May Weather in Sioux Lookout, Canada

Last updated: June 18, 2025

In Sioux Lookout, Canada, the average temperature in May hovers around 10°C (50°F), but be prepared for a temperature range that can dip to -6°C (22°F) and rise all the way to 28°C (84°F). You'll experience 63 mm (2.5 in) of precipitation spread over about 9 days, while the air carries an average humidity of 75%.

May Temperature in Sioux Lookout

In May in Sioux Lookout, the average temperature is 10°C (50°F). The maximum can reach 28°C (84°F) and the minimum can be as low as -6°C (22°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your trip.

May Weather in Sioux Lookout: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Sioux Lookout, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sioux Lookout, May typically has an average temperature of 10°C (50°F), with highs reaching up to 28°C (84°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec5421324963686454402210
Data source: Temperature data for Sioux Lookout 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.

May Precipitation in Sioux Lookout

In Sioux Lookout in May, the total precipitation amount is 63 mm (2.5 in) spread over a duration of 9 days.

May Precipitation Trends in Sioux Lookout

The chart displays monthly precipitation patterns in Sioux Lookout, 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 Sioux Lookout, May typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec25302546638410486133834038
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Sioux Lookout

In Sioux Lookout in May humidity is 75%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration uncomfortable and necessitating extra layers for warmth and comfort.

May Average Humidity in Sioux Lookout

This chart illustrates the average monthly humidity levels in Sioux Lookout, 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 Sioux Lookout is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec96%96%93%90%75%66%62%67%73%82%90%96%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Sioux Lookout

In Sioux Lookout in May, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Sioux Lookout.

Maximum UV Index Levels in Sioux Lookout for May

The chart shows the monthly maximum UV Index (UVI) for Sioux Lookout 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 Sioux Lookout typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789876421
Data source: Sioux Lookout 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 Sioux Lookout Compares to Other Months

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

This table compares monthly weather conditions in Sioux Lookout, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-15°C (5°F)25 mm (1.0 inches)96%low
February Weather-15°C (4°F)30 mm (1.2 inches)96%moderate
March Weather-6°C (22°F)25 mm (1.0 inches)93%moderate
April Weather0°C (33°F)46 mm (1.8 inches)90%high
May Weather10°C (50°F)63 mm (2.5 inches)75%very high
June Weather17°C (64°F)84 mm (3.3 inches)66%very high
July Weather20°C (68°F)104 mm (4.1 inches)62%very high
August Weather18°C (65°F)86 mm (3.4 inches)67%high
September Weather12°C (54°F)133 mm (5.2 inches)73%high
October Weather5°C (41°F)82 mm (3.2 inches)82%moderate
November Weather-6°C (22°F)40 mm (1.6 inches)90%low
December Weather-12°C (10°F)38 mm (1.5 inches)96%low

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