weather.gov

Home

News

Organization

Search for:  NWSAll NOAA

Point Forecast: Rockville MD  39.08N 77.16W (Elev. 430 ft)	Last Update: 1:30 am EDT May 18, 2021

[hide menu]  |  Font Size: A A A

Weather Elements Weather/Precipitation Fire Weather Temperature (°F) Dewpoint (°F) Heat Index (°F) 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-ft) Atmospheric Dispersion Index Low Visibility Occurrence Risk Index

48-Hour Period Starting: 2am Tue, May 18 20213am Tue, May 18 20214am Tue, May 18 20215am Tue, May 18 20216am Tue, May 18 20217am Tue, May 18 20218am Tue, May 18 20219am Tue, May 18 202110am Tue, May 18 202111am Tue, May 18 202112pm Tue, May 18 20211pm Tue, May 18 20212pm Tue, May 18 20213pm Tue, May 18 20214pm Tue, May 18 20215pm Tue, May 18 20216pm Tue, May 18 20217pm Tue, May 18 20218pm Tue, May 18 20219pm Tue, May 18 202110pm Tue, May 18 202111pm Tue, May 18 202112am Wed, May 19 20211am Wed, May 19 20212am Wed, May 19 20213am Wed, May 19 20214am Wed, May 19 20215am Wed, May 19 20216am Wed, May 19 20217am Wed, May 19 20218am Wed, May 19 20219am Wed, May 19 202110am Wed, May 19 202111am Wed, May 19 202112pm Wed, May 19 20211pm Wed, May 19 20212pm Wed, May 19 20213pm Wed, May 19 20214pm Wed, May 19 20215pm Wed, May 19 20216pm Wed, May 19 20217pm Wed, May 19 20218pm Wed, May 19 20219pm Wed, May 19 202110pm Wed, May 19 202111pm Wed, May 19 202112am Thu, May 20 20211am Thu, May 20 20212am Thu, May 20 20213am Thu, May 20 20214am Thu, May 20 20215am Thu, May 20 20216am Thu, May 20 20217am Thu, May 20 20218am Thu, May 20 20219am Thu, May 20 202110am Thu, May 20 202111am Thu, May 20 202112pm Thu, May 20 20211pm Thu, May 20 20212pm Thu, May 20 20213pm Thu, May 20 20214pm Thu, May 20 20215pm Thu, May 20 20216pm Thu, May 20 20217pm Thu, May 20 20218pm Thu, May 20 20219pm Thu, May 20 202110pm Thu, May 20 202111pm Thu, May 20 202112am Fri, May 21 20211am Fri, May 21 20212am Fri, May 21 20213am Fri, May 21 20214am Fri, May 21 20215am Fri, May 21 20216am Fri, May 21 20217am Fri, May 21 20218am Fri, May 21 20219am Fri, May 21 202110am Fri, May 21 202111am Fri, May 21 202112pm Fri, May 21 20211pm Fri, May 21 20212pm Fri, May 21 20213pm Fri, May 21 20214pm Fri, May 21 20215pm Fri, May 21 20216pm Fri, May 21 20217pm Fri, May 21 20218pm Fri, May 21 20219pm Fri, May 21 202110pm Fri, May 21 202111pm Fri, May 21 202112am Sat, May 22 20211am Sat, May 22 20212am Sat, May 22 20213am Sat, May 22 20214am Sat, May 22 20215am Sat, May 22 20216am Sat, May 22 20217am Sat, May 22 20218am Sat, May 22 20219am Sat, May 22 202110am Sat, May 22 202111am Sat, May 22 202112pm Sat, May 22 20211pm Sat, May 22 2021

Date	05/18																						05/19
Hour (EDT)	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01
Temperature (°F)	54	53	52	52	52	54	57	62	67	71	75	76	78	78	79	79	78	76	73	68	66	64	62	61
Dewpoint (°F)	48	48	48	48	47	48	49	48	48	48	49	48	47	47	47	47	47	48	49	50	49	49	49	49
Heat Index (°F)												75	76	78	78	78	77	76
Surface Wind (mph)	2	2	2	2	2	2	2	5	5	5	5	5	3	3	5	6	5	5	3	2	3	3	3	3
Wind Dir	S	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	W	SW	SW	S	S	S	S	S	SW
Gust
Sky Cover (%)	38	36	33	30	31	31	24	25	26	26	28	32	34	33	32	31	27	19	15	13	9	7	9	12
Precipitation Potential (%)	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2
Relative Humidity (%)	72	74	77	80	74	74	67	54	47	42	41	38	36	33	33	33	35	37	44	51	54	58	62	65
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date																							05/20
Hour (EDT)	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01
Temperature (°F)	61	59	58	58	59	61	64	68	73	77	80	81	82	83	83	83	82	80	78	75	72	69	67	65
Dewpoint (°F)	49	49	50	51	51	51	53	54	55	55	53	51	50	49	49	50	51	52	53	54	54	54	54	54
Heat Index (°F)										78	80	81	81	82	82	81	81	80	78	75
Surface Wind (mph)	3	2	2	2	2	2	2	3	3	2	2	2	2	3	5	6	6	5	3	2	2	2	2	2
Wind Dir	SW	SW	W	W	W	W	W	NW	NW	NW	W	W	W	W	W	W	W	W	W	SW	S	S	S	SW
Gust
Sky Cover (%)	14	12	8	6	8	13	15	14	11	9	12	17	20	19	17	16	16	17	17	15	10	8	12	19
Precipitation Potential (%)	2	2	2	2	2	2	2	2	2	2	2	2	3	3	3	3	3	3	1	1	1	1	1	1
Relative Humidity (%)	67	69	75	80	77	75	67	59	53	45	39	34	32	30	30	32	34	38	42	48	53	59	63	65
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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