July Weather in Fullerton, United States

Last updated: June 24, 2025

In July, the average temperature in Fullerton, United States is a pleasant 25°C (78°F), making it an inviting time to visit. However, be prepared for a range, as temperatures can drop to a minimum of 13°C (56°F) or peak at a sweltering 38°C (101°F). During this month, expect about 65 mm (2.5 in) of precipitation over 8 days, contributing to an average humidity level of 84%.

July Temperature in Fullerton

In July in Fullerton, the average temperature is 25°C (78°F). Maximums can reach 38°C (101°F), while minimums can drop to as low as 13°C (56°F). This climate makes it an ideal time for travelers looking to enjoy warm weather and explore the local attractions.

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 25°C (78°F), with highs reaching up to 38°C (101°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 precipitation amount is 65 mm (2.5 in) over a span of 8 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 65 mm (2.5 inches) of precipitation spread over approximately 8 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 84%. With an average temperature of 25°C (78°F), this humidity feels like a warm, muggy embrace that can be quite stifling for traveling, making you crave cool breezes and plenty of hydration as you explore.

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 84%, 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	-4°C (26°F)	28 mm (1.1 inches)	73%	moderate
February Weather	-4°C (25°F)	20 mm (0.8 inches)	81%	moderate
March Weather	4°C (40°F)	89 mm (3.5 inches)	69%	high
April Weather	9°C (49°F)	57 mm (2.2 inches)	71%	very high
May Weather	16°C (61°F)	142 mm (5.6 inches)	80%	very high
June Weather	24°C (75°F)	97 mm (3.8 inches)	83%	extreme
July Weather	25°C (78°F)	65 mm (2.5 inches)	84%	very high
August Weather	23°C (74°F)	84 mm (3.3 inches)	84%	very high
September Weather	20°C (69°F)	57 mm (2.2 inches)	77%	very high
October Weather	11°C (52°F)	83 mm (3.3 inches)	72%	high
November Weather	4°C (40°F)	22 mm (0.9 inches)	80%	moderate
December Weather	-1°C (31°F)	42 mm (1.6 inches)	79%	moderate