Herndon, VA 20170 Hourly Weather

Fairfax County10:27 PM EDT38.98°N, 77.37°W

Next 48 hours

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 7 PM 40° 45° 50° 55° 60° 65° %
TemperatureFeels likeChance of precipitationNight
Tuesday, October 202 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
10 PM Clear 55° 55° 0% 0.00 in N 6 G14 80% 49° 0% 0
11 PM Clear 53° 53° 0% 0.00 in N 6 G14 83% 48° 0% 0
Wednesday, October 2124 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Clear 52° 52° 0% 0.00 in N 6 G13 86% 48° 0% 0
1 AM Clear 51° 51° 0% 0.00 in N 6 G12 86% 47° 0% 0
2 AM Clear 50° 48° 0% 0.00 in N 6 G12 86% 46° 0% 0
3 AM Clear 48° 45° 0% 0.00 in N 6 G12 89% 45° 0% 0
4 AM Clear 47° 44° 0% 0.00 in N 6 G12 89% 44° 0% 0
5 AM Clear 46° 43° 0% 0.00 in N 6 G12 93% 44° 0% 0
6 AM Sunny 45° 42° 0% 0.00 in N 6 G12 93% 43° 0% 0
7 AM Sunny 44° 41° 0% 0.00 in N 6 G12 93% 42° 0% 0
8 AM Sunny 45° 42° 0% 0.00 in N 6 G12 89% 42° 0% 0
9 AM Sunny 48° 45° 0% 0.00 in N 7 G15 83% 43° 0% 1
10 AM Sunny 52° 52° 0% 0.00 in N 7 G15 74% 44° 0% 2
11 AM Sunny 56° 56° 0% 0.00 in N 8 G14 64% 44° 0% 3
12 PM Sunny 59° 59° 0% 0.00 in N 8 G15 55% 43° 0% 4
1 PM Sunny 61° 61° 0% 0.00 in N 9 G15 51% 43° 0% 5
2 PM Sunny 62° 62° 0% 0.00 in N 9 G15 50% 43° 0% 4
3 PM Sunny 62° 62° 0% 0.00 in N 9 G15 48% 42° 0% 3
4 PM Sunny 63° 63° 0% 0.00 in N 9 G16 48% 43° 0% 1
5 PM Sunny 62° 62° 0% 0.00 in N 8 G16 48% 42° 0% 0
6 PM Clear 59° 59° 0% 0.00 in N 6 G12 55% 43° 0% 0
7 PM Clear 56° 56° 0% 0.00 in N 6 G12 62% 43° 0% 0
8 PM Clear 53° 53° 0% 0.00 in N 5 74% 45° 0% 0
9 PM Clear 51° 51° 0% 0.00 in N 3 G8 83% 46° 0% 0
10 PM Clear 49° 48° 0% 0.00 in N 3 89% 46° 0% 0
11 PM Clear 48° 47° 0% 0.00 in N 3 100% 48° 0% 0
Thursday, October 2224 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Clear 47° 46° 0% 0.00 in N 3 100% 47° 0% 0
1 AM Clear 46° 44° 0% 0.00 in NW 5 100% 46° 0% 0
2 AM Clear 45° 43° 0% 0.00 in NW 5 100% 45° 0% 0
3 AM Mostly Clear 44° 41° 0% 0.00 in NW 5 100% 44° 8% 0
4 AM Mostly Clear 44° 41° 0% 0.00 in NW 5 G10 100% 44° 10% 0
5 AM Mostly Clear 43° 40° 0% 0.00 in NW 5 G10 100% 43° 12% 0
6 AM Sunny 42° 38° 0% 0.00 in NW 6 G12 100% 42° 10% 0
7 AM Sunny 42° 38° 0% 0.00 in NW 6 G13 96% 41° 9% 0
8 AM Sunny 43° 39° 0% 0.00 in NW 7 G14 93% 41° 7% 0
9 AM Sunny 47° 43° 0% 0.00 in NW 8 G15 83% 42° 6% 1
10 AM Sunny 51° 51° 0% 0.00 in NW 8 G16 74% 43° 5% 2
11 AM Sunny 56° 56° 0% 0.00 in NW 9 G17 64% 44° 4% 3
12 PM Sunny 59° 59° 0% 0.00 in NW 9 G18 57% 44° 4% 4
1 PM Sunny 62° 62° 0% 0.00 in N 9 G18 50% 43° 4% 4
2 PM Sunny 64° 64° 0% 0.00 in N 9 G18 46% 43° 4% 4
3 PM Sunny 65° 65° 0% 0.00 in N 9 G18 45% 43° 4% 3
4 PM Sunny 65° 65° 0% 0.00 in N 8 G18 46% 44° 3% 1
5 PM Sunny 64° 64° 0% 0.00 in N 8 G17 50% 45° 3% 0
6 PM Clear 62° 62° 0% 0.00 in N 7 G16 58% 47° 3% 0
