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April Weather in Riley, United States

Last updated: June 24, 2025

The average temperature in Riley, United States during April is a mild 12°C (55°F). However, temperatures can vary widely, with minimums dipping to -8°C (17°F) and maximums soaring to 33°C (91°F). Expect around 67 mm (2.6 inches) of precipitation over approximately 8 days, contributing to an average humidity of 73%.

April Temperature in Riley

In April in Riley, the average temperature is 12°C (55°F). The maximum can reach 33°C (91°F), while the minimum can drop as low as -8°C (17°F). Travelers should be prepared for a wide range of temperatures, ensuring they bring both warm and cool clothing.

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

The chart illustrates April temperature patterns in Riley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riley, April typically has an average temperature of 12°C (55°F), with highs reaching up to 33°C (91°F) and lows dropping to around -8°C (17°F).
JanFebMarAprMayJunJulAugSepOctNovDec313246546678817773574437
Data source: Temperature data for Riley 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 Riley

In Riley in April, the total precipitation amount is 67 mm (2.6 in) over the course of 8 days.

April Precipitation Trends in Riley

The chart displays monthly precipitation patterns in Riley, 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 Riley, April typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec30288467185798011964983327
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Riley

In Riley in April, humidity is 73%. With an average temperature of 12°C (55°F), this humidity feels like a cool, damp embrace that can make traveling a bit more challenging, as the air hangs heavy and might leave you feeling chilled, especially during outdoor adventures.

April Average Humidity in Riley

This chart illustrates the average monthly humidity levels in Riley, 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 Riley is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Riley

In Riley 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 Riley.

Maximum UV Index Levels in Riley for April

The chart shows the monthly maximum UV Index (UVI) for Riley 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 Riley typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Riley 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 Riley Compares to Other Months

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

This table compares monthly weather conditions in Riley, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)30 mm (1.2 inches)76%moderate
February Weather0°C (32°F)28 mm (1.1 inches)77%moderate
March Weather8°C (46°F)84 mm (3.3 inches)70%high
April Weather12°C (55°F)67 mm (2.6 inches)73%very high
May Weather19°C (66°F)185 mm (7.3 inches)82%very high
June Weather26°C (79°F)79 mm (3.1 inches)82%extreme
July Weather27°C (81°F)80 mm (3.1 inches)81%extreme
August Weather25°C (78°F)119 mm (4.7 inches)78%very high
September Weather23°C (73°F)64 mm (2.5 inches)71%very high
October Weather14°C (57°F)98 mm (3.9 inches)71%high
November Weather7°C (44°F)33 mm (1.3 inches)81%moderate
December Weather3°C (37°F)27 mm (1.0 inches)84%moderate

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