May Weather in Saint Johns, United States

Last updated: June 24, 2025

In Saint Johns, United States, the average temperature in May is a pleasant 18°C (64°F). You can expect temperatures to range from a chilly 0°C (31°F) to a warm 33°C (91°F). During this time, precipitation averages around 9 mm (0.4 in), typically over 2 days, while the average humidity sits comfortably at 48%.

May Temperature in Saint Johns

In May in Saint Johns, the average temperature is 18°C (64°F). The maximum can reach 33°C (91°F), while the minimum can drop as low as 0°C (31°F). Be sure to pack clothing for both warm days and cooler nights when traveling during this time.

May Weather in Saint Johns: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Saint Johns, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Johns, May typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 0°C (31°F).

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

May Precipitation in Saint Johns

In Saint Johns in May, the precipitation amount is 9 mm (0.4 in) over the course of 2 days.

May Precipitation Trends in Saint Johns

The chart displays monthly precipitation patterns in Saint Johns, 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 Saint Johns, May typically receives around 9 mm (0.4 inches) of precipitation spread over approximately 2 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 Saint Johns

In Saint Johns in May humidity is 48%. With an average temperature of 18°C (64°F), this humidity feels like a refreshing embrace, ideal for exploring the sights without feeling too sticky or uncomfortable.

May Average Humidity in Saint Johns

This chart illustrates the average monthly humidity levels in Saint Johns, 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 Saint Johns is approximately 48%, 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 Saint Johns

In Saint Johns in May, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Saint Johns.

Maximum UV Index Levels in Saint Johns for May

The chart shows the monthly maximum UV Index (UVI) for Saint Johns 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 Saint Johns typically reaches 12, which falls under the extreme exposure category.

Data source: Saint Johns 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 Saint Johns Compares to Other Months

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

This table compares monthly weather conditions in Saint Johns, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	25 mm (1.0 inches)	81%	moderate
February Weather	4°C (40°F)	29 mm (1.1 inches)	83%	high
March Weather	9°C (48°F)	21 mm (0.8 inches)	71%	very high
April Weather	14°C (57°F)	13 mm (0.5 inches)	61%	extreme
May Weather	18°C (64°F)	9 mm (0.4 inches)	48%	extreme
June Weather	24°C (76°F)	6 mm (0.3 inches)	36%	extreme
July Weather	25°C (77°F)	32 mm (1.3 inches)	37%	extreme
August Weather	24°C (76°F)	19 mm (0.8 inches)	46%	extreme
September Weather	21°C (69°F)	19 mm (0.8 inches)	62%	extreme
October Weather	14°C (57°F)	17 mm (0.7 inches)	74%	very high
November Weather	8°C (47°F)	12 mm (0.5 inches)	82%	high
December Weather	3°C (37°F)	19 mm (0.8 inches)	82%	moderate