7 PM Clear 59° 59° 0% 0.00 in N 7 G14 67% 48° 2% 0
8 PM Clear 57° 57° 0% 0.00 in N 6 G13 77% 50° 2% 0
9 PM Clear 55° 55° 0% 0.00 in N 6 G12 86% 51° 3% 0
10 PM Clear 54° 54° 0% 0.00 in N 6 G12 90% 51° 5% 0
11 PM Mostly Clear 53° 53° 0% 0.00 in N 6 G12 93% 51° 6% 0
Friday, October 2324 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Mostly Clear 52° 52° 0% 0.00 in N 6 G13 93% 50° 6% 0
1 AM Mostly Clear 51° 51° 0% 0.00 in N 7 G14 93% 49° 6% 0
2 AM Mostly Clear 50° 47° 0% 0.00 in N 7 G15 93% 48° 6% 0
3 AM Mostly Clear 49° 46° 0% 0.00 in N 7 G15 93% 47° 8% 0
4 AM Mostly Clear 48° 44° 0% 0.00 in N 8 G15 96% 47° 10% 0
5 AM Mostly Clear 47° 43° 0% 0.00 in N 8 G15 96% 46° 12% 0
6 AM Sunny 46° 42° 0% 0.00 in N 8 G15 96% 45° 9% 0
7 AM Sunny 45° 41° 0% 0.00 in N 7 G14 96% 44° 6% 0
8 AM Sunny 45° 41° 0% 0.00 in N 7 G14 93% 43° 3% 0
9 AM Sunny 47° 43° 0% 0.00 in N 8 G15 83% 42° 3% –
10 AM Sunny 49° 46° 0% 0.00 in N 8 G16 77% 42° 4% –
11 AM Sunny 52° 52° 0% 0.00 in N 9 G16 66% 41° 4% –
12 PM Sunny 54° 54° 0% 0.00 in N 9 G15 59% 40° 4% –
1 PM Sunny 56° 56° 0% 0.00 in N 8 G14 55% 40° 3% –
2 PM Sunny 57° 57° 0% 0.00 in N 7 G13 51% 39° 3% –
3 PM Sunny 58° 58° 0% 0.00 in N 7 G13 47% 38° 3% –
4 PM Sunny 58° 58° 0% 0.00 in N 6 G12 47% 38° 2% –
5 PM Sunny 57° 57° 0% 0.00 in N 6 G12 49% 38° 2% –
6 PM Clear 55° 55° 0% 0.00 in NE 5 G10 55% 39° 2% –
7 PM Clear 52° 52° 0% 0.00 in NE 5 66% 41° 2% –
8 PM Clear 49° 48° 0% – NE 3 83% 44° 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 96% 43° 2% –
1 AM Clear 43° 43° 0% – NE 1 100% 43° 2% –
2 AM Mostly Clear 42° 42° 0% – N 1 100% 42° 6% –
3 AM Mostly Clear 41° 41° 0% – N 1 100% 41° 6% –
4 AM Mostly Clear 40° 40° 0% – N 2 100% 40° 6% –
5 AM Mostly Clear 40° 40° 0% – N 2 100% 40° 6% –
6 AM Sunny 39° 39° 0% – N 2 100% 39° 6% –
7 AM Sunny 39° 39° 0% – N 2 100% 39° 6% –
8 AM Sunny 40° 40° 0% – N 2 96% 39° 1% –
9 AM Sunny 43° 43° 0% – N 2 93% 41° 1% –
10 AM Sunny 48° 48° 0% – NE 1 86% 44° 1% –
11 AM Sunny 52° 52° 0% – E 1 80% 46° 1% –
12 PM Sunny 55° 55° 0% – E 1 72% 46° 1% –
1 PM Sunny 57° 57° 0% – SE 2 62% 44° 1% –
2 PM Sunny 59° 59° 0% – SE 2 55% 43° 3% –
3 PM Sunny 60° 60° 0% – SE 2 53% 43° 3% –
4 PM Sunny 60° 60° 0% – SE 2 53% 43° 3% –
5 PM Sunny 59° 59° 0% – SE 2 57% 44° 3% –
6 PM Clear 57° 57° 0% – SE 2 67% 46° 3% –
7 PM Clear 54° 54° 0% – SE 2 80% 48° 3% –
8 PM Clear 51° 51° 0% – SE 2 93% 49° 4% –
9 PM Clear 49° 49° 0% – SE 1 100% 49° 4% –
10 PM Clear 47° 47° 0% – SE 1 100% 47° 4% –
11 PM Clear 46° 46° 0% – Calm 100% 46° 4% –
Sunday, October 2524 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Clear 45° 45° 0% – Calm 100% 45° 4% –
1 AM Clear 45° 45° 0% – Calm 100% 45° 4% –
2 AM Mostly Clear 45° 45° 0% – Calm 96% 44° 7% –
