July weather forecast
Fullerton, CA

July sets the stage as the hottest month in Fullerton with average high temperatures soaring to 81.5°F (27.5°C). But, residents and visitors need not worry about sweltering heat as the city records the lowest relative humidity of 61%. The cooling breeze of 5.1mph (8.2km/h) offers comfort in the warm weather, while the rainfall almost triples from June, recording 0.28" (7mm). The plentiful sunlight allows for long outdoor ventures during July. Nevertheless, pack your sunscreen as the UV index creeps up to 6 this month.

Temperature

The high-temperature average in July for Fullerton is a still moderately hot 81.5°F (27.5°C), staying closely aligned with June's conditions. The average low-temperature during July nights is a comfortable 63.9°F (17.7°C).

Heat index

July's mean heat index is evaluated at 84.2°F (29°C). Long-lasting exposure and activity potentially induce a sense of weariness, with the risk of heat cramps.
Understand that the heat index values take into account shaded locations and mild winds. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', provides an understanding of perceived warmth by combining temperature and relative humidity. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.

Humidity

In Fullerton, the average relative humidity in July is 61%.

Rainfall

In Fullerton, in July, during 3.9 rainfall days, 0.28" (7mm) of precipitation is typically accumulated. In Fullerton, California, during the entire year, the rain falls for 52.5 days and collects up to 7.09" (180mm) of precipitation.

Daylight

The average length of the day in July is 14h and 9min.
On the first day of the month, sunrise is at 5:44 am and sunset at 8:06 pm. On the last day of July, sunrise is at 6:03 am and sunset at 7:52 pm PDT.

Sunshine

The months with the most sunshine are July and August, with an average of 12h of sunshine.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 6 during July translates into the following guidance:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.