What is the weather in Herndon right now?

Current weather in Herndon is scattered clouds.

Where can I find the hourly weather forecast for Herndon?

This page shows hourly weather forecast for Herndon, including temperature, wind, precipitation, humidity and cloud cover.

Is the weather forecast for Herndon updated regularly?

Weather data for Herndon is updated regularly with the latest available observations and forecasts.

Now · 10:58 AM

Herndon Weather & Hourly Forecast

United States · Virginia · 20170

81°F

Partly cloudy

Feels like: 87°F

💧 Humidity 78% 🌡 Pressure 30.03 inHg 💨 Wind 5 mph 👁 Visibility 6.2 mi ☁ Clouds 38% ☀️ UV index 3.4 · Moderate 🌅 Sunrise 6:40 AM 🌇 Sunset 7:37 PM

Hourly Forecast for Herndon

Today

11:00 AM

Partly cloudy

81° 💧 None 💨 5 mph H 78%30.03 inHg

2:00 PM

Partly cloudy

81° 💧 None 💨 8 mph H 55%29.97 inHg

5:00 PM

Mostly cloudy

90° 💧 None 💨 3 mph H 40%29.88 inHg

8:00 PM

Mostly cloudy night

80° 💧 0.01 in 💨 2 mph H 50%29.88 inHg

11:00 PM

Mostly clear night

76° 💧 0.01 in 💨 7 mph H 79%29.94 inHg

Tomorrow

2:00 AM

Mostly cloudy night

72° 💧 0.03 in 💨 4 mph H 87%29.91 inHg

5:00 AM

Overcast night

72° 💧 0.01 in 💨 4 mph H 89%29.91 inHg

8:00 AM

Mostly cloudy

74° 💧 None 💨 3 mph H 86%29.91 inHg

11:00 AM

Sunny

85° 💧 None 💨 9 mph H 53%29.94 inHg

2:00 PM

Sunny

81° 💧 None 💨 12 mph H 36%29.88 inHg

5:00 PM

Light rain

84° 💧 0.01 in 💨 8 mph H 47%29.80 inHg

8:00 PM

Overcast night

80° 💧 0.06 in 💨 7 mph H 57%29.83 inHg

11:00 PM

Light rain

75° 💧 0.02 in 💨 3 mph H 94%29.85 inHg

Saturday

2:00 AM

Mostly cloudy night

71° 💧 None 💨 5 mph H 91%29.85 inHg

5:00 AM

Partly cloudy night

68° 💧 None 💨 5 mph H 94%29.88 inHg

8:00 AM

Mostly sunny

70° 💧 None 💨 5 mph H 89%29.88 inHg

Today

11:00 AM

Partly cloudy

81° 💧 None 💨 5 mph H 78%30.03 inHg

12:00 PM

Partly cloudy

82° 💧 None 💨 6 mph H 74%30.03 inHg

1:00 PM

Partly cloudy

83° 💧 None 💨 7 mph H 66%30.00 inHg

2:00 PM

Partly cloudy

81° 💧 None 💨 8 mph H 55%29.97 inHg

3:00 PM

Sunny

86° 💧 None 💨 7 mph H 45%29.97 inHg

4:00 PM

Partly cloudy

93° 💧 None 💨 5 mph H 30%29.88 inHg

5:00 PM

Mostly cloudy

90° 💧 None 💨 3 mph H 40%29.88 inHg

6:00 PM

Mostly cloudy

86° 💧 None 💨 3 mph H 41%29.88 inHg

7:00 PM

Mostly cloudy

83° 💧 None 💨 3 mph H 44%29.88 inHg

8:00 PM

Mostly cloudy night

80° 💧 None 💨 2 mph H 50%29.88 inHg

9:00 PM

Light rain

80° 💧 0.01 in 💨 8 mph H 59%29.91 inHg

10:00 PM

Light rain

77° 💧 0.01 in 💨 6 mph H 71%29.94 inHg

11:00 PM

Mostly clear night

76° 💧 None 💨 7 mph H 79%29.94 inHg

Tomorrow

12:00 AM

Light rain

75° 💧 0.01 in 💨 5 mph H 83%29.94 inHg

1:00 AM

Light rain

74° 💧 0.00 in 💨 7 mph H 87%29.94 inHg

2:00 AM

