Point Forecast: Ashton-Sandy Spring MD  39.15N 77.01W (Elev. 449 ft)	Last Update: 4:53 pm EDT Apr 18, 2026

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Weather Elements Fire Weather Aviation 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 Trans. Wind  ktmphkm/hm/s Vent Rate (x1000 mph-ft) Atmospheric Dispersion Index Low Visibility Occurrence Risk Index Ceiling Height Visibility

48-Hour Period Starting: 6pm Sat, Apr 18 20267pm Sat, Apr 18 20268pm Sat, Apr 18 20269pm Sat, Apr 18 202610pm Sat, Apr 18 202611pm Sat, Apr 18 202612am Sun, Apr 19 20261am Sun, Apr 19 20262am Sun, Apr 19 20263am Sun, Apr 19 20264am Sun, Apr 19 20265am Sun, Apr 19 20266am Sun, Apr 19 20267am Sun, Apr 19 20268am Sun, Apr 19 20269am Sun, Apr 19 202610am Sun, Apr 19 202611am Sun, Apr 19 202612pm Sun, Apr 19 20261pm Sun, Apr 19 20262pm Sun, Apr 19 20263pm Sun, Apr 19 20264pm Sun, Apr 19 20265pm Sun, Apr 19 20266pm Sun, Apr 19 20267pm Sun, Apr 19 20268pm Sun, Apr 19 20269pm Sun, Apr 19 202610pm Sun, Apr 19 202611pm Sun, Apr 19 202612am Mon, Apr 20 20261am Mon, Apr 20 20262am Mon, Apr 20 20263am Mon, Apr 20 20264am Mon, Apr 20 20265am Mon, Apr 20 20266am Mon, Apr 20 20267am Mon, Apr 20 20268am Mon, Apr 20 20269am Mon, Apr 20 202610am Mon, Apr 20 202611am Mon, Apr 20 202612pm Mon, Apr 20 20261pm Mon, Apr 20 20262pm Mon, Apr 20 20263pm Mon, Apr 20 20264pm Mon, Apr 20 20265pm Mon, Apr 20 20266pm Mon, Apr 20 20267pm Mon, Apr 20 20268pm Mon, Apr 20 20269pm Mon, Apr 20 202610pm Mon, Apr 20 202611pm Mon, Apr 20 202612am Tue, Apr 21 20261am Tue, Apr 21 20262am Tue, Apr 21 20263am Tue, Apr 21 20264am Tue, Apr 21 20265am Tue, Apr 21 20266am Tue, Apr 21 20267am Tue, Apr 21 20268am Tue, Apr 21 20269am Tue, Apr 21 202610am Tue, Apr 21 202611am Tue, Apr 21 202612pm Tue, Apr 21 20261pm Tue, Apr 21 20262pm Tue, Apr 21 20263pm Tue, Apr 21 20264pm Tue, Apr 21 20265pm Tue, Apr 21 20266pm Tue, Apr 21 20267pm Tue, Apr 21 20268pm Tue, Apr 21 20269pm Tue, Apr 21 202610pm Tue, Apr 21 202611pm Tue, Apr 21 202612am Wed, Apr 22 20261am Wed, Apr 22 20262am Wed, Apr 22 20263am Wed, Apr 22 20264am Wed, Apr 22 20265am Wed, Apr 22 20266am Wed, Apr 22 20267am Wed, Apr 22 20268am Wed, Apr 22 20269am Wed, Apr 22 202610am Wed, Apr 22 202611am Wed, Apr 22 202612pm Wed, Apr 22 20261pm Wed, Apr 22 20262pm Wed, Apr 22 20263pm Wed, Apr 22 20264pm Wed, Apr 22 20265pm Wed, Apr 22 20266pm Wed, Apr 22 20267pm Wed, Apr 22 20268pm Wed, Apr 22 20269pm Wed, Apr 22 202610pm Wed, Apr 22 202611pm Wed, Apr 22 202612am Thu, Apr 23 20261am Thu, Apr 23 20262am Thu, Apr 23 20263am Thu, Apr 23 20264am Thu, Apr 23 20265am Thu, Apr 23 2026

Date	04/18						04/19
Hour (EDT)	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17
Temperature (°F)	79	76	73	70	67	66	65	64	63	62	58	58	54	49	50	49	49	49	50	51	56	55	57	57
Dewpoint (°F)	55	55	55	54	54	54	55	55	55	55	55	55	52	47	44	43	41	40	38	36	35	32	29	28
Wind Chill (°F)														43	44	43	43	44	45
Surface Wind (mph)	13	13	11	10	9	7	6	5	3	6	8	10	13	16	18	18	16	14	14	14	13	14	14	14
Wind Dir	SE	SE	SE	SE	SE	SE	SE	E	E	E	N	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW
Gust	23	21	21	20								18	23	26	29	29	28	25	25	24	23	24	24	24
Sky Cover (%)	68	65	62	65	81	74	87	76	88	86	83	93	87	93	94	93	91	88	85	85	71	61	50	40
Precipitation Potential (%)	4	4	6	7	10	13	15	18	22	26	31	49	46	72	80	68	65	43	21	2	0	0	0	0
Relative Humidity (%)	44	48	53	57	63	65	70	73	75	78	90	90	93	93	80	80	74	71	63	56	45	41	34	33
Rain	--	--	--	--	--	--	SChc	SChc	SChc	Chc	Chc	Chc	Chc	Lkly	Ocnl	Lkly	Lkly	Chc	SChc	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Snow	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Freezing Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Sleet	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date							04/20
Hour (EDT)	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17
Temperature (°F)	56	54	52	49	47	46	45	43	42	41	41	41	41	42	43	45	47	49	50	51	51	52	52	52
Dewpoint (°F)	27	26	26	26	26	26	27	28	29	30	30	30	30	30	30	29	28	27	26	24	23	22	20	19
Wind Chill (°F)				47	45	44	43	40	39	38	37	37	36	37	38	40	42	44	45
Surface Wind (mph)	11	10	8	6	5	5	5	5	5	5	6	6	7	8	9	10	10	11	13	13	14	14	14	13
Wind Dir	NW	NW	NW	NW	NW	W	W	W	W	W	W	W	W	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW
Gust	22	18														18	20	20	21	23	23	24	24	23
Sky Cover (%)	40	40	13	11	10	8	15	23	30	31	32	33	31	30	28	28	29	29	33	38	42	39	36	33
Precipitation Potential (%)	0	0	6	6	6	6	6	6	7	7	7	7	7	7	16	16	16	16	16	16	11	11	11	11
Relative Humidity (%)	32	34	36	40	43	45	49	55	60	65	65	65	65	62	60	53	47	42	39	34	33	31	28	27
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc	SChc	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Snow	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Freezing Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Sleet	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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