Herndon, VA 20171 Hourly Weather

Fairfax County7:08 PM EDT38.93°N, 77.39°W

Next 48 hours

7 PM 10 PM Wed Oct 21 1 AM 4 AM 7 AM 10 AM 1 PM 4 PM 7 PM 10 PM Thu Oct 22 1 AM 4 AM 7 AM 10 AM 1 PM 4 PM 40° 45° 50° 55° 60° 65° %
TemperatureFeels likeChance of precipitationNight
Tuesday, October 205 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
7 PM Clear 62° 62° 0% 0.00 in N 8 G16 58% 47° 0% 0
8 PM Clear 59° 59° 0% 0.00 in N 8 G16 67% 48° 1% 0
9 PM Clear 57° 57° 0% 0.00 in N 8 G16 75% 49° 1% 0
10 PM Clear 56° 56° 0% 0.00 in N 7 G15 74% 48° 2% 0
11 PM Clear 55° 55° 0% 0.00 in N 7 G14 77% 48° 2% 0
Wednesday, October 2124 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Clear 53° 53° 0% 0.00 in N 7 G14 83% 48° 2% 0
1 AM Clear 52° 52° 0% 0.00 in N 6 G13 83% 47° 1% 0
2 AM Clear 51° 51° 0% 0.00 in N 6 G13 83% 46° 2% 0
3 AM Clear 50° 48° 0% 0.00 in N 6 G13 83% 45° 1% 0
4 AM Clear 49° 47° 0% 0.00 in N 6 G13 83% 44° 2% 0
5 AM Clear 48° 45° 0% 0.00 in N 6 G13 83% 43° 4% 0
6 AM Sunny 46° 42° 0% 0.00 in N 7 G14 89% 43° 5% 0
7 AM Sunny 45° 41° 0% 0.00 in N 7 G14 89% 42° 14% 0
8 AM Sunny 46° 42° 0% 0.00 in N 7 G14 86% 42° 18% 0
9 AM Sunny 49° 46° 0% 0.00 in N 7 G16 80% 43° 9% 1
10 AM Sunny 53° 53° 0% 0.00 in N 8 G16 69% 43° 13% 2
11 AM Sunny 57° 57° 0% 0.00 in N 8 G15 59% 43° 14% 3
12 PM Sunny 60° 60° 0% 0.00 in N 8 G15 53% 43° 8% 4
1 PM Sunny 60° 60° 0% 0.00 in N 9 G15 53% 43° 10% 5
2 PM Sunny 63° 63° 0% 0.00 in N 9 G16 46% 42° 13% 4
3 PM Sunny 63° 63° 0% 0.00 in N 9 G16 46% 42° 3% 3
4 PM Sunny 63° 63° 0% 0.00 in N 9 G16 46% 42° 2% 1
5 PM Sunny 61° 61° 0% 0.00 in N 8 G16 49% 42° 3% 0
6 PM Clear 59° 59° 0% 0.00 in N 6 G13 55% 43° 1% 0
7 PM Clear 56° 56° 0% 0.00 in N 6 G12 59% 42° 4% 0
8 PM Mostly Clear 53° 53° 0% 0.00 in N 5 74% 45° 6% 0
9 PM Mostly Clear 51° 51° 0% 0.00 in N 3 G8 83% 46° 10% 0
10 PM Mostly Clear 49° 48° 0% 0.00 in N 3 89% 46° 8% 0
11 PM Mostly Clear 48° 47° 0% 0.00 in N 3 96% 47° 6% 0
Thursday, October 2224 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Mostly Clear 47° 46° 0% 0.00 in N 3 G8 96% 46° 6% 0
1 AM Clear 46° 44° 0% 0.00 in NW 5 100% 46° 5% 0
2 AM Clear 46° 44° 0% 0.00 in NW 5 G10 96% 45° 5% 0
3 AM Mostly Clear 45° 43° 0% 0.00 in NW 5 G10 96% 44° 7% 0
4 AM Mostly Clear 45° 42° 0% 0.00 in NW 6 G12 96% 44° 10% 0
5 AM Mostly Clear 44° 41° 0% 0.00 in NW 6 G12 96% 43° 12% 0
6 AM Sunny 44° 41° 0% 0.00 in NW 6 G13 93% 42° 11% 0
7 AM Sunny 43° 39° 0% 0.00 in NW 7 G14 93% 41° 10% 0
8 AM Sunny 44° 40° 0% 0.00 in NW 7 G15 89% 41° 9% 0
9 AM Sunny 48° 44° 0% 0.00 in NW 8 G16 80% 42° 7% 1
10 AM Sunny 52° 52° 0% 0.00 in NW 8 G16 69% 42° 6% 2
11 AM Sunny 56° 56° 0% 0.00 in NW 9 G17 62% 43° 4% 3
12 PM Sunny 59° 59° 0% 0.00 in NW 10 G18 55% 43° 4% 4
1 PM Sunny 62° 62° 0% 0.00 in N 10 G18 48% 42° 3% 4
2 PM Sunny 64° 64° 0% 0.00 in N 10 G18 45% 42° 3% 4