Mostly cloudy night

72° 💧 None 💨 4 mph H 87%29.91 inHg

3:00 AM

Light rain

72° 💧 0.03 in 💨 4 mph H 91%29.94 inHg

4:00 AM

Overcast night

72° 💧 None 💨 4 mph H 89%29.91 inHg

5:00 AM

Overcast night

72° 💧 None 💨 4 mph H 89%29.91 inHg

6:00 AM

Mostly cloudy night

72° 💧 None 💨 4 mph H 89%29.91 inHg

7:00 AM

Light rain

72° 💧 0.01 in 💨 3 mph H 90%29.91 inHg

8:00 AM

Mostly cloudy

74° 💧 None 💨 3 mph H 86%29.91 inHg

9:00 AM

Sunny

77° 💧 None 💨 5 mph H 76%29.91 inHg

10:00 AM

Sunny

82° 💧 None 💨 7 mph H 63%29.91 inHg

11:00 AM

Sunny

85° 💧 None 💨 9 mph H 53%29.94 inHg

12:00 PM

Sunny

86° 💧 None 💨 8 mph H 45%29.91 inHg

1:00 PM

Sunny

87° 💧 None 💨 9 mph H 39%29.88 inHg

2:00 PM

Sunny

81° 💧 None 💨 12 mph H 36%29.88 inHg

3:00 PM

Partly cloudy

87° 💧 None 💨 10 mph H 30%29.83 inHg

4:00 PM

Mostly cloudy

90° 💧 None 💨 12 mph H 30%29.80 inHg

5:00 PM

Light rain

84° 💧 0.01 in 💨 8 mph H 47%29.80 inHg

6:00 PM

Overcast

84° 💧 None 💨 9 mph H 46%29.80 inHg

7:00 PM

Overcast

80° 💧 None 💨 7 mph H 53%29.80 inHg

8:00 PM

Overcast night

80° 💧 None 💨 7 mph H 57%29.83 inHg

9:00 PM

Light rain

78° 💧 0.03 in 💨 7 mph H 83%29.85 inHg

10:00 PM

Light rain

75° 💧 0.02 in 💨 7 mph H 93%29.85 inHg

11:00 PM

Light rain

75° 💧 0.02 in 💨 3 mph H 94%29.85 inHg

Saturday

12:00 AM

Mostly cloudy night

74° 💧 None 💨 5 mph H 91%29.85 inHg

1:00 AM

Mostly cloudy night

73° 💧 None 💨 6 mph H 91%29.85 inHg

2:00 AM

Mostly cloudy night

71° 💧 None 💨 5 mph H 91%29.85 inHg

3:00 AM

Overcast night

70° 💧 None 💨 4 mph H 92%29.85 inHg

4:00 AM

Partly cloudy night

69° 💧 None 💨 4 mph H 93%29.85 inHg

5:00 AM

Partly cloudy night

68° 💧 None 💨 5 mph H 94%29.88 inHg

6:00 AM

Partly cloudy night

68° 💧 None 💨 5 mph H 94%29.88 inHg

7:00 AM

Partly cloudy

67° 💧 None 💨 5 mph H 94%29.88 inHg

8:00 AM

Mostly sunny

70° 💧 None 💨 5 mph H 89%29.88 inHg

9:00 AM

Sunny

73° 💧 None 💨 6 mph H 80%29.88 inHg

10:00 AM

Sunny

76° 💧 None 💨 7 mph H 67%29.88 inHg

11:00 AM

Sunny

80° 💧 None 💨 8 mph H 53%29.91 inHg

12:00 PM

Sunny

82° 💧 None 💨 8 mph H 45%29.88 inHg

1:00 PM

Sunny

85° 💧 None 💨 9 mph H 38%29.88 inHg

2:00 PM

Sunny

86° 💧 None 💨 11 mph H 35%29.88 inHg

3:00 PM

Overcast

86° 💧 None 💨 11 mph H 36%29.85 inHg

4:00 PM

Overcast

85° 💧 None 💨 11 mph H 37%29.85 inHg

5:00 PM

Overcast

81° 💧 None 💨 12 mph H 43%29.83 inHg

6:00 PM

Overcast

80° 💧 None 💨 9 mph H 45%29.83 inHg

7:00 PM

Overcast

76° 💧 None 💨 7 mph H 50%29.88 inHg

8:00 PM

Overcast night

73° 💧 None 💨 4 mph H 53%29.88 inHg

9:00 PM

Mostly cloudy night

71° 💧 None 💨 3 mph H 56%29.88 inHg

10:00 PM

Partly cloudy night

69° 💧 None 💨 5 mph H 60%29.91 inHg

11:00 PM

Partly cloudy night

