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June Weather in Saint John, United States

Last updated: June 24, 2025

In Saint John, United States, the average temperature in June hovers around 20°C (68°F), with a minimum of 7°C (44°F) and a maximum reaching up to 44°C (111°F). Expect about 20 mm (0.8 in) of precipitation spread over 4 days, and enjoy a comfortable average humidity level of 79%.

June Temperature in Saint John

In June in Saint John, the average temperature is 20°C (68°F). Maximums can reach up to 44°C (111°F), while minimums can drop as low as 7°C (44°F). Be prepared for a wide range of temperatures when traveling to Saint John during this month.

June Weather in Saint John: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Saint John, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint John, June typically has an average temperature of 20°C (68°F), with highs reaching up to 44°C (111°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec343442495967767564504134
Data source: Temperature data for Saint John 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 Saint John

In Saint John in June, the total precipitation amount is 20 mm (0.8 in) spread over a period of 4 days.

June Precipitation Trends in Saint John

The chart displays monthly precipitation patterns in Saint John, 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 Saint John, June typically receives around 20 mm (0.8 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec62745648452021022547471
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Saint John

In Saint John in June humidity is 79%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that clings to the skin, making outdoor activities feel more strenuous and prompting the need for frequent breaks and hydration while traveling.

June Average Humidity in Saint John

This chart illustrates the average monthly humidity levels in Saint John, 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 Saint John is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%82%77%79%77%62%60%80%87%86%
Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in Saint John

In Saint John 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 Saint John.

Maximum UV Index Levels in Saint John for June

The chart shows the monthly maximum UV Index (UVI) for Saint John 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 Saint John typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2456891097532
Data source: Saint John 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 Saint John Compares to Other Months

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

This table compares monthly weather conditions in Saint John, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)62 mm (2.5 inches)85%low
February Weather1°C (34°F)74 mm (2.9 inches)86%moderate
March Weather6°C (42°F)56 mm (2.2 inches)86%moderate
April Weather10°C (50°F)48 mm (1.9 inches)82%high
May Weather15°C (59°F)45 mm (1.8 inches)77%very high
June Weather20°C (68°F)20 mm (0.8 inches)79%very high
July Weather24°C (76°F)2 mm (0.1 inches)77%very high
August Weather24°C (75°F)10 mm (0.4 inches)62%very high
September Weather18°C (64°F)22 mm (0.9 inches)60%high
October Weather10°C (50°F)54 mm (2.1 inches)80%moderate
November Weather5°C (41°F)74 mm (2.9 inches)87%moderate
December Weather1°C (34°F)70 mm (2.8 inches)86%low

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