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April Weather in Saint John, United States

Last updated: June 24, 2025

In April, the average temperature in Saint John, United States hovers around 9°C (48°F). This month can bring a chilly minimum of -6°C (21°F), while the mercury can rise to a pleasant 28°C (82°F). Expect 119 mm (4.7 in) of rainfall over approximately 13 days, contributing to a relatively high average humidity of 85%.

April Temperature in Saint John

In April in Saint John, the average temperature is 9°C (48°F). Maximum temperatures can reach 28°C (82°F), while minima can drop as low as -6°C (21°F). Travelers should be prepared for a wide range of temperatures and dress accordingly.

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

The chart illustrates April 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, April typically has an average temperature of 9°C (48°F), with highs reaching up to 28°C (82°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec272939486071757368554034
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.

April Precipitation in Saint John

In Saint John in April, the precipitation amount is 119 mm (4.7 in) spread over 13 days.

April Precipitation Trends in Saint John

The chart displays monthly precipitation patterns in Saint John, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Saint John, April typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec70719911916213010392741426960
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Saint John

In Saint John in April humidity is 85%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay warm and comfortable while traveling.

April Average Humidity in Saint John

This chart illustrates the average monthly humidity levels in Saint John, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Saint John is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Saint John

In Saint John in April, 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 Saint John.

Maximum UV Index Levels in Saint John for April

The chart shows the monthly maximum UV Index (UVI) for Saint John in April, 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 April, the maximum UV index in Saint John typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Saint John April 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 April 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 April’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 April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)70 mm (2.7 inches)82%moderate
February Weather-2°C (29°F)71 mm (2.8 inches)83%moderate
March Weather4°C (39°F)99 mm (3.9 inches)84%high
April Weather9°C (48°F)119 mm (4.7 inches)85%very high
May Weather16°C (60°F)162 mm (6.4 inches)79%very high
June Weather22°C (71°F)130 mm (5.1 inches)82%very high
July Weather24°C (75°F)103 mm (4.1 inches)80%very high
August Weather23°C (73°F)92 mm (3.6 inches)81%very high
September Weather20°C (68°F)74 mm (2.9 inches)80%very high
October Weather13°C (56°F)142 mm (5.6 inches)82%high
November Weather5°C (40°F)68 mm (2.7 inches)88%moderate
December Weather1°C (34°F)60 mm (2.4 inches)84%low

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