67° 💧 None 💨 5 mph H 65%29.91 inHg

Sunday

12:00 AM

Mostly clear night

66° 💧 None 💨 4 mph H 69%29.94 inHg

1:00 AM

Mostly clear night

65° 💧 None 💨 4 mph H 73%29.94 inHg

2:00 AM

Mostly clear night

63° 💧 None 💨 5 mph H 77%29.97 inHg

3:00 AM

Clear night

62° 💧 None 💨 6 mph H 79%29.97 inHg

4:00 AM

Clear night

61° 💧 None 💨 6 mph H 81%29.97 inHg

5:00 AM

Clear night

60° 💧 None 💨 6 mph H 83%29.97 inHg

6:00 AM

Clear night

60° 💧 None 💨 6 mph H 85%29.97 inHg

7:00 AM

Sunny

59° 💧 None 💨 6 mph H 86%30.00 inHg

8:00 AM

Sunny

62° 💧 None 💨 7 mph H 78%30.00 inHg

9:00 AM

Sunny

67° 💧 None 💨 8 mph H 67%30.03 inHg

10:00 AM

Sunny

71° 💧 None 💨 8 mph H 59%30.03 inHg

11:00 AM

Sunny

74° 💧 None 💨 7 mph H 53%30.03 inHg

12:00 PM

Sunny

76° 💧 None 💨 7 mph H 47%30.03 inHg

1:00 PM

Sunny

78° 💧 None 💨 6 mph H 43%30.00 inHg

2:00 PM

Sunny

80° 💧 None 💨 6 mph H 39%30.00 inHg

3:00 PM

Sunny

81° 💧 None 💨 6 mph H 37%30.00 inHg

4:00 PM

Sunny

81° 💧 None 💨 6 mph H 36%30.00 inHg

5:00 PM

Sunny

81° 💧 None 💨 7 mph H 36%30.00 inHg

6:00 PM

Mostly sunny

78° 💧 None 💨 8 mph H 42%30.00 inHg

7:00 PM

Mostly sunny

74° 💧 None 💨 8 mph H 51%30.03 inHg

8:00 PM

Partly cloudy night

71° 💧 None 💨 7 mph H 55%30.06 inHg

9:00 PM

Clear night

68° 💧 None 💨 7 mph H 65%30.09 inHg

10:00 PM

Clear night

68° 💧 None 💨 7 mph H 75%30.09 inHg

11:00 PM

Clear night

66° 💧 None 💨 6 mph H 78%30.12 inHg

Monday

12:00 AM

Clear night

65° 💧 None 💨 5 mph H 81%30.12 inHg

1:00 AM

Clear night

64° 💧 None 💨 3 mph H 84%30.12 inHg

2:00 AM

Clear night

63° 💧 None 💨 3 mph H 88%30.15 inHg

3:00 AM

Clear night

61° 💧 None 💨 4 mph H 91%30.15 inHg

4:00 AM

Clear night

60° 💧 None 💨 3 mph H 92%30.15 inHg

5:00 AM

Clear night

60° 💧 None 💨 3 mph H 93%30.18 inHg

6:00 AM

Clear night

59° 💧 None 💨 3 mph H 93%30.18 inHg

7:00 AM

Sunny

59° 💧 None 💨 3 mph H 92%30.18 inHg

8:00 AM

Sunny

63° 💧 None 💨 3 mph H 84%30.21 inHg

9:00 AM

Sunny

68° 💧 None 💨 3 mph H 72%30.21 inHg

10:00 AM

Sunny

72° 💧 None 💨 2 mph H 61%30.21 inHg

In Herndon and, more broadly, across the state of Virginia: The rest of the day will be mostly sunny with a few clouds, and temperatures will remain hot, ranging from 72 to 88 degrees. A chance of light rain exists, with potential accumulations around 0.17 inches, and there's a high likelihood of rain developing at some point. Winds will be gentle, coming from the northwest at around 8 mph, with gusts reaching up to 17 mph. Overall, expect warm and partly cloudy conditions with a possibility of brief showers later in the day.

15-Day Weather Outlook for Herndon

TomorrowTomorrow

Light rain 89°/71° 💧 0.08 in 💨 10 mph

Saturday, Sep 5Sat Sep 5

