nomadseason

April Weather in Stony Brook, United States

Last updated: June 24, 2025

The average temperature in Stony Brook, United States during April is a cool 10°C (50°F). Expect ranges from a brisk -1°C (30°F) to a warm 26°C (79°F). Be prepared for some rain, with an average precipitation of 118 mm (4.7 in) spread over 12 days. The air tends to be quite humid, with an average humidity of 78%.

April Temperature in Stony Brook

In April in Stony Brook, the average temperature is 10°C (50°F). Maximums can reach 26°C (79°F), while minimums can drop as low as -1°C (30°F). Pack accordingly to enjoy a comfortable trip, as temperatures can vary significantly during your stay.

April Weather in Stony Brook: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Stony Brook, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stony Brook, April typically has an average temperature of 10°C (50°F), with highs reaching up to 26°C (79°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec343641505970777569604739
Data source: Temperature data for Stony Brook 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.

April Precipitation in Stony Brook

In Stony Brook in April, the total precipitation amount is 118 mm (4.7 in) over the course of 12 days.

April Precipitation Trends in Stony Brook

The chart displays monthly precipitation patterns in Stony Brook, 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 Stony Brook, April typically receives around 118 mm (4.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec709995119110901321089212994119
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

April Humidity in Stony Brook

In Stony Brook in April humidity is 78%. With an average temperature of 10°C (50°F), this humidity feels like a chilly dampness that can seep into your clothes, making outdoor activities less enjoyable and requiring extra layers to stay warm as you explore the area.

April Average Humidity in Stony Brook

This chart illustrates the average monthly humidity levels in Stony Brook, 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 Stony Brook is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Stony Brook

In Stony Brook 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 Stony Brook.

Maximum UV Index Levels in Stony Brook for April

The chart shows the monthly maximum UV Index (UVI) for Stony Brook 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 Stony Brook typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35681010998642
Data source: Stony Brook 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 Stony Brook Compares to Other Months

Weather in Stony Brook varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Stony Brook, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Stony Brook, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)70 mm (2.8 inches)84%moderate
February Weather2°C (36°F)99 mm (3.9 inches)82%moderate
March Weather5°C (41°F)95 mm (3.8 inches)81%high
April Weather10°C (50°F)118 mm (4.7 inches)78%very high
May Weather15°C (60°F)110 mm (4.3 inches)69%very high
June Weather21°C (70°F)90 mm (3.5 inches)69%very high
July Weather25°C (77°F)132 mm (5.2 inches)62%very high
August Weather24°C (75°F)108 mm (4.3 inches)65%very high
September Weather21°C (69°F)92 mm (3.6 inches)68%very high
October Weather15°C (60°F)129 mm (5.1 inches)74%high
November Weather8°C (47°F)94 mm (3.7 inches)82%moderate
December Weather4°C (39°F)119 mm (4.7 inches)80%low

Compare Stony Brook's Climate with Cities Worldwide