April Weather in Fontana, United States

Last updated: June 24, 2025

In April, the average temperature in Fontana, United States hovers around 17°C (63°F), offering a pleasant climate for various activities. Expect a minimum dip to 6°C (42°F), while the mercury can soar up to a sizzling 35°C (96°F). With an average humidity of 70%, the weather can feel quite moist. Additionally, anticipate about 35 mm (1.4 in) of precipitation over 3 days, so come prepared!

April Temperature in Fontana

In April in Fontana, the average temperature is 17°C (63°F), with maximums reaching 35°C (96°F) and minimums dropping to as low as 6°C (42°F). This temperature range makes Fontana an ideal destination for travelers seeking mild weather and opportunities for various outdoor activities.

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

The chart illustrates April temperature patterns in Fontana, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fontana, April typically has an average temperature of 17°C (63°F), with highs reaching up to 35°C (96°F) and lows dropping to around 6°C (42°F).

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

April Precipitation in Fontana

In Fontana in April, the precipitation amount is 35 mm (1.4 in) over the course of 3 days.

April Precipitation Trends in Fontana

The chart displays monthly precipitation patterns in Fontana, 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 Fontana, April typically receives around 35 mm (1.4 inches) of precipitation spread over approximately 3 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 Fontana

In Fontana in April humidity is 70%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making travel both refreshing and slightly sticky, as you navigate the air thick with moisture.

April Average Humidity in Fontana

This chart illustrates the average monthly humidity levels in Fontana, 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 Fontana is approximately 70%, 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 Fontana

In Fontana 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 Fontana.

Maximum UV Index Levels in Fontana for April

The chart shows the monthly maximum UV Index (UVI) for Fontana 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 Fontana typically reaches 10, which falls under the very high exposure category.

Data source: Fontana 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 Fontana Compares to Other Months

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

This table compares monthly weather conditions in Fontana, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	87 mm (3.4 inches)	74%	moderate
February Weather	12°C (54°F)	84 mm (3.3 inches)	79%	high
March Weather	14°C (57°F)	95 mm (3.7 inches)	75%	very high
April Weather	17°C (63°F)	35 mm (1.4 inches)	70%	very high
May Weather	18°C (66°F)	23 mm (0.9 inches)	70%	very high
June Weather	23°C (73°F)	3 mm (0.1 inches)	72%	extreme
July Weather	26°C (80°F)	1 mm (0.1 inches)	73%	extreme
August Weather	26°C (80°F)	2 mm (0.1 inches)	69%	very high
September Weather	24°C (76°F)	5 mm (0.2 inches)	68%	very high
October Weather	20°C (69°F)	15 mm (0.6 inches)	67%	high
November Weather	16°C (61°F)	35 mm (1.4 inches)	68%	moderate
December Weather	12°C (54°F)	87 mm (3.4 inches)	71%	moderate