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United States / Virginia

in Herndon partly cloudy, no precipitation, +27 °C

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3 days

Weekend 7 days 10 days 2 weeks Month

Herndon 3-Day Weather Forecast

Mo, 29 April Tu, 30 April We, 1 May Th, 2 May Fr, 3 May Sa, 4 May Su, 5 May Mo, 6 May Tu, 7 May We, 8 May

Overnight

Morning

Afternoon

Evening

Overnight

Morning

Afternoon

Evening

Overnight

Morning

Afternoon

Evening

Overnight

Morning

Afternoon

Evening

Overnight

Morning

Afternoon

Evening

Overnight

Morning

Afternoon

Evening

Overnight

Morning

Afternoon

Evening

Overnight

Morning

Afternoon

Evening

Overnight

Morning

Afternoon

Evening

Overnight

Morning

Afternoon

Evening

Air temperature, °C

+18

+17

+32

+27

+19

+18

+30

+27

+20

+22

+25

+19

+17

+17

+27

+22

+15

+21

+28

+22

+15

+18

+18

+16

+14

+15

+19

+18

+17

+20

+24

+21

+15

+18

+22

+18

+10

+14

+18

+16

Real feel, °C

+19

+22

+32

+27

+19

+21

+30

+27

+20

+22

+25

+23

+17

+19

+27

+22

+15

+21

+28

+22

+15

+16

+18

+16

+14

+15

+19

+18

+17

+20

+24

+21

+15

+18

+22

+18

+9

+14

+18

+16

Average wind speed, m/s

3

2

3

2

3

4

5

4

2

3

4

2

1

2

3

2

1

3

4

4

3

2

4

2

2

3

3

2

2

3

5

3

3

6

6

2

3

6

7

3

Wind gusts, m/s

—

—

7

5

6

8

10

10

8

8

9

7

3

6

6

6

2

6

10

11

10

6

7

6

4

6

7

5

6

9

11

10

10

10

11

9

9

9

11

10

Wind direction

S

S

W

SE

S

SW

SW

SW

SW

N

NW

N

E

NE

E

SE

SE

SE

SE

E

E

E

NE

E

E

E

SE

E

S

S

SW

W

W

W

W

NW

NW

NW

NW

N

Birch pollen, points

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Grass pollen, points

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Ragweed pollen, points

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Precipitation in liquid equivalent, mm

0

0

0

0

0

0

0

0

0

0

1.1

0

0

0

0

0

0

0

0

0

0

0.8

17.4

5.8

2.9

1.7

0.2

0

0

0.1

5.1

1.9

0

0

0

0

0

0

0

0

Falling snow, cm

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Snow depth, cm

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

—

—

—

—

—

—

—

—

—

—

Pressure, mmHg

753

755

752

750

751

750

747

747

747

749

750

751

751

754

753

753

753

754

752

754

755

756

756

756

756

757

754

751

749

747

743

744

745

747

746

747

748

749

749

750

Relative humidity, %

67

66

37

47

61

61

40

41

62

67

55

63

85

79

46

59

78

66

42

56

77

71

66

77

83

77

64

75

83

70

61

64

68

56

44

49

61

52

38

46

UV Index, points

0

4

10

1

0

6

11

1

0

3

3

1

0

2

10

0

0

3

11

0

0

0

0

0

0

0

0

0

0

0

1

1

0

3

6

3

0

4

5

2

Geomagnetic activity, Kp-index

3

3

4

4

4

4

4

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

2

2

2

2

2

2

2

2

2

2

2

2

2

Washington Dulles

Fairfax Station

Montgomery Village

Montgomery County

Weather in Herndon for 3 days is provided for personal non-commercial use only.

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