3 PM Sunny 65° 65° 0% 0.00 in N 10 G18 45% 43° 3% 3
4 PM Sunny 65° 65° 0% 0.00 in N 9 G18 46% 44° 3% 1
5 PM Sunny 64° 64° 0% 0.00 in N 8 G17 52% 46° 3% 0
6 PM Clear 62° 62° 0% 0.00 in N 7 G16 60% 48° 3% 0
7 PM Clear 59° 59° 0% 0.00 in N 7 G14 69% 49° 3% 0
8 PM Clear 57° 57° 0% 0.00 in N 6 G13 77% 50° 3% 0
9 PM Clear 56° 56° 0% 0.00 in N 6 G13 80% 50° 4% 0
10 PM Clear 55° 55° 0% 0.00 in N 6 G13 83% 50° 4% 0
11 PM Clear 54° 54° 0% 0.00 in N 6 G13 86% 50° 5% 0
Friday, October 2324 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Mostly Clear 53° 53° 0% 0.00 in N 7 G14 86% 49° 6% 0
1 AM Mostly Clear 52° 52° 0% 0.00 in N 7 G15 89% 49° 6% 0
2 AM Mostly Clear 51° 51° 0% 0.00 in N 8 G16 89% 48° 7% 0
3 AM Mostly Clear 50° 47° 0% 0.00 in N 8 G16 89% 47° 9% –
4 AM Mostly Clear 49° 46° 0% 0.00 in N 8 G16 93% 47° 10% –
5 AM Mostly Clear 47° 43° 0% 0.00 in N 8 G16 96% 46° 12% –
6 AM Sunny 46° 42° 0% 0.00 in N 8 G16 96% 45° 10% –
7 AM Sunny 45° 41° 0% 0.00 in N 8 G15 100% 45° 8% –
8 AM Sunny 45° 41° 0% 0.00 in N 8 G15 96% 44° 6% –
9 AM Sunny 47° 43° 0% 0.00 in N 8 G15 86% 43° 5% –
10 AM Sunny 49° 45° 0% 0.00 in N 9 G16 77% 42° 4% –
11 AM Sunny 52° 52° 0% 0.00 in N 9 G16 66% 41° 3% –
12 PM Sunny 54° 54° 0% 0.00 in N 9 G16 59% 40° 3% –
1 PM Sunny 56° 56° 0% 0.00 in N 9 G15 53% 39° 2% –
2 PM Sunny 57° 57° 0% 0.00 in N 8 G14 51% 39° 2% –
3 PM Sunny 57° 57° 0% 0.00 in N 7 G13 51% 39° 2% –
4 PM Sunny 57° 57° 0% 0.00 in N 7 G13 51% 39° 2% –
5 PM Sunny 56° 56° 0% 0.00 in N 6 G12 53% 39° 2% –
6 PM Clear 54° 54° 0% 0.00 in NE 5 G10 59% 40° 2% –
7 PM Clear 51° 51° 0% 0.00 in NE 5 71% 42° 2% –
8 PM Clear 49° 48° 0% – NE 3 80% 43° 2% –
9 PM Clear 48° 48° 0% – NE 2 86% 44° 2% –
10 PM Clear 46° 46° 0% – NE 1 93% 44° 2% –
11 PM Clear 45° 45° 0% – NE 1 96% 44° 2% –
Saturday, October 2424 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Clear 44° 44° 0% – NE 1 100% 44° 2% –
1 AM Clear 43° 43° 0% – NE 1 100% 43° 2% –
2 AM Clear 42° 42° 0% – N 1 100% 42° 5% –
3 AM Clear 41° 41° 0% – N 1 100% 41° 5% –
4 AM Clear 40° 40° 0% – N 2 100% 40° 5% –
5 AM Clear 40° 40° 0% – N 2 100% 40° 5% –
6 AM Sunny 39° 39° 0% – N 2 100% 39° 5% –
7 AM Sunny 39° 39° 0% – N 2 100% 39° 5% –
8 AM Sunny 40° 40° 0% – N 2 100% 40° 3% –
9 AM Sunny 43° 43° 0% – N 2 96% 42° 3% –
10 AM Sunny 48° 48° 0% – NE 2 86% 44° 3% –
11 AM Sunny 52° 52° 0% – NE 2 80% 46° 3% –
12 PM Sunny 55° 55° 0% – E 2 69% 45° 3% –
1 PM Sunny 57° 57° 0% – SE 2 62% 44° 3% –
2 PM Sunny 58° 58° 0% – SE 2 57% 43° 2% –
3 PM Sunny 59° 59° 0% – SE 2 55% 43° 2% –
4 PM Sunny 60° 60° 0% – SE 2 55% 44° 2% –
5 PM Sunny 59° 59° 0% – SE 2 60% 45° 2% –
6 PM Clear 57° 57° 0% – SE 2 69% 47° 2% –
7 PM Clear 54° 54° 0% – SE 2 80% 48° 2% –
8 PM Mostly Clear 51° 51° 0% – SE 2 93% 49° 6% –
9 PM Mostly Clear 49° 49° 0% – SE 1 100% 49° 6% –
10 PM Mostly Clear 48° 48° 0% – SE 1 100% 48° 6% –
