Herndon, United States — Weather in June 2026

Climate Overview

Herndon, United States in June has hot conditions, with highs reaching 28.4°C (83°F) and afternoons the warmest part of the day. Rain falls on about 11 days this month. Temperatures drop noticeably between day and night.

This month falls at the beginning of Summer.

Daily highs in June gradually rise from around 27°C (81°F) at the start to 30°C (87°F) by month's end.

Rainfall is heaviest during the middle of the month, while the last third tends to be drier.

Expect around 11.4h of sunshine at the start of June, increasing to 12.5h by the end.

The warmest days tend to fall around the 30th, averaging 31°C (88°F).

Compared to May, this month is about 6°C warmer with 3 fewer rainy days. Temperatures will rise further into July.

Monthly June Averages

Temperature

28°C / 18°C

Feels Like

31°C / 19°C

Rain

11 days · 100 mm

Sunshine

11.3h / day

Humidity

69% — Muggy

Wind

14 km/h

Wind Direction

WSW (244°)

Gusts

35 km/h

Daylight

14.9 h

Cloud Cover

60%

Clear Sky Days

UV Index

7.3 — Very High

Dew Point

17°C — Humid

Moon Phase

New Moon · 0%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

High Low

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 05:43

Daylight 14.9h

Sunset 20:37

What to Expect

Daytime temperatures around 28°C (83°F) are ideal for full-day outdoor exploration.

Rain usually comes in shorter passing showers rather than all-day rain.

1 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	6°C / -2°C	2°C / -6°C	9days (83 mm) Wet	6.2h Fair	68% Muggy	2.7 Moderate	Poor	View Details
February	9°C / 0°C	6°C / -4°C	10days (88 mm) Wet	6.7h Fair	67% Muggy	3.4 Moderate	Poor	View Details
March	14°C / 3°C	11°C / -1°C	10days (76 mm) Wet	8.3h Good	64% Muggy	5 Moderate	Fair	View Details
April best	19°C / 8°C	18°C / 5°C	10days (84 mm) Wet	9.1h Good	65% Muggy	5.9 High	Good	View Details
May best	23°C / 13°C	24°C / 12°C	14days (121 mm) Wet	9.2h Good	74% Muggy	6.5 High	Excellent	View Details
June best	28°C / 18°C	31°C / 19°C	11days (100 mm) Wet	11.3h Excellent	69% Muggy	7.3 Very High	Excellent	View Details
July	31°C / 22°C	35°C / 24°C	14days (129 mm) Wet	11.7h Excellent	70% Muggy	7.5 Very High	Fair	View Details
August best	29°C / 20°C	32°C / 23°C	13days (101 mm) Wet	10.5h Excellent	74% Muggy	6.9 High	Good	View Details
September best	26°C / 17°C	27°C / 18°C	11days (105 mm) Wet	8.5h Good	73% Muggy	5.2 High	Excellent	View Details
October	20°C / 11°C	19°C / 10°C	8days (73 mm) Wet	7.9h Good	72% Muggy	4.5 Moderate	Good	View Details
November	13°C / 4°C	11°C / 1°C	8days (73 mm) Wet	7.2h Good	67% Muggy	3.1 Moderate	Fair	View Details
December	8°C / 0°C	5°C / -4°C	9days (94 mm) Wet	5.9h Fair	70% Muggy	2.3 Moderate	Poor	View Details

What to Wear

Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.

Temperatures drop significantly at night, so pack layers you can add or remove throughout the day.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

UmbrellaWaterproof jacketBreathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

Expand all

Is June a good time to visit Herndon?

June is typically excellent for visiting Herndon, with average highs of 28°C (83°F) and around 11 rainy days. Herndon, United States in June has hot conditions, with highs reaching 28.4°C (83°F) and afternoons the warmest part of

Does it rain a lot in Herndon in June?

Herndon typically sees around 11 rainy days in June with 100 mm (3.9 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Herndon in June?

Evenings in Herndon during June are mild at 18°C (65°F). A light cardigan is usually enough.

What should I pack for Herndon in June?

With highs of 28°C (83°F) and lows of 18°C (65°F) in June, we recommend: Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. Comfortable walking shoes are essential.

Is June among the best months weather-wise in Herndon?

Yes, June offers some of the best weather conditions in Herndon with comfortable temperatures and lower chances of rain.

What is the UV index in Herndon in June?

The average UV index in Herndon during June is 7 (high). Wear sunscreen SPF 30+, a hat, and sunglasses. Limit direct sun exposure between 10 AM and 4 PM.

How many hours of daylight are there in Herndon in June?

Herndon gets approximately 15 hours of daylight per day in June, with around 11 hours of sunshine.

Does it snow in Herndon in June?

Snow is uncommon in Herndon during June based on 10-year climate averages.

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