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June Weather in Thunder Bay, Canada

Last updated: June 18, 2025

In June, the average temperature in Thunder Bay, Canada is a mild 14°C (58°F). Expect a temperature range with minimums dropping to 1°C (35°F) and highs reaching up to 28°C (83°F). Visitors should be prepared for some rain, as 58 mm (2.3 in) of precipitation is expected over 11 days. The average humidity during this time is a moderate 71%, adding to the character of the season.

June Temperature in Thunder Bay

In June in Thunder Bay, the average temperature is 14°C (58°F). Maximums can reach 28°C (83°F), while minimums can drop as low as 1°C (35°F). Be sure to pack layers to enjoy the fluctuating weather during your travels.

June Weather in Thunder Bay: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Thunder Bay, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Thunder Bay, June typically has an average temperature of 14°C (58°F), with highs reaching up to 28°C (83°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec9923334758666355432716
Data source: Temperature data for Thunder Bay generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

June Precipitation in Thunder Bay

In Thunder Bay in June, the precipitation amount is 58 mm (2.3 in) over the course of 11 days.

June Precipitation Trends in Thunder Bay

The chart displays monthly precipitation patterns in Thunder Bay, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Thunder Bay, June typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec303531585258827798875255
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Thunder Bay

In Thunder Bay in June humidity is 71%. With an average temperature of 14°C (58°F), this humidity feels like a damp embrace, making it essential for travelers to pack light, breathable clothing and stay hydrated while exploring the sights.

June Average Humidity in Thunder Bay

This chart illustrates the average monthly humidity levels in Thunder Bay, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Thunder Bay is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%94%92%90%79%71%70%72%76%82%87%94%
Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in Thunder Bay

In Thunder Bay in June, 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 Thunder Bay.

Maximum UV Index Levels in Thunder Bay for June

The chart shows the monthly maximum UV Index (UVI) for Thunder Bay in June, 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 June, the maximum UV index in Thunder Bay typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789887421
Data source: Thunder Bay June 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 June Weather in Thunder Bay Compares to Other Months

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

This table compares monthly weather conditions in Thunder Bay, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-13°C (9°F)30 mm (1.2 inches)95%low
February Weather-13°C (9°F)35 mm (1.4 inches)94%moderate
March Weather-5°C (23°F)31 mm (1.2 inches)92%moderate
April Weather1°C (33°F)58 mm (2.3 inches)90%high
May Weather8°C (47°F)52 mm (2.0 inches)78%very high
June Weather14°C (58°F)58 mm (2.3 inches)71%very high
July Weather19°C (66°F)82 mm (3.2 inches)70%very high
August Weather17°C (63°F)77 mm (3.0 inches)72%very high
September Weather13°C (55°F)98 mm (3.9 inches)76%high
October Weather6°C (43°F)87 mm (3.4 inches)82%moderate
November Weather-3°C (27°F)51 mm (2.0 inches)87%low
December Weather-9°C (16°F)55 mm (2.2 inches)94%low

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