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April Weather in Riverhead, United States

Last updated: June 24, 2025

In Riverhead, United States, the average temperature during April is a cool 9°C (49°F). Expect temperatures to range from a chilly 0°C (31°F) to a mild 22°C (72°F). This month typically sees precipitation of 126 mm (5.0 in) spread over 12 days, with an average humidity level of 78%, creating a damp and refreshing atmosphere.

April Temperature in Riverhead

In April in Riverhead, the average temperature is 9°C (49°F). The maximum can reach 22°C (72°F), and the minimum can be as low as 0°C (31°F). It's a great time to visit for those who enjoy mild, crisp weather and the chance to experience both warm and chilly moments.

April Weather in Riverhead: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Riverhead, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riverhead, April typically has an average temperature of 9°C (49°F), with highs reaching up to 22°C (72°F) and lows dropping to around 0°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec353640485768757569614941
Data source: Temperature data for Riverhead 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 Riverhead

In Riverhead in April, the precipitation amount is 126 mm (5.0 in) over the course of 12 days.

April Precipitation Trends in Riverhead

The chart displays monthly precipitation patterns in Riverhead, 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 Riverhead, April typically receives around 126 mm (5.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec79106101126114761179689139100137
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Riverhead

In Riverhead in April, humidity is 78%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that clings to your skin, making it essential to dress in layers while traveling, as the cool air combines with the moisture to create a brisk and invigorating atmosphere.

April Average Humidity in Riverhead

This chart illustrates the average monthly humidity levels in Riverhead, 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 Riverhead 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 Riverhead

In Riverhead 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 Riverhead.

Maximum UV Index Levels in Riverhead for April

The chart shows the monthly maximum UV Index (UVI) for Riverhead 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 Riverhead typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
Data source: Riverhead 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 Riverhead Compares to Other Months

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

This table compares monthly weather conditions in Riverhead, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)79 mm (3.1 inches)84%moderate
February Weather2°C (37°F)106 mm (4.2 inches)82%moderate
March Weather4°C (40°F)101 mm (4.0 inches)81%high
April Weather9°C (49°F)126 mm (5.0 inches)78%very high
May Weather14°C (58°F)114 mm (4.5 inches)69%very high
June Weather20°C (68°F)76 mm (3.0 inches)69%very high
July Weather24°C (75°F)117 mm (4.6 inches)62%very high
August Weather24°C (75°F)96 mm (3.8 inches)65%very high
September Weather21°C (70°F)89 mm (3.5 inches)68%very high
October Weather16°C (61°F)139 mm (5.5 inches)74%high
November Weather9°C (49°F)100 mm (3.9 inches)82%moderate
December Weather5°C (41°F)137 mm (5.4 inches)80%low

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