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April Weather in Altena, Germany

Last updated: August 23, 2025

In April, the average temperature in Altena, Germany hovers around 9°C (48°F), with a minimum dipping to -5°C (23°F) and a maximum reaching as high as 26°C (79°F). Expect about 49 mm (1.9 in) of precipitation spread over 11 days, while the air maintains a notable average humidity of 83%.

April Temperature in Altena

In April in Altena, the average temperature is 9°C (48°F), with maximums that can reach 26°C (79°F) and minimums that can dip as low as -5°C (23°F). This range makes it a great time to experience the diverse weather, so travelers should pack accordingly for both warm days and chilly evenings.

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

The chart illustrates April temperature patterns in Altena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altena, April typically has an average temperature of 9°C (48°F), with highs reaching up to 26°C (79°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec353742485463646457514238
Data source: Temperature data for Altena 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 Altena

In Altena in April, the total precipitation amount is 49 mm (1.9 in) spread over 11 days.

April Precipitation Trends in Altena

The chart displays monthly precipitation patterns in Altena, 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 Altena, April typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec10096104499381108967510466124
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Altena

In Altena in April humidity is 83%. With an average temperature of 9°C (48°F), this humidity feels like an enveloping blanket, making outdoor activities quite uncomfortable and encouraging travelers to seek shelter or shade frequently.

April Average Humidity in Altena

This chart illustrates the average monthly humidity levels in Altena, 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 Altena is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%90%87%83%76%74%74%75%82%88%91%92%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Altena

In Altena in April, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Altena.

Maximum UV Index Levels in Altena for April

The chart shows the monthly maximum UV Index (UVI) for Altena 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 Altena typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Altena 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 Altena Compares to Other Months

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

This table compares monthly weather conditions in Altena, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)100 mm (3.9 inches)92%low
February Weather3°C (37°F)96 mm (3.8 inches)90%low
March Weather5°C (42°F)103 mm (4.1 inches)87%moderate
April Weather9°C (48°F)49 mm (1.9 inches)83%moderate
May Weather12°C (54°F)93 mm (3.7 inches)76%high
June Weather17°C (63°F)81 mm (3.2 inches)74%very high
July Weather18°C (64°F)107 mm (4.2 inches)74%very high
August Weather18°C (64°F)96 mm (3.8 inches)75%high
September Weather14°C (57°F)75 mm (3.0 inches)82%moderate
October Weather10°C (51°F)104 mm (4.1 inches)88%moderate
November Weather6°C (42°F)66 mm (2.6 inches)90%low
December Weather3°C (38°F)124 mm (4.9 inches)92%low

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