July weather forecast
Philadelphia, PA

The heat of the mid-summer month of July is in full effect in Philadelphia, Pennsylvania, with temperatures reaching their highest for the year, soaring to an average of 86.4°F (30.2°C). Compared to June, July also sees a small increase in rainfall, measuring at 1.54" (39mm). The splendid, sunny weather makes for ideal conditions for outdoor picnics and jaunts to the beach. Though temperatures remain high throughout the day and night, a mild wind blows consistently, providing some relief. As summer progresses, the city continues to bask in warm, sunny days.

Temperature

July, known for its average high temperature of 86.4°F (30.2°C) and an average low temperature of 69.3°F (20.7°C), is the warmest month.

Heat index

July's average heat index is computed to be a fiery hot 96.8°F (36°C). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
Understand that the heat index values take into account shaded locations and mild winds. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a metric representing the sensation of warmth when air temperature and moisture come together. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up 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.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

The average relative humidity in July in Philadelphia, Pennsylvania, is 72%.

Rainfall

In Philadelphia, in July, during 14.8 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. In Philadelphia, during the entire year, the rain falls for 127.8 days and collects up to 13.82" (351mm) of precipitation.

Snowfall

June through October are months without snowfall in Philadelphia, Pennsylvania.

Ocean temperature

In July, the average ocean temperature is 73.9°F (23.3°C).
Note: Considering one's resistance to cold, elements like sunshine, wind, and the prevailing temperature matter when taking a swim in 73.9°F (23.3°C) waters. (For comparison, the Olympic swimming standard is set between 77°F (25°C) and 82.4°F (28°C).)

Daylight

In July, the average length of the day in Philadelphia is 14h and 41min.
On the first day of the month, sunrise is at 5:36 am and sunset at 8:33 pm. On the last day of July, sunrise is at 5:58 am and sunset at 8:15 pm EDT.

Sunshine

The month with the most sunshine in Philadelphia is July, with an average of 10.6h of sunshine.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: In July, the UV index of 6 transforms into the following advice:
Shield from overexposure. Defense against sun-related harm is required. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Heads up! The reflection of sand and water notably intensifies UV rays from the Sun.