Herndon Weather in October

October in Herndon brings pleasant temperatures around 20°C (68°F) during the day, dropping to 8°C (46°F) at night, with the most rainfall of the year.

Rainfall in Herndon in October

Given that this is the rainiest month, it's wise to carry an umbrella to stay dry during unexpected showers. You can expect rain on around 11 days based on historical patterns, with 134 mm (5.3 in) average for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Herndon in October

If you're visiting Herndon in October, expect highs of 20°C (68°F) and overnight lows around 8°C (46°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights fall to 8°C (46°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Herndon in October

The month enjoys around 205 hours of sunshine, creating mostly sunny days with good weather conditions.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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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 October

Min Temperature 8°C (46°F)  

Max Temperature 20°C (68°F)  

Chance of Rain 37%  

Precipitation 134 mm (5.3 in)  

Rainy days 11 days  

Humidity 67% *  

Sunshine 205 hours *  

Percentage Sunshine 59% *  

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

What to Wear in Herndon in October

For Herndon in October, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Herndon in October

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

Cycling

9/10

Walking

9/10

Camping

3/10

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.