11 PM Mostly Clear 47° 47° 0% – Calm 100% 47° 6% –
Sunday, October 2524 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Mostly Clear 46° 46° 0% – Calm 100% 46° 6% –
1 AM Mostly Clear 46° 46° 0% – Calm 100% 46° 6% –
2 AM Mostly Clear 45° 45° 0% – Calm 100% 45° 7% –
3 AM Mostly Clear 44° 44° 0% – Calm 100% 44° 7% –
4 AM Mostly Clear 44° 44° 0% – W 1 100% 44° 7% –
5 AM Mostly Clear 43° 43° 0% – NW 1 100% 43° 7% –
6 AM Sunny 42° 42° 0% – NW 1 100% 42° 7% –
7 AM Sunny 41° 41° 0% – NW 1 100% 41° 7% –
8 AM Sunny 42° 42° 0% – NW 1 100% 42° 16% –
9 AM Sunny 46° 46° 0% – W 1 93% 44° 16% –
10 AM Sunny 50° 50° 0% – SW 1 93% 48° 16% –
11 AM Sunny 55° 55° 0% – S 1 83% 50° 16% –
12 PM Sunny 58° 58° 0% – S 1 75% 50° 16% –
1 PM Sunny 60° 60° 0% – S 2 67% 49° 16% –
2 PM Sunny 62° 62° 0% – S 2 60% 48° 7% –
3 PM Sunny 63° 63° 0% – S 2 58% 48° 7% –
4 PM Sunny 64° 64° 0% – S 2 56% 48° 7% –
5 PM Sunny 63° 63° 0% – S 2 60% 49° 7% –
6 PM Mostly Clear 61° 61° 0% – S 2 67% 50° 7% –
7 PM Mostly Clear 57° 57° 0% – S 2 80% 51° 7% –
8 PM Mostly Clear 54° 54° 0% – S 2 93% 52° 11% –
9 PM Mostly Clear 52° 52° 0% – S 2 100% 52° 11% –
10 PM Mostly Clear 51° 51° 0% – S 1 100% 51° 11% –
11 PM Mostly Clear 50° 50° 0% – S 1 100% 50° 11% –
Monday, October 2624 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Mostly Clear 49° 49° 0% – S 1 100% 49° 11% –
1 AM Mostly Clear 48° 48° 0% – SW 1 100% 48° 11% –
2 AM Mostly Clear 47° 47° 0% – SW 1 100% 47° 16% –
3 AM Mostly Clear 47° 47° 0% – SW 1 100% 47° 16% –
4 AM Mostly Clear 46° 46° 0% – W 1 100% 46° 16% –
5 AM Mostly Clear 46° 46° 0% – W 1 100% 46° 16% –
6 AM Sunny 45° 45° 0% – W 1 100% 45° 16% –
7 AM Sunny 44° 44° 0% – W 2 100% 44° 16% –
8 AM Sunny 45° 45° 0% – W 2 100% 45° 23% –
9 AM Sunny 48° 48° 0% – W 2 96% 47° 23% –
10 AM Sunny 52° 52° 0% – W 2 89% 49° 23% –
11 AM Sunny 57° 57° 0% – W 2 80% 51° 23% –
12 PM Sunny 61° 61° 0% – W 2 72% 52° 23% –
1 PM Sunny 64° 64° 0% – W 3 65% 52° 23% –
2 PM Sunny 67° 67° 0% – W 3 59% 52° 17% –
3 PM Sunny 69° 69° 0% – W 3 55% 52° 17% –
4 PM Sunny 69° 69° 0% – W 3 57% 53° 17% –
5 PM Sunny 68° 68° 0% – W 3 59% 53° 17% –
6 PM Mostly Clear 66° 66° 0% – W 3 65% 54° 17% –
7 PM Mostly Clear 62° 62° 0% – W 2 78% 55° 17% –
8 PM Partly Cloudy 59° 59° 0% – W 2 87% 55° 31% –
9 PM Partly Cloudy 57° 57° 0% – W 2 93% 55° 31% –
10 PM Partly Cloudy 55° 55° 0% – W 2 100% 55° 31% –
11 PM Partly Cloudy 54° 54° 0% – W 2 100% 54° 31% –
Tuesday, October 272 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Partly Cloudy 53° 53° 0% – W 2 100% 53° 31% –
1 AM Partly Cloudy 52° 52° 0% – W 3 100% 52° 31% –

National Weather Service forecast updated 4 hrs ago. Precipitation amounts are the forecast liquid equivalent for each hour.

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Search index and reflects what the press published. Terms of use.