Point Forecast: Markham IL  41.6N 87.7W	Last Update: 9:41 am CDT Jul 22, 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: 12pm 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 20264am Thu, Jul 23 20265am Thu, Jul 23 20266am Thu, Jul 23 20267am Thu, Jul 23 20268am Thu, Jul 23 20269am Thu, Jul 23 202610am Thu, Jul 23 202611am Thu, Jul 23 202612pm Thu, Jul 23 20261pm Thu, Jul 23 20262pm Thu, Jul 23 20263pm Thu, Jul 23 20264pm Thu, Jul 23 20265pm Thu, Jul 23 20266pm Thu, Jul 23 20267pm Thu, Jul 23 20268pm Thu, Jul 23 20269pm Thu, Jul 23 202610pm Thu, Jul 23 202611pm Thu, Jul 23 202612am Fri, Jul 24 20261am Fri, Jul 24 20262am Fri, Jul 24 20263am Fri, Jul 24 20264am Fri, Jul 24 20265am Fri, Jul 24 20266am Fri, Jul 24 20267am Fri, Jul 24 20268am Fri, Jul 24 20269am Fri, Jul 24 202610am Fri, Jul 24 202611am Fri, Jul 24 202612pm Fri, Jul 24 20261pm Fri, Jul 24 20262pm Fri, Jul 24 20263pm Fri, Jul 24 20264pm Fri, Jul 24 20265pm Fri, Jul 24 20266pm Fri, Jul 24 20267pm Fri, Jul 24 20268pm Fri, Jul 24 20269pm Fri, Jul 24 202610pm Fri, Jul 24 202611pm Fri, Jul 24 202612am Sat, Jul 25 20261am Sat, Jul 25 20262am Sat, Jul 25 20263am Sat, Jul 25 20264am Sat, Jul 25 20265am Sat, Jul 25 20266am Sat, Jul 25 20267am Sat, Jul 25 20268am Sat, Jul 25 20269am Sat, Jul 25 202610am Sat, Jul 25 202611am Sat, Jul 25 202612pm Sat, Jul 25 20261pm Sat, Jul 25 20262pm Sat, Jul 25 20263pm Sat, Jul 25 20264pm Sat, Jul 25 20265pm Sat, Jul 25 20266pm Sat, Jul 25 20267pm Sat, Jul 25 20268pm Sat, Jul 25 20269pm Sat, Jul 25 202610pm Sat, Jul 25 202611pm Sat, Jul 25 202612am Sun, Jul 26 20261am Sun, Jul 26 20262am Sun, Jul 26 20263am Sun, Jul 26 20264am Sun, Jul 26 20265am Sun, Jul 26 20266am Sun, Jul 26 20267am Sun, Jul 26 20268am Sun, Jul 26 20269am Sun, Jul 26 202610am Sun, Jul 26 202611am Sun, Jul 26 202612pm Sun, Jul 26 20261pm Sun, Jul 26 20262pm Sun, Jul 26 20263pm Sun, Jul 26 20264pm Sun, Jul 26 20265pm Sun, Jul 26 20266pm Sun, Jul 26 20267pm Sun, Jul 26 20268pm Sun, Jul 26 20269pm Sun, Jul 26 202610pm Sun, Jul 26 202611pm Sun, Jul 26 2026

Date	07/22												07/23
Hour (CDT)	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11
Temperature (°F)	72	73	74	73	73	73	72	71	69	67	65	63	62	60	60	58	58	57	57	60	65	69	72	75
Dewpoint (°F)	52	51	51	51	50	50	50	50	50	50	50	50	50	50	50	49	50	50	50	52	53	52	52	51
Heat Index (°F)																								75
Surface Wind (mph)	10	10	11	11	11	11	10	9	7	6	5	3	3	3	3	3	3	3	3	2	1	2	2	3
Wind Dir	NNE	NNE	NNE	NE	NE	NE	NE	NE	NE	NE	NE	NE	NNE	W	W	W	W	W	W	W	WSW	S	SSE	SSE
Gust	15	15		16	16	16
Sky Cover (%)	59	44	40	36	23	26	16	12	8	4	2	4	11	11	10	11	13	16	18	19	18	14	14	18
Precipitation Potential (%)	3	3	2	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Relative Humidity (%)	48	45	44	45	45	45	46	47	51	55	60	64	66	69	70	72	75	77	79	74	66	55	48	44
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date													07/24
Hour (CDT)	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11
Temperature (°F)	76	77	78	77	77	77	76	75	73	70	68	66	65	64	63	62	61	60	61	63	66	70	74	77
Dewpoint (°F)	51	51	51	51	51	51	50	51	51	52	53	54	55	55	55	55	55	55	55	55	56	56	56	55
Heat Index (°F)	76	77	78	77	77	77	76	75																77
Surface Wind (mph)	3	3	3	5	5	5	3	3	3	5	5	3	3	3	3	2	2	2	3	3	3	3	5	5
Wind Dir	SSE	SE	ESE	ESE	ESE	ESE	ESE	ESE	ESE	ESE	ESE	ESE	SE	SSE	SSE	S	S	S	S	S	SSE	SE	SE	SE
Gust
Sky Cover (%)	25	31	35	36	37	36	36	36	35	33	42	51	59	62	65	61	58	55	52	49	43	37	35	34
Precipitation Potential (%)	0	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 (%)	41	40	40	40	39	40	40	42	47	52	58	64	69	74	77	79	80	81	81	77	69	60	52	47
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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