May Weather in Fairfield, United States

Last updated: June 24, 2025

In Fairfield, United States, the average temperature in May hovers around 18°C (64°F), with a minimum dipping to 1°C (34°F) and soaring up to a maximum of 36°C (98°F). Expect a substantial precipitation of 160 mm (6.3 in) over approximately 15 days, accompanied by an average humidity level of 78%.

May Temperature in Fairfield

In May in Fairfield, the average temperature is 18°C (64°F). Maximums can reach 36°C (98°F) and minimums can be as low as 1°C (34°F). Be prepared for a diverse range of weather conditions while exploring the area!

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 36°C (98°F) and lows dropping to around 1°C (34°F).

Data source: Temperature data for Fairfield generated using information from the Copernicus Climate Change Service.

May Precipitation in Fairfield

In Fairfield in May, the precipitation amount is 160 mm (6.3 in) over the course of 15 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 160 mm (6.3 inches) of precipitation spread over approximately 15 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

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.

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 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 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 9, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	52 mm (2.0 inches)	81%	moderate
February Weather	-3°C (27°F)	55 mm (2.2 inches)	81%	moderate
March Weather	5°C (42°F)	91 mm (3.6 inches)	81%	high
April Weather	10°C (51°F)	83 mm (3.3 inches)	82%	very high
May Weather	18°C (64°F)	160 mm (6.3 inches)	78%	very high
June Weather	24°C (75°F)	133 mm (5.2 inches)	81%	extreme
July Weather	25°C (78°F)	70 mm (2.8 inches)	79%	very high
August Weather	24°C (75°F)	73 mm (2.9 inches)	77%	very high
September Weather	21°C (69°F)	121 mm (4.8 inches)	78%	very high
October Weather	12°C (54°F)	124 mm (4.9 inches)	78%	high
November Weather	4°C (40°F)	52 mm (2.0 inches)	87%	moderate
December Weather	0°C (33°F)	43 mm (1.7 inches)	84%	moderate