July weather forecast
Pasadena, CA

July experiences the highest temperatures of the year in Pasadena with a peak reading up to 85.5°F (29.7°C). Signifying midsummer, July comes with longer daylight hours, less rainfall, and a significant increase in UV index. With the sun reigning supreme and minimal cloud coverage, outdoor activities require sun protection measures. Despite the heat, the city thrives in high spirit, with locals and tourists enjoying a multitude of outdoor and water-based activities. An increase in the UV index necessitates sun protection and hydration, to ensure a comfortable and safe exploration of Pasadena.

Temperature

The introduction of July sees an average high-temperature of a still warm 85.5°F (29.7°C), hardly deviating from June. Pasadena's average low-temperature of 63.5°F (17.5°C) in July reflects a significant disparity from the daytime highs.

Heat index

July's average heat index is appraised at a tropical 87.8°F (31°C). Remaining active during long-lasting exposure could cause fatigue, leading to heat cramps.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'real feel' or 'apparent temperature', reflects the feeling of heat when considering both air temperature and humidity. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.

Humidity

In Pasadena, the average relative humidity in July is 52%.

Rainfall

In Pasadena, during July, the rain falls for 3.2 days and regularly aggregates up to 0.24" (6mm) of precipitation. In Pasadena, during the entire year, the rain falls for 50.1 days and collects up to 8.5" (216mm) of precipitation.

Daylight

In July, the average length of the day is 14h and 10min.
On the first day of July, sunrise is at 5:44 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 6:03 am and sunset at 7:54 pm PDT.

Sunshine

The months with the most sunshine are June and July, with an average of 12.1h 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 radiation for the average person.
Note: In July, the average maximum UV index of 6 translates into the following recommendations:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.