May weather forecast
Thunder Bay, Canada

May is the beginning of the warm season in Thunder Bay, with temperatures steadily climbing. However, the wettest period begins with rainfall peaking at 66mm (2.6"). The extended hours of daylight promote growth in the city's gardens, parks, and forests. The weather invites locals and tourists alike to take part in outdoor activities, enjoying the greener cityscape.

Temperature

May brings a rise in Thunder Bay's average high-temperature, moving from a chilly 9.2°C (48.6°F) in April to a refreshing 16.2°C (61.2°F). The nighttime temperature shows a significant divergence from the daytime highs, averaging at a wintry 2.2°C (36°F) in May.

Rainfall

In Thunder Bay, in May, during 11 rainfall days, 66mm (2.6") of precipitation is typically accumulated. In Thunder Bay, Canada, during the entire year, the rain falls for 92.6 days and collects up to 547mm (21.54") of precipitation.

Snowfall

January through May, September through December are months with snowfall in Thunder Bay. May is the last month it regularly snows in Thunder Bay. During 0.5 snowfall days, in May, Thunder Bay aggregates 10mm (0.39") of snow. In Thunder Bay, during the entire year, snow falls for 62.7 days and aggregates up to 1631mm (64.21") of snow.

Sea temperature

In May, the average sea temperature is 3°C (37.4°F).
Note: During swimming, this state is an instant threat to life. Breathing is uncontrollable, and coherent thought processes nearly vanish. A specialized swimsuit is crucial to minimize thermal dissipation.

Daylight

In May, the average length of the day in Thunder Bay is 15h and 15min.
On the first day of May in Thunder Bay, sunrise is at 6:36 am and sunset at 9:11 pm. On the last day of the month, sunrise is at 6:00 am and sunset at 9:49 pm EDT.

Sunshine

The average sunshine in May in Thunder Bay is 8.4h.

UV index

The average daily maximum UV index in May in Thunder Bay is 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In May, the UV index of 6 transforms into the following advice:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Stay sun-safe with clothing that is both closely woven and worn loosely. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.