Herndon Weather in May

In Herndon, May brings high daytime temperatures around 24°C (75°F), with nights cooling to 12°C (54°F). Expect quite a bit of rainfall this month.

Rainfall in Herndon in May

You can expect rain on around 15 days based on historical patterns, with 130 mm (5.1 in) average 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 May

In May, Herndon gets high temperatures, with highs of 24°C (75°F). Nights cool to around 12°C (54°F). Overall, the month follows a fairly predictable daily temperature pattern. With lows of 12°C (54°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Herndon in May

With approximately 259 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

If you're inclined towards comfortable temperatures and drier conditions, May is a good time to visit Herndon.

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• January
• February
• March
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• May
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• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Herndon's climate page.

Herndon Temperature in May

Min Temperature 12°C (54°F)  

Max Temperature 24°C (75°F)  

Chance of Rain 48%  

Precipitation 130 mm (5.1 in)  

Rainy days 15 days  

Humidity 64% *  

Sunshine 259 hours *  

Percentage Sunshine 59% *  

* Data from: Washington DC, the United States of America (33 KM, 20 Miles).

What to Wear in Herndon in May

Comfortable temperatures call for an easy wardrobe in May. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Herndon in May

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Herndon's climate page.

More climate data for Herndon

Temperature Rainfall Sunshine Humidity

See the full Herndon climate overview or explore weather in the United States of America.