nomadseason

August Weather in Saint John, United States

Last updated: June 24, 2025

The average temperature in Saint John, United States during August is a pleasant 24°C (75°F). However, be prepared for temperature swings, as it can drop to a minimum of 8°C (47°F) or soar to a maximum of 40°C (104°F). Rainfall is light, with an average precipitation of only 10 mm (0.4 in) over the course of 2 days. With an average humidity of 62%, it’s essential to stay hydrated and enjoy the mild climate!

August Temperature in Saint John

In August in Saint John, the average temperature is 24°C (75°F). The maximum can reach 40°C (104°F) and the minimum can be as low as 8°C (47°F). Travelers should be prepared for warm days and cooler evenings when visiting during this time.

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

The chart illustrates August 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, August typically has an average temperature of 24°C (75°F), with highs reaching up to 40°C (104°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec343442495967767564504134
Data source: Temperature data for Saint John generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Saint John

In Saint John in August, the precipitation amount is 10 mm (0.4 in) over a period of 2 days.

August Precipitation Trends in Saint John

The chart displays monthly precipitation patterns in Saint John, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Saint John, August typically receives around 10 mm (0.4 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec62745648452021022547471
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

August Humidity in Saint John

In Saint John in August, humidity is 62%. With an average temperature of 24°C (75°F), this humidity feels like a warm embrace, making for a sticky yet comfortable travel experience that invites you to explore but may require occasional breaks to rehydrate and cool down.

August Average Humidity in Saint John

This chart illustrates the average monthly humidity levels in Saint John, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Saint John is approximately 62%, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in Saint John

In Saint John in August, 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 August

The chart shows the monthly maximum UV Index (UVI) for Saint John in August, 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 August, the maximum UV index in Saint John typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2456891097532
Data source: Saint John August 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 August 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 August’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 August’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

Compare Saint John's Climate with Cities Worldwide