Point Forecast: Chambersburg PA  39.93N 77.66W (Elev. 617 ft)	Last Update: 4:01 am EDT Aug 23, 2026

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Weather Elements Fire Weather Aviation 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 Trans. Wind  ktmphkm/hm/s 20ft Wind  ktmphkm/hm/s Vent Rate (x1000 mph-ft) Davis Stability Index Atmospheric Dispersion Index Low Visibility Occurrence Risk Index Ceiling Height Visibility Thunder Potential

48-Hour Period Starting: 5am Sun, Aug 23 20266am Sun, Aug 23 20267am Sun, Aug 23 20268am Sun, Aug 23 20269am Sun, Aug 23 202610am Sun, Aug 23 202611am Sun, Aug 23 202612pm Sun, Aug 23 20261pm Sun, Aug 23 20262pm Sun, Aug 23 20263pm Sun, Aug 23 20264pm Sun, Aug 23 20265pm Sun, Aug 23 20266pm Sun, Aug 23 20267pm Sun, Aug 23 20268pm Sun, Aug 23 20269pm Sun, Aug 23 202610pm Sun, Aug 23 202611pm Sun, Aug 23 202612am Mon, Aug 24 20261am Mon, Aug 24 20262am Mon, Aug 24 20263am Mon, Aug 24 20264am Mon, Aug 24 20265am Mon, Aug 24 20266am Mon, Aug 24 20267am Mon, Aug 24 20268am Mon, Aug 24 20269am Mon, Aug 24 202610am Mon, Aug 24 202611am Mon, Aug 24 202612pm Mon, Aug 24 20261pm Mon, Aug 24 20262pm Mon, Aug 24 20263pm Mon, Aug 24 20264pm Mon, Aug 24 20265pm Mon, Aug 24 20266pm Mon, Aug 24 20267pm Mon, Aug 24 20268pm Mon, Aug 24 20269pm Mon, Aug 24 202610pm Mon, Aug 24 202611pm Mon, Aug 24 202612am Tue, Aug 25 20261am Tue, Aug 25 20262am Tue, Aug 25 20263am Tue, Aug 25 20264am Tue, Aug 25 20265am Tue, Aug 25 20266am Tue, Aug 25 20267am Tue, Aug 25 20268am Tue, Aug 25 20269am Tue, Aug 25 202610am Tue, Aug 25 202611am Tue, Aug 25 202612pm Tue, Aug 25 20261pm Tue, Aug 25 20262pm Tue, Aug 25 20263pm Tue, Aug 25 20264pm Tue, Aug 25 20265pm Tue, Aug 25 20266pm Tue, Aug 25 20267pm Tue, Aug 25 20268pm Tue, Aug 25 20269pm Tue, Aug 25 202610pm Tue, Aug 25 202611pm Tue, Aug 25 202612am Wed, Aug 26 20261am Wed, Aug 26 20262am Wed, Aug 26 20263am Wed, Aug 26 20264am Wed, Aug 26 20265am Wed, Aug 26 20266am Wed, Aug 26 20267am Wed, Aug 26 20268am Wed, Aug 26 20269am Wed, Aug 26 202610am Wed, Aug 26 202611am Wed, Aug 26 202612pm Wed, Aug 26 20261pm Wed, Aug 26 20262pm Wed, Aug 26 20263pm Wed, Aug 26 20264pm Wed, Aug 26 20265pm Wed, Aug 26 20266pm Wed, Aug 26 20267pm Wed, Aug 26 20268pm Wed, Aug 26 20269pm Wed, Aug 26 202610pm Wed, Aug 26 202611pm Wed, Aug 26 202612am Thu, Aug 27 20261am Thu, Aug 27 20262am Thu, Aug 27 20263am Thu, Aug 27 20264am Thu, Aug 27 20265am Thu, Aug 27 20266am Thu, Aug 27 20267am Thu, Aug 27 20268am Thu, Aug 27 20269am Thu, Aug 27 202610am Thu, Aug 27 202611am Thu, Aug 27 202612pm Thu, Aug 27 20261pm Thu, Aug 27 20262pm Thu, Aug 27 20263pm Thu, Aug 27 20264pm Thu, Aug 27 2026

Date	08/23																			08/24
Hour (EDT)	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04
Temperature (°F)	65	64	64	66	68	72	75	77	79	80	77	76	75	73	71	70	67	65	63	62	61	60	60	59
Dewpoint (°F)	65	64	64	66	66	66	65	65	64	63	63	62	61	61	60	60	61	61	61	60	59	58	59	58
Heat Index (°F)							75	77	79	81	77	76	75
Surface Wind (mph)	3	5	5	5	6	7	8	9	9	9	10	10	9	8	6	5	3	2	2	2	2	2	2	2
Wind Dir	SW	SW	SW	SW	W	W	W	W	W	W	W	W	W	W	W	W	W	W	SW	SW	SW	S	S	S
Gust
Sky Cover (%)	50	44	27	24	16	16	32	17	25	25	29	29	21	28	18	16	6	11	6	4	14	13	17	30
Precipitation Potential (%)	1	1	0	0	0	0	0	0	1	1	0	0	0	0	0	0	0	0	0	3	5	4	4	2
Relative Humidity (%)	100	100	100	100	93	81	71	67	60	56	62	62	62	66	68	71	81	87	93	93	93	93	96	96
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date																				08/25
Hour (EDT)	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04
Temperature (°F)	59	58	57	60	64	68	72	74	75	77	75	76	73	72	71	68	65	63	62	61	59	58	57	57
Dewpoint (°F)	58	57	57	59	60	60	60	60	60	59	59	59	58	58	58	56	57	57	57	56	56	55	55	55
Heat Index (°F)									75	77	75	76
Surface Wind (mph)	3	3	3	3	5	6	8	8	9	9	9	9	9	8	6	3	2	2	2	2	2	2	2	2
Wind Dir	S	S	S	SW	SW	W	W	W	W	W	W	W	W	W	W	W	W	W	W	W	W	SW	SW	SW
Gust
Sky Cover (%)	24	27	12	4	2	1	17	22	23	27	39	38	32	28	17	7	1	3	4	5	6	7	7	7
Precipitation Potential (%)	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Relative Humidity (%)	96	96	100	96	87	76	66	62	60	54	58	56	59	61	64	65	75	81	84	84	90	90	93	93
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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