Herndon Weather in July

July in Herndon brings very high temperatures, with highs of 31°C (88°F) and nights dropping to 20°C (68°F). Rainfall is on the higher side this month, averaging around 89 mm (3.5 in), so keep a rain jacket handy.

Rainfall in Herndon in July

Typically around 12 days of rainfall are expected, averaging 89 mm (3.5 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Herndon in July

Daytime highs in Herndon in July reach 31°C (88°F), with nights around 20°C (68°F). It's usually most comfortable outside during the morning and later in the day. Nights drop to around 20°C (68°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable. Average temperatures can be deceiving; some days will be hotter. Wear breathable fabrics and drink plenty of water to stay cool.

Sunshine in Herndon in July

The month enjoys around 279 hours of sunshine, creating mostly sunny days with good weather conditions.

Should you favor a climate that's both dry and comfortably warm, April, May, June, September and October typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.