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in Herndon mainly cloudy, no precipitation, +15 °C

Herndon 3-Day Weather Forecast

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

+6
+11
+18
+15
+15
+16
+19
+6
+2
+2
+9
+1
−2
+3
+12
+9
+5
+7
+14
+11
+8
+8
+19
+14
+10
+10
+18
+14
+9
+9
+19
+14
+9
+12
+18
+14
+9
+10
+12
+12

Real feel, °C

+6
+10
+18
+15
+15
+16
+19
+10
−1
−1
+7
+4
−2
+2
+12
+8
+5
+6
+14
+11
+8
+10
+19
+14
+10
+12
+18
+14
+9
+12
+19
+14
+9
+12
+18
+14
+9
+10
+12
+11

Average wind speed, m/s

2
6
7
6
5
8
8
7
6
7
6
2
1
4
6
4
1
3
3
2
1
2
2
1
2
2
2
1
2
2
1
1
2
3
2
1
3
2
2

Wind gusts, m/s

12
15
15
12
15
16
18
15
13
14
9
2
9
12
10
3
5
6
5
3
5
4
3
2
5
5
4
2
5
5
3
2
4
5
6
5
5
4
9

Wind direction

S
S
S
S
S
S
S
NW
NW
NW
NW
NW
SE
S
S
SE
SE
N
N
N
N
N
N
E
calm
E
E
E
SE
S
S
E
NE
E
E
E
E
E
SE
S

Precipitation in liquid equivalent, mm

0
0
0.4
0.5
0.6
4.3
4.3
2.2
0
0
0
0
0
0
0
1.2
3.5
1.6
0.1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.3
9.9
3.3
0.7
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
0
0

Pressure, mmHg

753
751
747
747
746
744
741
753
754
762
762
765
765
766
764
762
761
760
758
759
759
761
758
758
758
759
758
756
756
755
756
754
757
756
754
752
751
747
745
745

Relative humidity, %

73
63
52
74
72
73
66
53
39
32
20
29
49
43
27
44
81
80
66
76
82
78
51
65
78
76
54
65
80
75
55
68
82
73
48
66
83
81
71
78
0
2
2
0
0
1
1
0
0
4
5
0
0
4
5
0
0
0
1
0
0
1
2
0
0
1
3
0
0
1
2
0
0
1
2
1
0
0
0
0
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2