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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 10°C (50°F). Expect a range from a chilly -4°C (24°F) to a warm 29°C (85°F). With an average precipitation of 48 mm (1.9 in) spread across 10 days, it’s a good idea to pack an umbrella! Additionally, you’ll experience high humidity levels at 82%, making the air feel quite moist.

April Temperature in Saint John

In April in Saint John, the average temperature is 10°C (50°F). The maximum can reach 29°C (85°F) and the minimum can be as low as -4°C (24°F). Be prepared for a wide range of temperatures if you plan to visit during this time.

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 10°C (50°F), with highs reaching up to 29°C (85°F) and lows dropping to around -4°C (24°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.

April Precipitation in Saint John

In Saint John in April, the precipitation amount is 48 mm (1.9 in) spread over a period of 10 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 48 mm (1.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec62745648452021022547471
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 82%. With an average temperature of 10°C (50°F), this humidity feels like a dense, heavy blanket wrapping around you, making every step feel sluggish and the air thick, which can make traveling quite uncomfortable.

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 82%, 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 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 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Saint John, you can refer to this 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 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2456891097532
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 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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