Point Forecast: 4 Miles WNW Castleton IL  41.14N 89.77W (Elev. 676 ft)	Last Update: 4:36 pm CDT Jul 18, 2026

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Weather Elements Fire Weather Probabilistic Forecasts (Experimental) Description | Survey 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) Quantitative Precipitation  3-hr6-hr12-hr24-hr   info     0.100.250.501.00 Snowfall  3-hr6-hr12-hr24-hr   info     0.1in1in3in6in12in

48-Hour Period Starting: 4pm Sat, Jul 18 20265pm Sat, Jul 18 20266pm Sat, Jul 18 20267pm Sat, Jul 18 20268pm Sat, Jul 18 20269pm Sat, Jul 18 202610pm Sat, Jul 18 202611pm Sat, Jul 18 202612am Sun, Jul 19 20261am Sun, Jul 19 20262am Sun, Jul 19 20263am Sun, Jul 19 20264am Sun, Jul 19 20265am Sun, Jul 19 20266am Sun, Jul 19 20267am Sun, Jul 19 20268am Sun, Jul 19 20269am Sun, Jul 19 202610am Sun, Jul 19 202611am Sun, Jul 19 202612pm Sun, Jul 19 20261pm Sun, Jul 19 20262pm Sun, Jul 19 20263pm Sun, Jul 19 20264pm Sun, Jul 19 20265pm Sun, Jul 19 20266pm Sun, Jul 19 20267pm Sun, Jul 19 20268pm Sun, Jul 19 20269pm Sun, Jul 19 202610pm Sun, Jul 19 202611pm Sun, Jul 19 202612am Mon, Jul 20 20261am Mon, Jul 20 20262am Mon, Jul 20 20263am Mon, Jul 20 20264am Mon, Jul 20 20265am Mon, Jul 20 20266am Mon, Jul 20 20267am Mon, Jul 20 20268am Mon, Jul 20 20269am Mon, Jul 20 202610am Mon, Jul 20 202611am Mon, Jul 20 202612pm Mon, Jul 20 20261pm Mon, Jul 20 20262pm Mon, Jul 20 20263pm Mon, Jul 20 20264pm Mon, Jul 20 20265pm Mon, Jul 20 20266pm Mon, Jul 20 20267pm Mon, Jul 20 20268pm Mon, Jul 20 20269pm Mon, Jul 20 202610pm Mon, Jul 20 202611pm Mon, Jul 20 202612am Tue, Jul 21 20261am Tue, Jul 21 20262am Tue, Jul 21 20263am Tue, Jul 21 20264am Tue, Jul 21 20265am Tue, Jul 21 20266am Tue, Jul 21 20267am Tue, Jul 21 20268am Tue, Jul 21 20269am Tue, Jul 21 202610am Tue, Jul 21 202611am Tue, Jul 21 202612pm Tue, Jul 21 20261pm Tue, Jul 21 20262pm Tue, Jul 21 20263pm Tue, Jul 21 20264pm Tue, Jul 21 20265pm Tue, Jul 21 20266pm Tue, Jul 21 20267pm Tue, Jul 21 20268pm Tue, Jul 21 20269pm Tue, Jul 21 202610pm Tue, Jul 21 202611pm Tue, Jul 21 202612am Wed, Jul 22 20261am Wed, Jul 22 20262am Wed, Jul 22 20263am Wed, Jul 22 20264am Wed, Jul 22 20265am Wed, Jul 22 20266am Wed, Jul 22 20267am Wed, Jul 22 20268am Wed, Jul 22 20269am Wed, Jul 22 202610am Wed, Jul 22 202611am Wed, Jul 22 202612pm Wed, Jul 22 20261pm Wed, Jul 22 20262pm Wed, Jul 22 20263pm Wed, Jul 22 20264pm Wed, Jul 22 20265pm Wed, Jul 22 20266pm Wed, Jul 22 20267pm Wed, Jul 22 20268pm Wed, Jul 22 20269pm Wed, Jul 22 202610pm Wed, Jul 22 202611pm Wed, Jul 22 202612am Thu, Jul 23 20261am Thu, Jul 23 20262am Thu, Jul 23 20263am Thu, Jul 23 2026

Date	07/18								07/19
Hour (CDT)	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15
Temperature (°F)	75	77	76	75	76	77	75	74	73	71	70	68	67	67	66	68	70	72	76	79	81	83	83	83
Dewpoint (°F)	75	75	74	73	71	69	68	67	66	66	65	64	64	63	62	63	64	65	65	66	66	65	66	65
Heat Index (°F)	75	77	76	75	76	77	75												76	79	83	85	85	85
Surface Wind (mph)	10	9	8	7	5	5	5	3	5	5	5	6	6	5	5	5	5	6	6	5	5	5	5	5
Wind Dir	WNW	NW	NNW	NNW	NNW	N	N	NE	ENE	ENE	E	E	ENE	ENE	ENE	ENE	E	E	E	E	E	E	E	E
Gust	17	16	15
Sky Cover (%)	43	44	34	24	27	8	6	13	19	36	18	25	29	29	25	28	27	30	25	26	25	25	25	25
Precipitation Potential (%)	45	32	22	6	2	1	1	1	0	1	1	0	0	0	1	0	0	0	0	0	0	0	0	0
Relative Humidity (%)	100	94	94	94	87	76	79	79	79	84	84	87	90	87	87	84	81	79	69	64	60	55	57	55
Rain	Chc	Chc	SChc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	Chc	Chc	SChc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date									07/20
Hour (CDT)	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15
Temperature (°F)	84	83	83	82	78	74	72	71	70	69	68	66	66	65	64	66	70	75	79	82	84	86	87	88
Dewpoint (°F)	65	65	64	64	65	64	63	63	63	62	62	61	61	61	61	63	65	67	68	69	70	70	70	71
Heat Index (°F)	86	85	84	83	78													75	79	85	88	91	92	94
Surface Wind (mph)	5	5	5	3	3	3	3	2	2	3	2	2	2	2	3	3	5	6	7	7	8	8	9	9
Wind Dir	E	E	E	E	ENE	E	ESE	ESE	SE	SE	SE	SE	SE	SSE	SSE	SSE	S	S	S	S	SSW	SSW	SSW	SSW
Gust																						15	16	16
Sky Cover (%)	25	25	25	25	26	32	30	30	34	17	18	25	22	21	40	28	46	42	38	40	42	44	38	33
Precipitation Potential (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	1	2	2	2	2	2	2	2	21	21	21
Relative Humidity (%)	53	55	53	55	64	71	73	76	78	78	81	84	84	87	90	90	84	76	69	65	63	59	57	57
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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