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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 12°C (54°F). While you may experience chilly lows of -8°C (17°F), the days can warm up to a cozy 33°C (92°F). Expect about 50 mm (2.0 in) of precipitation spread over 7 rainy days, with an average humidity of 70% adding a touch of moisture to the air.

April Temperature in Saint John

In April in Saint John, the average temperature is 12°C (54°F). The maximum can reach 33°C (92°F) and the minimum can be as low as -8°C (17°F). This significant temperature variation makes Saint John an ideal destination for travelers seeking both warm days and crisp, cool evenings.

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 12°C (54°F), with highs reaching up to 33°C (92°F) and lows dropping to around -8°C (17°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.

April Precipitation in Saint John

In Saint John in April, the precipitation amount is 50 mm (2.0 in) over a span of 7 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 50 mm (2.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec2621685016862587462812432
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 70%. With an average temperature of 12°C (54°F), this humidity feels like a chilly embrace, making it essential for travelers to wear layers while exploring the area, as the dampness can seep through clothing, leaving one feeling cooler than the actual temperature suggests.

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 70%, 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 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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4579101111109753
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 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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