weather.gov

Home

News

Organization

Search for:  NWSAll NOAA

Point Forecast: Fairfax VA  38.85N 77.29W (Elev. 400 ft)	Last Update: 10:27 am EST Jan 18, 2020

[hide menu]  |  Font Size: A A A

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

48-Hour Period Starting: 11am Sat, Jan 18 202012pm Sat, Jan 18 20201pm Sat, Jan 18 20202pm Sat, Jan 18 20203pm Sat, Jan 18 20204pm Sat, Jan 18 20205pm Sat, Jan 18 20206pm Sat, Jan 18 20207pm Sat, Jan 18 20208pm Sat, Jan 18 20209pm Sat, Jan 18 202010pm Sat, Jan 18 202011pm Sat, Jan 18 202012am Sun, Jan 19 20201am Sun, Jan 19 20202am Sun, Jan 19 20203am Sun, Jan 19 20204am Sun, Jan 19 20205am Sun, Jan 19 20206am Sun, Jan 19 20207am Sun, Jan 19 20208am Sun, Jan 19 20209am Sun, Jan 19 202010am Sun, Jan 19 202011am Sun, Jan 19 202012pm Sun, Jan 19 20201pm Sun, Jan 19 20202pm Sun, Jan 19 20203pm Sun, Jan 19 20204pm Sun, Jan 19 20205pm Sun, Jan 19 20206pm Sun, Jan 19 20207pm Sun, Jan 19 20208pm Sun, Jan 19 20209pm Sun, Jan 19 202010pm Sun, Jan 19 202011pm Sun, Jan 19 202012am Mon, Jan 20 20201am Mon, Jan 20 20202am Mon, Jan 20 20203am Mon, Jan 20 20204am Mon, Jan 20 20205am Mon, Jan 20 20206am Mon, Jan 20 20207am Mon, Jan 20 20208am Mon, Jan 20 20209am Mon, Jan 20 202010am Mon, Jan 20 202011am Mon, Jan 20 202012pm Mon, Jan 20 20201pm Mon, Jan 20 20202pm Mon, Jan 20 20203pm Mon, Jan 20 20204pm Mon, Jan 20 20205pm Mon, Jan 20 20206pm Mon, Jan 20 20207pm Mon, Jan 20 20208pm Mon, Jan 20 20209pm Mon, Jan 20 202010pm Mon, Jan 20 202011pm Mon, Jan 20 202012am Tue, Jan 21 20201am Tue, Jan 21 20202am Tue, Jan 21 20203am Tue, Jan 21 20204am Tue, Jan 21 20205am Tue, Jan 21 20206am Tue, Jan 21 20207am Tue, Jan 21 20208am Tue, Jan 21 20209am Tue, Jan 21 202010am Tue, Jan 21 202011am Tue, Jan 21 202012pm Tue, Jan 21 20201pm Tue, Jan 21 20202pm Tue, Jan 21 20203pm Tue, Jan 21 20204pm Tue, Jan 21 20205pm Tue, Jan 21 20206pm Tue, Jan 21 20207pm Tue, Jan 21 20208pm Tue, Jan 21 20209pm Tue, Jan 21 202010pm Tue, Jan 21 202011pm Tue, Jan 21 202012am Wed, Jan 22 20201am Wed, Jan 22 20202am Wed, Jan 22 20203am Wed, Jan 22 20204am Wed, Jan 22 20205am Wed, Jan 22 20206am Wed, Jan 22 20207am Wed, Jan 22 20208am Wed, Jan 22 20209am Wed, Jan 22 202010am Wed, Jan 22 202011am Wed, Jan 22 202012pm Wed, Jan 22 20201pm Wed, Jan 22 20202pm Wed, Jan 22 20203pm Wed, Jan 22 20204pm Wed, Jan 22 20205pm Wed, Jan 22 20206pm Wed, Jan 22 20207pm Wed, Jan 22 20208pm Wed, Jan 22 20209pm Wed, Jan 22 202010pm Wed, Jan 22 2020

Date	01/18													01/19
Hour (EST)	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10
Temperature (°F)	29	30	31	32	32	32	33	34	35	36	37	38	39	39	39	39	38	37	36	35	38	34	35	38
Dewpoint (°F)	23	23	24	25	26	27	29	32	34	35	36	37	38	38	38	38	37	35	33	30	28	26	25	24
Wind Chill (°F)	19	20	22	23	23	23	24	25	26	27	28	29	31	31	31	32	31	30	29	27	31	25	25	29
Surface Wind (mph)	10	10	11	11	13	13	13	13	14	15	15	15	15	14	13	11	10	10	10	10	11	13	15	16
Wind Dir	S	S	S	S	S	S	S	S	S	SW	SW	SW	SW	SW	SW	SW	SW	W	W	W	W	NW	NW	NW
Gust			18	20	21	21	21	22	22	23	23	23	23	22	21	18					18	21	23	25
Sky Cover (%)	89	92	95	97	98	98	96	93	89	84	80	76	73	71	71	72	72	68	59	48	40	37	37	38
Precipitation Potential (%)	59	59	88	88	88	97	97	97	37	37	37	15	15	15	32	32	32	17	17	17	1	1	1	1
Relative Humidity (%)	78	75	75	75	78	81	85	92	96	96	96	96	96	96	96	96	96	92	89	82	67	72	66	57
Rain	--	--	--	--	--	Ocnl	Ocnl	Ocnl	Chc	Chc	Chc	SChc	SChc	SChc	Chc	Chc	Chc	SChc	SChc	SChc	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Snow	Lkly	Lkly	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	--	--	--	--
Freezing Rain	--	--	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Sleet	Lkly	Lkly	Ocnl	Ocnl	Ocnl	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date														01/20
Hour (EST)	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10
Temperature (°F)	41	41	41	40	39	38	36	34	32	30	28	27	26	25	24	23	23	22	22	22	22	23	25	27
Dewpoint (°F)	23	21	20	18	17	16	15	15	15	15	14	14	14	14	14	14	14	14	14	14	14	14	15	15
Wind Chill (°F)	33	33	33	32	30	29	26	24	22	19	16	15	14	14	14	12	12	10	10	11	11	12	14	16
Surface Wind (mph)	16	16	16	16	17	17	16	15	14	14	15	15	14	11	10	10	11	13	11	10	10	11	13	14
Wind Dir	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW
Gust	25	25	25	25	28	28	25	24	23	23	23	23	22	18			20	21	18			18	21	22
Sky Cover (%)	37	36	35	36	37	35	30	23	16	12	11	11	12	14	16	19	22	24	25	24	24	24	25	24
Precipitation Potential (%)	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
Relative Humidity (%)	48	44	42	41	40	40	42	45	49	53	55	57	60	62	65	68	68	71	71	71	71	68	65	60
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Snow	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Freezing Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Sleet	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

International System of 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