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May Weather in Fairfield, United States

Last updated: June 24, 2025

In Fairfield, United States, the average temperature in May hovers around 20°C (68°F). You can expect lows of 4°C (40°F) and highs reaching up to 32°C (91°F). With an average humidity of 82%, the climate feels quite damp, and you'll likely experience 210 mm (8.3 in) of precipitation spread over 13 days this month. Prepare for a mix of warm days and refreshing rain!

May Temperature in Fairfield

In May in Fairfield, the average temperature is 20°C (68°F). Maximum temperatures can reach 32°C (91°F), while minimums can dip as low as 4°C (40°F). This variety in temperatures makes Fairfield an ideal destination for travelers looking to experience a mix of warm and cool weather.

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 (68°F), with highs reaching up to 32°C (91°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec394152586876797774614944
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 210 mm (8.3 in) spread over 13 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 210 mm (8.3 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec9111714416921093111148831698389
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 82%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit sluggish but surprisingly refreshing, as long as you take breaks in shaded areas to cool off.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%77%78%82%81%75%61%59%69%82%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46710111111109754
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 Weather4°C (39°F)91 mm (3.6 inches)82%moderate
February Weather5°C (42°F)116 mm (4.6 inches)79%high
March Weather11°C (53°F)144 mm (5.7 inches)77%high
April Weather14°C (58°F)169 mm (6.7 inches)78%very high
May Weather20°C (68°F)210 mm (8.3 inches)82%extreme
June Weather24°C (76°F)93 mm (3.6 inches)81%extreme
July Weather26°C (80°F)111 mm (4.4 inches)75%extreme
August Weather25°C (78°F)148 mm (5.8 inches)61%very high
September Weather23°C (74°F)83 mm (3.3 inches)59%very high
October Weather16°C (61°F)169 mm (6.7 inches)69%high
November Weather9°C (49°F)83 mm (3.3 inches)82%moderate
December Weather7°C (44°F)89 mm (3.5 inches)87%moderate

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