May weather forecastSt. John's, Canada

Weather in May

The merry month of May welcomes the summer season to St. John's, displaying landscapes drenched with sunlight. The high temperature reaches up to 11.1°C (52°F), and the low temperature up to 1.7°C (35.1°F), making this the first month of the year with no sub-zero temperatures. With extended daylight, dress codes change to lighter fabrics, and streets become abuzz with activities. Frequent rain showers maintain the lush greenery of the city. Despite rains, the city remains infused with the warmth of summer.

Temperature

As St. John's transitions into May, a rise in the average high-temperature is observed, moving from a wintry 5.6°C (42.1°F) in April to a cool 11.1°C (52°F). St. John's witnesses an average low-temperature of 1.7°C (35.1°F) throughout the month of May.

Rainfall

In May, in St. John's, Canada, the rain falls for 15.9 days. Throughout May, 98mm (3.86") of precipitation is accumulated. Throughout the year, in St. John's, there are 162.7 rainfall days, and 1207mm (47.52") of precipitation is accumulated.

Snowfall

January through June, October through December are months with snowfall in St. John's. In St. John's, in May, during 2.1 snowfall days, 44mm (1.73") of snow is typically accumulated. Throughout the year, in St. John's, there are 79 snowfall days, and 3349mm (131.85") of snow is accumulated.

Sea temperature

In St. John's, Canada, the average seawater temperature in May is 2.5°C (36.5°F).
Note: While swimming, this is deemed life-threatening and exceptionally hazardous. The icy water induces intense pain and causes swift hyperventilation. Employing a specialized swimsuit is required to offset thermal harm.

Daylight

The average length of the day in May in St. John's is 15h and 9min.
On the first day of the month, sunrise is at 5:42 am and sunset at 8:13 pm. On the last day of May, in St. John's, sunrise is at 5:07 am and sunset at 8:49 pm NDT.

Sunshine

In St. John's, the average sunshine in May is 5.7h.

UV index

In May, the average daily maximum UV index in St. John's is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: The daily high UV index of 6 in May translates into this advice:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.