3 AM Mostly Clear 44° 44° 0% – Calm 100% 44° 7% –
4 AM Mostly Clear 44° 44° 0% – Calm 96% 43° 7% –
5 AM Mostly Clear 43° 43° 0% – Calm 100% 43° 7% –
6 AM Sunny 42° 42° 0% – Calm 100% 42° 7% –
7 AM Sunny 41° 41° 0% – NW 1 100% 41° 7% –
8 AM Sunny 42° 42° 0% – NW 1 100% 42° 13% –
9 AM Sunny 45° 45° 0% – W 1 96% 44° 13% –
10 AM Sunny 50° 50° 0% – SW 1 93% 48° 13% –
11 AM Sunny 55° 55° 0% – S 1 83% 50° 13% –
12 PM Sunny 58° 58° 0% – S 1 75% 50° 13% –
1 PM Sunny 61° 61° 0% – S 2 65% 49° 13% –
2 PM Sunny 63° 63° 0% – S 2 58% 48° 8% –
3 PM Sunny 64° 64° 0% – S 2 56% 48° 8% –
4 PM Sunny 65° 65° 0% – S 2 54% 48° 8% –
5 PM Sunny 64° 64° 0% – S 2 58% 49° 8% –
6 PM Mostly Clear 61° 61° 0% – S 2 67% 50° 8% –
7 PM Mostly Clear 57° 57° 0% – S 2 80% 51° 8% –
8 PM Mostly Clear 54° 54° 0% – S 2 93% 52° 10% –
9 PM Mostly Clear 52° 52° 0% – S 2 100% 52° 10% –
10 PM Mostly Clear 51° 51° 0% – S 1 100% 51° 10% –
11 PM Mostly Clear 50° 50° 0% – S 1 100% 50° 10% –
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° 10% –
1 AM Mostly Clear 48° 48° 0% – SW 1 100% 48° 10% –
2 AM Mostly Clear 47° 47° 0% – SW 1 100% 47° 15% –
3 AM Mostly Clear 47° 47° 0% – SW 1 96% 46° 15% –
4 AM Mostly Clear 46° 46° 0% – W 1 96% 45° 15% –
5 AM Mostly Clear 46° 46° 0% – W 1 96% 45° 15% –
6 AM Sunny 45° 45° 0% – W 1 96% 44° 15% –
7 AM Sunny 44° 44° 0% – W 1 100% 44° 15% –
8 AM Sunny 45° 45° 0% – W 1 100% 45° 22% –
9 AM Sunny 48° 48° 0% – W 1 96% 47° 22% –
10 AM Sunny 52° 52° 0% – W 2 93% 50° 22% –
11 AM Sunny 57° 57° 0% – W 2 83% 52° 22% –
12 PM Sunny 61° 61° 0% – W 2 72% 52° 22% –
1 PM Sunny 64° 64° 0% – W 3 G8 65% 52° 22% –
2 PM Sunny 67° 67° 0% – W 3 G8 59% 52° 19% –
3 PM Sunny 69° 69° 0% – W 3 G8 55% 52° 19% –
4 PM Sunny 69° 69° 0% – W 3 55% 52° 19% –
5 PM Sunny 68° 68° 0% – W 3 59% 53° 19% –
6 PM Mostly Clear 66° 66° 0% – W 3 65% 54° 19% –
7 PM Mostly Clear 62° 62° 0% – W 2 78% 55° 19% –
8 PM Partly Cloudy 59° 59° 0% – W 2 90% 56° 30% –
9 PM Partly Cloudy 57° 57° 0% – W 2 96% 56° 30% –
10 PM Partly Cloudy 55° 55° 0% – W 2 100% 55° 30% –
11 PM Partly Cloudy 54° 54° 0% – W 2 100% 54° 30% –
Tuesday, October 279 hours
Time Conditions Temp Feels Precip Amount Wind Humidity Dew point Clouds UV
12 AM Partly Cloudy 53° 53° 0% – W 2 100% 53° 30% –
1 AM Partly Cloudy 53° 53° 0% – W 3 G8 100% 53° 30% –
2 AM Partly Cloudy 52° 52° 0% – W 3 G8 100% 52° 33% –
3 AM Partly Cloudy 51° 51° 0% – NW 3 G8 100% 51° 33% –
4 AM Partly Cloudy 51° 51° 0% – NW 5 100% 51° 33% –
5 AM Partly Cloudy 50° 48° 0% – NW 5 100% 50° 33% –
6 AM Mostly Sunny 49° 47° 0% – NW 5 G10 100% 49° 33% –
7 AM Mostly Sunny 49° 47° 0% – NW 6 100% 49° 33% –
8 AM Mostly Sunny 50° 48° 0% – NW 6 G12 100% 50° 38% –

National Weather Service forecast updated 2 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.