April Weather in Johnston, United States

Last updated: June 24, 2025

The average temperature in Johnston, United States during April hovers around 18°C (65°F). Expect temperatures to vary, with lows of 0°C (33°F) and highs reaching 32°C (91°F). Rainfall is not uncommon, with an average precipitation amount of 115 mm (4.5 in) spread over 8 days. Additionally, you'll experience moderate humidity levels at 79%, making this month a blend of comfortable warmth and occasional showers.

April Temperature in Johnston

In April in Johnston, the average temperature is 18°C (65°F). Maximum temperatures can reach 32°C (91°F) and minimums can be as low as 0°C (33°F). Overall, this diverse climate makes Johnston an ideal destination for travelers seeking both warmth and cool escapes.

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 18°C (65°F), with highs reaching up to 32°C (91°F) and lows dropping to around 0°C (33°F).

Data source: Temperature data for Johnston generated using information from the Copernicus Climate Change Service.

April Precipitation in Johnston

In Johnston in April, the precipitation amount is 115 mm (4.5 in) over the course of 8 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 115 mm (4.5 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

April Humidity in Johnston

In Johnston in April, humidity is 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.

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 79%, offering insight into how humid the weather typically is during this month.

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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check 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 10, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	84 mm (3.3 inches)	86%	moderate
February Weather	12°C (54°F)	114 mm (4.5 inches)	81%	high
March Weather	14°C (58°F)	85 mm (3.4 inches)	81%	very high
April Weather	18°C (65°F)	115 mm (4.5 inches)	79%	very high
May Weather	23°C (74°F)	110 mm (4.3 inches)	75%	extreme
June Weather	26°C (79°F)	101 mm (4.0 inches)	75%	extreme
July Weather	28°C (82°F)	137 mm (5.4 inches)	80%	extreme
August Weather	27°C (80°F)	142 mm (5.6 inches)	81%	extreme
September Weather	25°C (77°F)	84 mm (3.3 inches)	83%	very high
October Weather	20°C (69°F)	80 mm (3.1 inches)	78%	very high
November Weather	13°C (55°F)	69 mm (2.7 inches)	85%	high
December Weather	10°C (51°F)	119 mm (4.7 inches)	87%	moderate