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Current weather in Herndon is clear sky.

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 · 12:18 AM

Herndon Weather & Hourly Forecast

United States · Virginia · 20170

76°F

Clear night

Feels like: 74°F

💧 Humidity 61% 🌡 Pressure 30.00 inHg 💨 Wind 12 mph 👁 Visibility 21.8 mi ☁ Clouds 0% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Herndon

Today

1:00 AM

Clear night

76° 💧 None 💨 12 mph H 61%30.00 inHg

4:00 AM

Clear night

74° 💧 0.001 in 💨 9 mph H 69%29.94 inHg

7:00 AM

Light rain

71° 💧 0.044 in 💨 6 mph H 85%29.97 inHg

10:00 AM

Partly cloudy

78° 💧 0.000 in 💨 5 mph H 74%29.97 inHg

1:00 PM

Overcast

85° 💧 None 💨 6 mph H 58%29.94 inHg

4:00 PM

Mostly cloudy

88° 💧 0.001 in 💨 6 mph H 53%29.88 inHg

7:00 PM

Light rain

81° 💧 0.010 in 💨 6 mph H 70%29.88 inHg

10:00 PM

Mostly clear night

75° 💧 0.033 in 💨 7 mph H 90%29.91 inHg

Tomorrow

1:00 AM

Light thunderstorms

72° 💧 0.199 in 💨 5 mph H 98%29.91 inHg

4:00 AM

Light rain

71° 💧 0.102 in 💨 5 mph H 97%29.88 inHg

7:00 AM

Light rain

69° 💧 0.013 in 💨 5 mph H 97%29.94 inHg

10:00 AM

Mostly sunny

74° 💧 None 💨 7 mph H 78%29.97 inHg

1:00 PM

Mostly cloudy

81° 💧 0.000 in 💨 6 mph H 54%29.97 inHg

4:00 PM

Mostly sunny

83° 💧 None 💨 6 mph H 48%29.94 inHg

7:00 PM

Sunny

78° 💧 None 💨 3 mph H 61%29.94 inHg

10:00 PM

Partly cloudy night

72° 💧 None 💨 4 mph H 76%30.03 inHg

Today

1:00 AM

Clear night

76° 💧 None 💨 12 mph H 61%30.00 inHg

2:00 AM

Clear night

75° 💧 None 💨 11 mph H 63%29.97 inHg

3:00 AM

Clear night

75° 💧 None 💨 10 mph H 66%29.94 inHg

4:00 AM

Clear night

74° 💧 None 💨 9 mph H 69%29.94 inHg

5:00 AM

Mostly clear night

73° 💧 None 💨 7 mph H 73%29.97 inHg

6:00 AM

Partly cloudy night

72° 💧 0.001 in 💨 5 mph H 77%29.97 inHg

7:00 AM

Light rain

71° 💧 0.027 in 💨 6 mph H 85%29.97 inHg

8:00 AM

Light rain

72° 💧 0.016 in 💨 6 mph H 89%29.97 inHg

9:00 AM

Mostly cloudy

76° 💧 0.000 in 💨 4 mph H 82%29.97 inHg

10:00 AM

Partly cloudy

78° 💧 None 💨 5 mph H 74%29.97 inHg

11:00 AM

Overcast

83° 💧 0.000 in 💨 8 mph H 63%29.97 inHg

12:00 PM

Mostly cloudy

83° 💧 None 💨 7 mph H 62%29.97 inHg

1:00 PM

Overcast

85° 💧 None 💨 6 mph H 58%29.94 inHg

2:00 PM

Overcast

86° 💧 None 💨 7 mph H 57%29.91 inHg

3:00 PM

Partly cloudy

86° 💧 None 💨 6 mph H 56%29.88 inHg

4:00 PM

Mostly cloudy

88° 💧 0.000 in 💨 6 mph H 53%29.88 inHg

5:00 PM

Mostly cloudy

88° 💧 0.000 in 💨 6 mph H 53%29.85 inHg

6:00 PM

Partly cloudy

87° 💧 None 💨 4 mph H 53%29.85 inHg

7:00 PM

Light rain

81° 💧 0.007 in 💨 6 mph H 70%29.88 inHg

8:00 PM

Mostly clear night

77° 💧 0.002 in 💨 6 mph H 85%29.88 inHg

9:00 PM

Mostly clear night

76° 💧 0.000 in 💨 3 mph H 88%29.88 inHg

10:00 PM

Mostly clear night

75° 💧 None 💨 7 mph H 90%29.91 inHg

11:00 PM

Partly cloudy night

75° 💧 0.000 in 💨 5 mph H 91%29.91 inHg

Tomorrow

12:00 AM

Light rain

74° 💧 0.032 in 💨 8 mph H 95%29.91 inHg

1:00 AM

Light thunderstorms

72° 💧 0.069 in 💨 5 mph H 98%29.91 inHg

2:00 AM

Light thunderstorms

72° 💧 0.070 in 💨 6 mph H 98%29.91 inHg

