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June Weather in Ottawa, United States

Last updated: June 24, 2025

In Ottawa, United States, the average temperature in June hovers around 25°C (77°F). Be prepared for a temperature range that can dip as low as 11°C (51°F) and soar to a sweltering 37°C (99°F). During this month, you can expect 109 mm (4.3 in) of precipitation across 9 days, contributing to an average humidity level of 82%.

June Temperature in Ottawa

In June in Ottawa, the average temperature is 25°C (77°F), with maximums reaching 37°C (99°F) and minimums dipping as low as 11°C (51°F). This range makes Ottawa an ideal destination for travelers looking to enjoy warm weather while still having the option to experience cooler evenings.

June Weather in Ottawa: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Ottawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ottawa, June typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (99°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec333447556677807772584539
Data source: Temperature data for Ottawa 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 Ottawa

In Ottawa in June, the total precipitation amount is 109 mm (4.3 in) spread over 9 days.

June Precipitation Trends in Ottawa

The chart displays monthly precipitation patterns in Ottawa, 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 Ottawa, June typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec56369996196109112120811154133
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Ottawa

In Ottawa in June, humidity is 82%. With an average temperature of 25°C (77°F), this humidity feels like a warm, oppressive blanket enveloping you as you explore, making every step feel more laborious and prompting the need for frequent hydration breaks.

June Average Humidity in Ottawa

This chart illustrates the average monthly humidity levels in Ottawa, 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 Ottawa is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in Ottawa

In Ottawa in June, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Ottawa.

Maximum UV Index Levels in Ottawa for June

The chart shows the monthly maximum UV Index (UVI) for Ottawa 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 Ottawa typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679101111109743
Data source: Ottawa 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 Ottawa Compares to Other Months

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

This table compares monthly weather conditions in Ottawa, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)56 mm (2.2 inches)76%moderate
February Weather1°C (34°F)36 mm (1.4 inches)77%high
March Weather9°C (48°F)98 mm (3.9 inches)70%high
April Weather13°C (55°F)96 mm (3.8 inches)73%very high
May Weather19°C (66°F)196 mm (7.7 inches)82%very high
June Weather25°C (77°F)109 mm (4.3 inches)82%extreme
July Weather27°C (80°F)112 mm (4.4 inches)81%extreme
August Weather25°C (77°F)120 mm (4.7 inches)78%very high
September Weather22°C (73°F)81 mm (3.2 inches)71%very high
October Weather14°C (58°F)115 mm (4.5 inches)71%high
November Weather7°C (45°F)41 mm (1.6 inches)81%moderate
December Weather4°C (39°F)33 mm (1.3 inches)84%moderate

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