May weather forecast and climate
St. John's, Canada

What is the temperature in May in St. John's?

In May, in St. John's, the average high-temperature is 11.1°C (52°F), and the average low-temperature is 1.7°C (35.1°F).

How much does it rain in St. John's in May?

In St. John's, in May, during 15.9 rainfall days, 97.9mm (3.9") of precipitation is typically accumulated.

How many days does it snow in May in St. John's?

In St. John's, during May, snow falls for 2.1 days and regularly aggregates up to 44mm (1.7") of snow.

How cold is the water in May in St. John's?

In May, the average sea temperature in St. John's, Canada, is 2.5°C (36.5°F). For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

What is the average UV index in May in St. John's?

In May, the average UV index is 6.
Average temperature in May - St. John
  • Average high temperature in May: 11.1°C

The warmest month (with the highest average high temperature) is July (20.7°C).
The month with the lowest average high temperature is February (-1.1°C).

  • Average low temperature in May: 1.7°C

The month with the highest average low temperature is August (11.6°C).
The coldest month (with the lowest average low temperature) is February (-8.6°C).

Average rainfall in May - St. John
  • Average rainfall in May: 97.9mm

The wettest month (with the highest rainfall) is October (153.7mm).
The driest month (with the lowest rainfall) is February (61.6mm).

Average rainfall days in May - St. John
  • Average rainfall days in May: 15.9 days

The month with the highest number of rainy days is October (18.1 days).
The month with the lowest number of rainy days is February (8.6 days).

Average snowfall in May - St. John
  • Average snowfall in May: 44mm

The month with the highest snowfall is January (887mm).
Months with the lowest snowfall are July, August and September (0mm).

Average snowfall days in May - St. John
  • Average snowfall days in May: 2.1 days

The month with the highest number of snowfall days is January (18.3 days).
Months with the lowest number of snowfall days are July, August and September (0 days).

Average sea temperature in May - St. John
  • Average sea temperature in May: 2.5°C

The best month for swimming (with the highest average sea temperature) is August (13.9°C).
The coldest month (with the lowest average sea temperature) is March (-0.4°C).

Average daylight in May / Average sunshine in May - St. John
  • Average daylight in May: 15.1h

The month with the longest days is June (Average daylight: 15.9h).
The month with shortest days is December (Average daylight: 8.5h).

  • Average sunshine in May: 5.7h

The month with most sunshine is July (Average sunshine: 7h).
The month with least sunshine is December (Average sunshine: 2h).

Average UV index in May - St. John
  • Average UV index in May: 6

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).

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