3:00 AM

Light rain

72° 💧 0.059 in 💨 5 mph H 97%29.88 inHg

4:00 AM

Light rain

71° 💧 0.042 in 💨 5 mph H 97%29.88 inHg

5:00 AM

Light rain

70° 💧 0.044 in 💨 6 mph H 96%29.91 inHg

6:00 AM

Light rain

70° 💧 0.015 in 💨 6 mph H 96%29.91 inHg

7:00 AM

Light rain

69° 💧 0.013 in 💨 5 mph H 97%29.94 inHg

8:00 AM

Mostly cloudy

70° 💧 0.000 in 💨 5 mph H 96%29.97 inHg

9:00 AM

Mostly cloudy

72° 💧 None 💨 6 mph H 88%29.97 inHg

10:00 AM

Mostly sunny

74° 💧 None 💨 7 mph H 78%29.97 inHg

11:00 AM

Mostly cloudy

77° 💧 None 💨 7 mph H 65%30.00 inHg

12:00 PM

Mostly cloudy

79° 💧 None 💨 6 mph H 59%30.00 inHg

1:00 PM

Mostly cloudy

81° 💧 None 💨 6 mph H 54%29.97 inHg

2:00 PM

Mostly cloudy

83° 💧 0.000 in 💨 5 mph H 50%29.97 inHg

3:00 PM

Mostly cloudy

83° 💧 None 💨 6 mph H 49%29.94 inHg

4:00 PM

Mostly sunny

83° 💧 None 💨 6 mph H 48%29.94 inHg

5:00 PM

Sunny

82° 💧 None 💨 6 mph H 50%29.94 inHg

6:00 PM

Sunny

81° 💧 None 💨 4 mph H 52%29.94 inHg

7:00 PM

Sunny

78° 💧 None 💨 3 mph H 61%29.94 inHg

8:00 PM

Mostly clear night

75° 💧 None 💨 4 mph H 66%29.97 inHg

9:00 PM

Partly cloudy night

73° 💧 None 💨 4 mph H 69%30.00 inHg

10:00 PM

Partly cloudy night

72° 💧 None 💨 4 mph H 76%30.03 inHg

11:00 PM

Mostly cloudy night

71° 💧 None 💨 4 mph H 84%30.03 inHg

Saturday

12:00 AM

Mostly cloudy night

70° 💧 None 💨 4 mph H 86%30.03 inHg

1:00 AM

Mostly cloudy night

70° 💧 None 💨 4 mph H 85%30.03 inHg

2:00 AM

Partly cloudy night

69° 💧 None 💨 4 mph H 86%30.03 inHg

3:00 AM

Mostly cloudy night

69° 💧 None 💨 4 mph H 87%30.03 inHg

4:00 AM

Mostly cloudy night

68° 💧 None 💨 4 mph H 90%30.03 inHg

5:00 AM

Mostly cloudy night

68° 💧 None 💨 4 mph H 93%30.03 inHg

6:00 AM

Overcast night

68° 💧 None 💨 4 mph H 95%30.06 inHg

7:00 AM

Overcast

68° 💧 None 💨 4 mph H 96%30.06 inHg

8:00 AM

Overcast

70° 💧 None 💨 4 mph H 92%30.09 inHg

5:00 PM

Overcast

80° 💧 None 💨 8 mph H 64%29.97 inHg

8:00 PM

Overcast night

77° 💧 None 💨 9 mph H 75%30.00 inHg

11:00 PM

Overcast night

73° 💧 None 💨 5 mph H 94%30.03 inHg

Sunday

2:00 AM

Mostly clear night

72° 💧 None 💨 4 mph H 97%30.00 inHg

5:00 AM

Mostly cloudy night

70° 💧 None 💨 4 mph H 99%29.97 inHg

8:00 AM

Overcast

71° 💧 None 💨 4 mph H 98%30.00 inHg

11:00 AM

Light rain

73° 💧 None 💨 2 mph H 92%30.00 inHg

2:00 PM

Overcast

82° 💧 None 💨 4 mph H 70%29.94 inHg

5:00 PM

Light rain

84° 💧 None 💨 3 mph H 67%29.91 inHg

8:00 PM

Mostly clear night

77° 💧 None 💨 3 mph H 88%29.91 inHg

11:00 PM

Clear night

73° 💧 None 💨 5 mph H 92%29.97 inHg

Monday

2:00 AM

Clear night

73° 💧 None 💨 8 mph H 85%29.97 inHg

5:00 AM

Clear night

70° 💧 None 💨 9 mph H 90%30.00 inHg

8:00 AM

Sunny

68° 💧 None 💨 4 mph H 88%30.09 inHg

11:00 AM

Sunny

76° 💧 None 💨 6 mph H 54%30.15 inHg

2:00 PM

Mostly sunny

80° 💧 None 💨 6 mph H 48%30.12 inHg

5:00 PM

Partly cloudy

80° 💧 None 💨 5 mph H 46%30.09 inHg

8:00 PM

Mostly cloudy night

73° 💧 None 💨 2 mph H 65%30.12 inHg

11:00 PM

Partly cloudy night

69° 💧 None 💨 6 mph H 71%30.18 inHg

Tuesday

2:00 AM

Clear night

65° 💧 None 💨 1 mph H 74%30.21 inHg