Moderate rain 86°/68° 💧 0.11 in 💨 12 mph

Sunday, Sep 6Sun Sep 6

Sunny 80°/60° 💧 None 💨 11 mph

Monday, Sep 7Mon Sep 7

Partly cloudy 81°/60° 💧 None 💨 5 mph

Tuesday, Sep 8Tue Sep 8

Overcast 82°/61° 💧 None 💨 8 mph

Wednesday, Sep 9Wed Sep 9

Light rain 87°/68° 💧 0.17 in 💨 7 mph

Thursday, Sep 10Thu Sep 10

Moderate rain 96°/71° 💧 0.17 in 💨 12 mph

Friday, Sep 11Fri Sep 11

Mostly cloudy 79°/65° 💧 None 💨 9 mph

Saturday, Sep 12Sat Sep 12

Mostly cloudy 79°/63° 💧 None 💨 8 mph

Sunday, Sep 13Sun Sep 13

Light rain 91°/65° 💧 0.02 in 💨 9 mph

Monday, Sep 14Mon Sep 14

Moderate rain 99°/70° 💧 0.30 in 💨 9 mph

Tuesday, Sep 15Tue Sep 15

Moderate rain 88°/71° 💧 0.25 in 💨 5 mph

Wednesday, Sep 16Wed Sep 16

Light rain 90°/72° 💧 0.08 in 💨 7 mph

Thursday, Sep 17Thu Sep 17

Overcast 87°/73° 💧 None 💨 5 mph

Friday, Sep 18Fri Sep 18

Mostly sunny 89°/71° 💧 None 💨 7 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Herndon

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Herndon

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 11:00 AM

PM2.5 Fine particles Good 6,2µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 7,0µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Good 51,1µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 1,6µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is favorable for outdoor activities.

UV & HEALTH

UV, Sun & Health Outlook in Herndon

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 8,2Very high 😊Good

Tomorrow UV 6,5High 😐Moderate

Saturday UV 5,1Moderate 🙂Fair

Sunday UV 7,2High 🙂Fair

Monday UV 6,0High 😊Good

Tuesday UV 6,0High —Unavailable

Wednesday UV 7,0High —Unavailable

Hourly UV index today

11:00 AMUV 5,5 12:00 PMUV 7,3 1:00 PMUV 8,2 2:00 PMUV 7,7 3:00 PMUV 6,1 4:00 PMUV 3,8 5:00 PMUV 0,9 6:00 PMUV 0,5 7:00 PMUV 0,0

Today's weather health advice Open today's recommendations.

Very high UV risk

Use SPF 50+ sunscreen, a hat and sunglasses. Seek shade and limit exposure around midday.

Good air quality

Air quality is good and outdoor activities can be enjoyed normally.

Stay hydrated

Drink water regularly, especially during physical activity or prolonged sun exposure.

Best in the morning or late in the day

For walking, running or cycling, prefer the early morning or late afternoon.

WIND OUTLOOK

Hourly Wind Forecast for Herndon

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

Internal PR simulation: 4.47 Population: 24,672

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Forecast data for Herndon were last refreshed today at 10:57 AM. The current forecast period extends through 05/09/2026 at 8:00 AM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.