weather.gov

Home

News

Organization

Search for:  NWSAll NOAA

Point Forecast: Washington-Dulles International Airport VA  38.95N 77.44W (Elev. 87 m)	Last Update: 7:31 am EDT Jul 31, 2021

[hide menu]

Weather Elements Weather/Precipitation Fire Weather Temperature (°C) Dewpoint (°C) Heat Index (°C) Surface Wind  ktmphkm/hm/s Sky Cover (%) Precipitation Potential (%) Relative Humidity (%) Rain Thunder Fog Mixing Height  x100ftx100m Haines Index Lightning Activity Level Trans. Wind  ktmphkm/hm/s Vent Rate (x1000 mph-m) Atmospheric Dispersion Index Low Visibility Occurrence Risk Index

48-Hour Period Starting: 10am Sat, Jul 31 202111am Sat, Jul 31 202112pm Sat, Jul 31 20211pm Sat, Jul 31 20212pm Sat, Jul 31 20213pm Sat, Jul 31 20214pm Sat, Jul 31 20215pm Sat, Jul 31 20216pm Sat, Jul 31 20217pm Sat, Jul 31 20218pm Sat, Jul 31 20219pm Sat, Jul 31 202110pm Sat, Jul 31 202111pm Sat, Jul 31 202112am Sun, Aug 1 20211am Sun, Aug 1 20212am Sun, Aug 1 20213am Sun, Aug 1 20214am Sun, Aug 1 20215am Sun, Aug 1 20216am Sun, Aug 1 20217am Sun, Aug 1 20218am Sun, Aug 1 20219am Sun, Aug 1 202110am Sun, Aug 1 202111am Sun, Aug 1 202112pm Sun, Aug 1 20211pm Sun, Aug 1 20212pm Sun, Aug 1 20213pm Sun, Aug 1 20214pm Sun, Aug 1 20215pm Sun, Aug 1 20216pm Sun, Aug 1 20217pm Sun, Aug 1 20218pm Sun, Aug 1 20219pm Sun, Aug 1 202110pm Sun, Aug 1 202111pm Sun, Aug 1 202112am Mon, Aug 2 20211am Mon, Aug 2 20212am Mon, Aug 2 20213am Mon, Aug 2 20214am Mon, Aug 2 20215am Mon, Aug 2 20216am Mon, Aug 2 20217am Mon, Aug 2 20218am Mon, Aug 2 20219am Mon, Aug 2 202110am Mon, Aug 2 202111am Mon, Aug 2 202112pm Mon, Aug 2 20211pm Mon, Aug 2 20212pm Mon, Aug 2 20213pm Mon, Aug 2 20214pm Mon, Aug 2 20215pm Mon, Aug 2 20216pm Mon, Aug 2 20217pm Mon, Aug 2 20218pm Mon, Aug 2 20219pm Mon, Aug 2 202110pm Mon, Aug 2 202111pm Mon, Aug 2 202112am Tue, Aug 3 20211am Tue, Aug 3 20212am Tue, Aug 3 20213am Tue, Aug 3 20214am Tue, Aug 3 20215am Tue, Aug 3 20216am Tue, Aug 3 20217am Tue, Aug 3 20218am Tue, Aug 3 20219am Tue, Aug 3 202110am Tue, Aug 3 202111am Tue, Aug 3 202112pm Tue, Aug 3 20211pm Tue, Aug 3 20212pm Tue, Aug 3 20213pm Tue, Aug 3 20214pm Tue, Aug 3 20215pm Tue, Aug 3 20216pm Tue, Aug 3 20217pm Tue, Aug 3 20218pm Tue, Aug 3 20219pm Tue, Aug 3 202110pm Tue, Aug 3 202111pm Tue, Aug 3 202112am Wed, Aug 4 20211am Wed, Aug 4 20212am Wed, Aug 4 20213am Wed, Aug 4 20214am Wed, Aug 4 20215am Wed, Aug 4 20216am Wed, Aug 4 20217am Wed, Aug 4 20218am Wed, Aug 4 20219am Wed, Aug 4 202110am Wed, Aug 4 202111am Wed, Aug 4 202112pm Wed, Aug 4 20211pm Wed, Aug 4 20212pm Wed, Aug 4 20213pm Wed, Aug 4 20214pm Wed, Aug 4 20215pm Wed, Aug 4 20216pm Wed, Aug 4 20217pm Wed, Aug 4 20218pm Wed, Aug 4 20219pm Wed, Aug 4 2021

Date	07/31														08/01
Hour (EDT)	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09
Temperature (°C)	21	22	24	26	26	27	28	28	27	26	24	23	22	21	20	19	19	18	18	18	19	19	20	21
Dewpoint (°C)	12	12	12	12	12	13	13	13	13	13	14	14	15	16	16	16	16	17	17	17	18	18	18	19
Heat Index (°C)			24	26	26	27	27	27	27	26	24
Surface Wind (mph)	3	3	3	3	3	3	5	5	5	5	5	3	3	3	5	3	3	2	2	3	3	3	5	6
Wind Dir	NE	N	N	W	W	W	W	W	SW	S	S	SE	SE	SE	SE	S	S	S	S	S	S	S	S	S
Gust
Sky Cover (%)	72	58	34	37	32	41	54	70	67	68	64	67	58	51	64	65	61	63	73	77	74	74	78	81
Precipitation Potential (%)	1	0	0	1	1	1	2	1	3	5	6	6	6	6	5	15	24	29	35	49	63	62	62	62
Relative Humidity (%)	59	53	48	43	42	41	40	40	42	47	52	57	64	71	78	81	84	90	93	93	93	90	90	90
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	Chc	Chc	Chc	Lkly	Lkly	Lkly	Lkly
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Fog	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date															08/02
Hour (EDT)	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09
Temperature (°C)	22	22	23	24	25	26	27	27	26	26	24	23	22	21	21	20	19	18	17	17	17	17	18	20
Dewpoint (°C)	19	19	19	19	19	19	19	19	19	19	19	19	18	18	18	17	17	16	16	16	16	16	16	15
Heat Index (°C)				24	25	26	28	28	26	26	24
Surface Wind (mph)	7	7	7	6	6	7	8	9	8	8	7	6	6	6	6	7	8	7	7	7	7	8	9	9
Wind Dir	S	S	S	S	S	S	S	S	S	S	S	SW	W	W	W	NW	NW	NW	NW	NW	NW	NW	NW	NW
Gust
Sky Cover (%)	84	86	79	72	64	59	54	49	43	38	33	28	24	20	14	8	2	3	3	4	3	3	2	5
Precipitation Potential (%)	62	69	69	69	45	45	45	42	42	42	12	12	12	11	11	11	2	2	2	1	1	1	0	0
Relative Humidity (%)	84	84	81	74	69	67	62	62	64	67	71	76	79	84	84	84	84	87	93	93	93	90	84	73
Rain	Lkly	Lkly	Lkly	Lkly	Chc	Chc	Chc	Chc	Chc	Chc	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	SChc	SChc	SChc	Chc	Chc	Chc	Chc	Chc	Chc	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Fog	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

English Units Forecast Discussion 7-Day Forecast Hourly Weather Graph Hazardous Weather Briefing Page Past Weather Information Interactive Forecast Map Home

---

Webmaster NOAA's National Weather Service Baltimore, MD/Washington, D.C.

Disclaimer Credits Glossary

Privacy Policy About Us Career Opportunities