July Weather in Fullerton, United States

Last updated: June 24, 2025

In July, the average temperature in Fullerton, United States hovers around a pleasant 24°C (76°F). Expect a range of temperatures from a cool 13°C (56°F) to a warm 36°C (97°F). With an average precipitation of 136 mm (5.3 in) spread over 14 days, and an average humidity of 65%, be prepared for a mix of warm days and occasional rainfall.

July Temperature in Fullerton

In July in Fullerton, the average temperature is 24°C (76°F), with maximums reaching up to 36°C (97°F) and minimums dropping as low as 13°C (56°F). This diverse temperature range makes it a great time for travelers to enjoy both warm days and cooler evenings.

July Weather in Fullerton: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Fullerton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fullerton, July typically has an average temperature of 24°C (76°F), with highs reaching up to 36°C (97°F) and lows dropping to around 13°C (56°F).

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

July Precipitation in Fullerton

In Fullerton in July, the total precipitation amount is 136 mm (5.3 in) spread over 14 days.

July Precipitation Trends in Fullerton

The chart displays monthly precipitation patterns in Fullerton, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Fullerton, July typically receives around 136 mm (5.3 inches) of precipitation spread over approximately 14 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Fullerton

In Fullerton in July, humidity is 65%. With an average temperature of 24°C (76°F), this humidity feels like a warm, enveloping blanket—it can make outdoor activities a bit sticky, necessitating plenty of hydration breaks and perhaps a leisurely pace while touring.

July Average Humidity in Fullerton

This chart illustrates the average monthly humidity levels in Fullerton, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Fullerton is approximately 65%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Fullerton

In Fullerton in July, 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 Fullerton.

Maximum UV Index Levels in Fullerton for July

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

Data source: Fullerton July 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 July Weather in Fullerton Compares to Other Months

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

This table compares monthly weather conditions in Fullerton, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (32°F)	75 mm (2.9 inches)	87%	moderate
February Weather	1°C (34°F)	109 mm (4.3 inches)	85%	moderate
March Weather	4°C (40°F)	99 mm (3.9 inches)	85%	high
April Weather	10°C (51°F)	115 mm (4.5 inches)	83%	very high
May Weather	16°C (61°F)	141 mm (5.5 inches)	75%	very high
June Weather	21°C (70°F)	106 mm (4.2 inches)	73%	very high
July Weather	24°C (76°F)	136 mm (5.3 inches)	65%	very high
August Weather	23°C (74°F)	142 mm (5.6 inches)	62%	very high
September Weather	20°C (68°F)	111 mm (4.4 inches)	66%	very high
October Weather	14°C (57°F)	122 mm (4.8 inches)	79%	high
November Weather	6°C (43°F)	95 mm (3.7 inches)	87%	moderate
December Weather	2°C (36°F)	110 mm (4.3 inches)	85%	low