5:00 AM

Clear night

62° 💧 None 💨 4 mph H 82%30.24 inHg

8:00 AM

Mostly sunny

64° 💧 None 💨 4 mph H 78%30.27 inHg

11:00 AM

Mostly sunny

75° 💧 None 💨 6 mph H 51%30.30 inHg

2:00 PM

Partly cloudy

83° 💧 None 💨 7 mph H 44%30.24 inHg

8:00 PM

Mostly clear night

93° 💧 None 💨 7 mph H 40%30.09 inHg

Wednesday

2:00 AM

Clear night

83° 💧 None 💨 10 mph H 61%30.09 inHg

8:00 AM

Sunny

74° 💧 None 💨 7 mph H 84%30.12 inHg

2:00 PM

Sunny

74° 💧 None 💨 4 mph H 87%30.15 inHg

8:00 PM

Mostly clear night

93° 💧 None 💨 3 mph H 43%30.09 inHg

Thursday

2:00 AM

Partly cloudy night

79° 💧 None 💨 6 mph H 80%30.09 inHg

8:00 AM

Mostly sunny

75° 💧 None 💨 1 mph H 92%30.12 inHg

2:00 PM

Mostly sunny

75° 💧 None 💨 3 mph H 87%30.12 inHg

8:00 PM

Overcast night

94° 💧 None 💨 8 mph H 43%30.00 inHg

Friday

2:00 AM

Light rain

80° 💧 None 💨 0 mph H 85%29.94 inHg

8:00 AM

Partly cloudy

76° 💧 None 💨 10 mph H 81%29.88 inHg

2:00 PM

Mostly cloudy

75° 💧 None 💨 4 mph H 81%29.83 inHg

8:00 PM

Mostly cloudy night

69° 💧 None 💨 11 mph H 75%29.91 inHg

Saturday

2:00 AM

Mostly cloudy night

71° 💧 None 💨 6 mph H 66%29.94 inHg

8:00 AM

Overcast

64° 💧 None 💨 5 mph H 82%29.97 inHg

2:00 PM

Overcast

61° 💧 None 💨 4 mph H 85%30.00 inHg

8:00 PM

Overcast night

75° 💧 None 💨 5 mph H 44%29.94 inHg

Sunday

2:00 AM

Overcast night

69° 💧 None 💨 3 mph H 59%29.91 inHg

8:00 AM

Overcast

62° 💧 None 💨 3 mph H 84%29.91 inHg

2:00 PM

Overcast

62° 💧 None 💨 6 mph H 82%29.97 inHg

8:00 PM

Mostly cloudy night

77° 💧 None 💨 10 mph H 41%29.94 inHg

Monday

2:00 AM

Overcast night

69° 💧 None 💨 9 mph H 58%30.00 inHg

8:00 AM

Mostly cloudy

59° 💧 None 💨 11 mph H 62%30.09 inHg

2:00 PM

Overcast

53° 💧 None 💨 9 mph H 63%30.18 inHg

8:00 PM

Mostly clear night

69° 💧 None 💨 12 mph H 38%30.15 inHg

Tuesday

2:00 AM

Clear night

61° 💧 None 💨 12 mph H 44%30.24 inHg

8:00 AM

Sunny

54° 💧 None 💨 10 mph H 57%30.33 inHg

2:00 PM

Sunny

50° 💧 None 💨 9 mph H 63%30.39 inHg

8:00 PM

Clear night

68° 💧 None 💨 10 mph H 26%30.36 inHg

Wednesday

2:00 AM

Clear night

61° 💧 None 💨 8 mph H 40%30.36 inHg

8:00 AM

Mostly cloudy

55° 💧 None 💨 7 mph H 56%30.42 inHg

2:00 PM

Partly cloudy

54° 💧 None 💨 7 mph H 58%30.45 inHg

8:00 PM

Mostly cloudy night

70° 💧 None 💨 10 mph H 35%30.36 inHg

Thursday

2:00 AM

Mostly clear night

63° 💧 None 💨 9 mph H 51%30.33 inHg

8:00 AM

Mostly sunny

56° 💧 None 💨 4 mph H 76%30.33 inHg

2:00 PM

Mostly cloudy

54° 💧 None 💨 5 mph H 72%30.30 inHg

In Herndon and, more broadly, across the state of Virginia: The evening will be mostly sunny with a few clouds, and temperatures will remain mild to warm, ranging from 80 to 85 degrees Fahrenheit. Winds will be light, coming from the south at around 6 mph, with occasional gusts up to 20 mph. No precipitation is expected during the next few hours, so it should remain dry and comfortable. The gentle breeze will add a slight cooling effect as the evening progresses. Temperatures are likely to stay steady through the night, making for a pleasant end to the day.

15-Day Weather Outlook for Herndon

