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June Weather in Saint John, United States

Last updated: June 24, 2025

In June, the average temperature in Saint John, United States hovers around 25°C (77°F), making it a delightful time to explore. Visitors can expect a minimum temperature of 10°C (50°F) and the occasional peak at 38°C (100°F). With an average precipitation of 62 mm (2.4 in) spread over 9 days, it's wise to prepare for some rain. Furthermore, the average humidity of 82% adds a touch of tropical warmth to the atmosphere.

June Temperature in Saint John

In June in Saint John, the average temperature is 25°C (77°F), with maximums reaching up to 38°C (100°F) and minimums dropping as low as 10°C (50°F). It’s an ideal time to travel to Saint John if you enjoy warm weather and are prepared for some temperature variations.

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 25°C (77°F), with highs reaching up to 38°C (100°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec323346546577817873564537
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 precipitation amount is 62 mm (2.4 in) over the course of 9 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 62 mm (2.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec2621685016862587462812432
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 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 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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%76%67%70%82%82%81%76%67%72%80%83%
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 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 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4579101111109753
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 Weather0°C (33°F)25 mm (1.0 inches)75%moderate
February Weather1°C (34°F)21 mm (0.8 inches)76%moderate
March Weather8°C (47°F)68 mm (2.7 inches)67%high
April Weather12°C (54°F)50 mm (2.0 inches)70%very high
May Weather18°C (65°F)168 mm (6.6 inches)82%very high
June Weather25°C (77°F)62 mm (2.4 inches)82%extreme
July Weather27°C (81°F)58 mm (2.3 inches)81%extreme
August Weather25°C (78°F)74 mm (2.9 inches)76%very high
September Weather23°C (73°F)62 mm (2.4 inches)67%very high
October Weather14°C (57°F)81 mm (3.2 inches)72%high
November Weather7°C (45°F)24 mm (0.9 inches)80%moderate
December Weather3°C (37°F)32 mm (1.3 inches)83%moderate

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