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April Weather in Johnston, United States

Last updated: June 24, 2025

In April, the average temperature in Johnston, United States hovers around 9°C (49°F). However, be prepared for a range of temperatures; it can dip as low as -10°C (13°F) or soar up to 30°C (87°F). Expect about 75 mm (2.9 in) of precipitation over 10 days, contributing to an average humidity level of 77%.

April Temperature in Johnston

In April in Johnston, the average temperature is 9°C (49°F), with maximums reaching 30°C (87°F) and minimums dipping as low as -10°C (13°F). This range makes Johnston a fascinating destination for travelers seeking both warmth and the coolness of winter's embrace.

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

The chart illustrates April temperature patterns in Johnston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Johnston, April typically has an average temperature of 9°C (49°F), with highs reaching up to 30°C (87°F) and lows dropping to around -10°C (13°F).
JanFebMarAprMayJunJulAugSepOctNovDec222339496274777468523830
Data source: Temperature data for Johnston 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 Johnston

In Johnston in April, the precipitation amount is 75 mm (2.9 in) spread over a period of 10 days.

April Precipitation Trends in Johnston

The chart displays monthly precipitation patterns in Johnston, 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 Johnston, April typically receives around 75 mm (2.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec3740817516910976871201283937
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Johnston

In Johnston in April humidity is 77%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making outdoor explorations feel colder and more uncomfortable than the thermometer suggests.

April Average Humidity in Johnston

This chart illustrates the average monthly humidity levels in Johnston, 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 Johnston is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Johnston

In Johnston 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 Johnston.

Maximum UV Index Levels in Johnston for April

The chart shows the monthly maximum UV Index (UVI) for Johnston 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 Johnston typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Johnston 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 Johnston Compares to Other Months

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

This table compares monthly weather conditions in Johnston, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)37 mm (1.4 inches)78%moderate
February Weather-5°C (23°F)40 mm (1.6 inches)80%moderate
March Weather4°C (40°F)81 mm (3.2 inches)77%high
April Weather9°C (49°F)75 mm (2.9 inches)77%very high
May Weather17°C (62°F)169 mm (6.7 inches)77%very high
June Weather23°C (74°F)109 mm (4.3 inches)81%extreme
July Weather25°C (77°F)76 mm (3.0 inches)81%very high
August Weather23°C (74°F)87 mm (3.4 inches)77%very high
September Weather20°C (69°F)120 mm (4.7 inches)73%very high
October Weather11°C (53°F)128 mm (5.0 inches)75%high
November Weather3°C (39°F)39 mm (1.5 inches)85%moderate
December Weather-1°C (31°F)37 mm (1.5 inches)83%moderate

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