24, 2025

In May, the average temperature in Fairfield, United States hovers around 20°C (69°F), offering a pleasant climate for both locals and visitors. However, prepare for a temperature range that can dip to a cool 2°C (36°F) or soar to a warm 34°C (93°F). Expect around 138 mm (5.4 in) of precipitation spread over 14 days, granting the region its lush greenery. With an average humidity of 80%, it’s wise to stay hydrated while enjoying the vibrant atmosphere!

May Temperature in Fairfield

In May in Fairfield, the average temperature is 20°C (69°F), with a maximum that can reach 34°C (93°F) and a minimum as low as 2°C (36°F). This is an ideal time for travelers, offering pleasant days and cool nights, perfect for exploring and enjoying the local scenery.

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 20°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec343747566877807773604440
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 total precipitation amount is 138 mm (5.4 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 138 mm (5.4 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec921061351171381148988691089992
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 80%. With an average temperature of 20°C (69°F), this humidity feels like a warm blanket enveloping you, making every step slightly more challenging as you navigate the air that clings to your skin, often leaving you longing for a cool breeze while exploring the sights.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
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 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111110109753
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)92 mm (3.6 inches)84%moderate
February Weather3°C (37°F)106 mm (4.2 inches)82%moderate
March Weather9°C (48°F)135 mm (5.3 inches)84%high
April Weather13°C (56°F)116 mm (4.6 inches)83%very high
May Weather20°C (69°F)138 mm (5.4 inches)80%extreme
June Weather25°C (77°F)114 mm (4.5 inches)83%extreme
July Weather27°C (80°F)88 mm (3.5 inches)82%very high
August Weather25°C (77°F)88 mm (3.5 inches)82%very high
September Weather23°C (73°F)69 mm (2.7 inches)79%very high
October Weather16°C (61°F)107 mm (4.2 inches)79%high
November Weather7°C (45°F)99 mm (3.9 inches)88%moderate
December Weather4°C (40°F)92 mm (3.6 inches)87%moderate

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