TomorrowTomorrow

Light thunderstorms 83°/69° 💧 None 💨 8 mph

Saturday, Sep 12Sat Sep 12

Mostly sunny 80°/68° 💧 0.512 in 💨 8 mph

Sunday, Sep 13Sun Sep 13

Light rain 84°/70° 💧 0.083 in 💨 9 mph

Monday, Sep 14Mon Sep 14

Mostly sunny 80°/68° 💧 0.009 in 💨 9 mph

Tuesday, Sep 15Tue Sep 15

Mostly cloudy 83°/62° 💧 None 💨 7 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 93°/74° 💧 None 💨 10 mph

Thursday, Sep 17Thu Sep 17

Mostly sunny 93°/75° 💧 0.019 in 💨 6 mph

Friday, Sep 18Fri Sep 18

Light rain 94°/75° 💧 0.154 in 💨 10 mph

Saturday, Sep 19Sat Sep 19

Mostly cloudy 71°/61° 💧 0.115 in 💨 11 mph

Sunday, Sep 20Sun Sep 20

Overcast 75°/62° 💧 None 💨 6 mph

Monday, Sep 21Mon Sep 21

Mostly cloudy 77°/53° 💧 None 💨 11 mph

Tuesday, Sep 22Tue Sep 22

Mostly sunny 69°/50° 💧 None 💨 12 mph

Wednesday, Sep 23Wed Sep 23

Mostly cloudy 68°/54° 💧 None 💨 10 mph

Thursday, Sep 24Thu Sep 24

Mostly cloudy 70°/54° 💧 None 💨 10 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

Fair

Nearest forecast value 1:00 AM

PM2.5 Fine particles Good 4,2µg/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 6,8µg/m³

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

O₃ Ozone Fair 78,7µg/m³

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

NO₂ Nitrogen dioxide Good 1,8µg/m³

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

Air quality is acceptable for most people.

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 6,6High 🙂Fair

Tomorrow UV 6,1High 🙂Fair

Saturday UV 5,0Moderate 🙂Fair

Sunday UV 7,0High 🙂Fair

Monday UV 8,0Very high —Unavailable

Tuesday UV 8,0Very high —Unavailable

Wednesday UV 8,0Very high —Unavailable

Hourly UV index today

7:00 AMUV 0,0 8:00 AMUV 0,4 9:00 AMUV 0,9 10:00 AMUV 0,6 11:00 AMUV 0,9 12:00 PMUV 6,2 1:00 PMUV 6,3 2:00 PMUV 6,6 3:00 PMUV 4,2 4:00 PMUV 2,0 5:00 PMUV 1,2 6:00 PMUV 0,5

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

Strong UV exposure

Protect exposed skin with SPF 30+ sunscreen, wear sunglasses, and try to limit direct midday sun.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

Good conditions for outdoor activities

Outdoor activities can generally be enjoyed normally, with sun protection adjusted to the UV level.

WIND OUTLOOK

Hourly Wind Forecast for Herndon

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · HERNDON, VIRGINIA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 3:00 AM–4:00 AM.

99/100Best-hour score

BEST TIME TONIGHT 3:00 AM–4:00 AM Astronomical darkness: 8:59 PM–5:15 AM

☁ Cloud cover 2% Real hourly forecast for the best viewing hour.

☾ Moonlight 3% New Moon · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 66° high at the best hour.

✦ Estimated visible meteors 2–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min78%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

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Forecast data for Herndon were last refreshed today at 12:18 AM. The current forecast period extends through 11/09/2026 at 10:00 PM. 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.