Point Forecast: Markham IL  41.6N 87.7W	Last Update: 2:56 am CDT Sep 19, 2024

[hide menu]

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 Haines Index Lightning Activity Level 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: 3am Thu, Sep 19 20244am Thu, Sep 19 20245am Thu, Sep 19 20246am Thu, Sep 19 20247am Thu, Sep 19 20248am Thu, Sep 19 20249am Thu, Sep 19 202410am Thu, Sep 19 202411am Thu, Sep 19 202412pm Thu, Sep 19 20241pm Thu, Sep 19 20242pm Thu, Sep 19 20243pm Thu, Sep 19 20244pm Thu, Sep 19 20245pm Thu, Sep 19 20246pm Thu, Sep 19 20247pm Thu, Sep 19 20248pm Thu, Sep 19 20249pm Thu, Sep 19 202410pm Thu, Sep 19 202411pm Thu, Sep 19 202412am Fri, Sep 20 20241am Fri, Sep 20 20242am Fri, Sep 20 20243am Fri, Sep 20 20244am Fri, Sep 20 20245am Fri, Sep 20 20246am Fri, Sep 20 20247am Fri, Sep 20 20248am Fri, Sep 20 20249am Fri, Sep 20 202410am Fri, Sep 20 202411am Fri, Sep 20 202412pm Fri, Sep 20 20241pm Fri, Sep 20 20242pm Fri, Sep 20 20243pm Fri, Sep 20 20244pm Fri, Sep 20 20245pm Fri, Sep 20 20246pm Fri, Sep 20 20247pm Fri, Sep 20 20248pm Fri, Sep 20 20249pm Fri, Sep 20 202410pm Fri, Sep 20 202411pm Fri, Sep 20 202412am Sat, Sep 21 20241am Sat, Sep 21 20242am Sat, Sep 21 20243am Sat, Sep 21 20244am Sat, Sep 21 20245am Sat, Sep 21 20246am Sat, Sep 21 20247am Sat, Sep 21 20248am Sat, Sep 21 20249am Sat, Sep 21 202410am Sat, Sep 21 202411am Sat, Sep 21 202412pm Sat, Sep 21 20241pm Sat, Sep 21 20242pm Sat, Sep 21 20243pm Sat, Sep 21 20244pm Sat, Sep 21 20245pm Sat, Sep 21 20246pm Sat, Sep 21 20247pm Sat, Sep 21 20248pm Sat, Sep 21 20249pm Sat, Sep 21 202410pm Sat, Sep 21 202411pm Sat, Sep 21 202412am Sun, Sep 22 20241am Sun, Sep 22 20242am Sun, Sep 22 20243am Sun, Sep 22 20244am Sun, Sep 22 20245am Sun, Sep 22 20246am Sun, Sep 22 20247am Sun, Sep 22 20248am Sun, Sep 22 20249am Sun, Sep 22 202410am Sun, Sep 22 202411am Sun, Sep 22 202412pm Sun, Sep 22 20241pm Sun, Sep 22 20242pm Sun, Sep 22 20243pm Sun, Sep 22 20244pm Sun, Sep 22 20245pm Sun, Sep 22 20246pm Sun, Sep 22 20247pm Sun, Sep 22 20248pm Sun, Sep 22 20249pm Sun, Sep 22 202410pm Sun, Sep 22 202411pm Sun, Sep 22 202412am Mon, Sep 23 20241am Mon, Sep 23 20242am Mon, Sep 23 20243am Mon, Sep 23 20244am Mon, Sep 23 20245am Mon, Sep 23 20246am Mon, Sep 23 20247am Mon, Sep 23 20248am Mon, Sep 23 20249am Mon, Sep 23 202410am Mon, Sep 23 202411am Mon, Sep 23 202412pm Mon, Sep 23 20241pm Mon, Sep 23 20242pm Mon, Sep 23 2024

Date	09/19																					09/20
Hour (CDT)	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02
Temperature (°F)	65	64	62	61	62	66	72	78	82	85	87	88	88	87	85	83	80	77	75	73	72	71	70	70
Dewpoint (°F)	49	49	50	50	51	52	53	53	51	49	49	50	50	49	50	50	50	50	51	51	51	51	51	51
Heat Index (°F)								78	81	83	84	85	85	84	83	81	80	77	75
Surface Wind (mph)	2	1	1	1	1	2	2	2	2	3	3	5	5	5	5	3	5	6	7	7	7	7	8	8
Wind Dir	SSE	S	S	S	S	S	S	S	S	S	SSW	SSW	SSW	SSW	SW	S	SSE	SE	SE	SSE	SSE	SSE	SSE	S
Gust
Sky Cover (%)	26	25	20	8	4	1	2	4	4	3	2	3	6	10	19	35	43	32	19	16	11	18	35	40
Precipitation Potential (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	10	10
Relative Humidity (%)	56	58	65	67	67	61	51	42	34	29	27	27	27	27	30	32	35	39	43	46	48	49	51	51
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date																						09/21
Hour (CDT)	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02
Temperature (°F)	70	69	68	68	67	70	72	76	78	79	80	82	84	84	84	81	79	77	75	73	71	70	69	68
Dewpoint (°F)	51	51	55	57	59	60	62	64	65	65	66	66	64	61	60	59	61	61	60	59	59	59	59	59
Heat Index (°F)								76	78	79	82	84	85	84	84	81	79	77	75
Surface Wind (mph)	7	7	7	6	6	7	8	9	9	9	9	8	8	7	7	6	5	3	2	2	2	2	2	2
Wind Dir	S	S	S	S	S	S	SSW	SSW	SSW	SW	SW	WSW	W	W	WNW	NNW	NNW	N	N	NNE	N	NW	WNW	NW
Gust									14	14	14	13	13
Sky Cover (%)	59	74	72	70	53	40	36	40	41	40	53	51	43	36	28	22	21	23	25	27	25	23	20	24
Precipitation Potential (%)	10	32	32	32	30	30	30	17	17	17	22	22	22	14	14	14	3	3	3	3	3	3	4	4
Relative Humidity (%)	51	53	63	68	75	71	71	66	64	62	62	58	51	46	44	47	54	58	60	62	66	68	70	73
Rain	--	Chc	Chc	Chc	Chc	Chc	Chc	SChc	SChc	SChc	SChc	SChc	SChc	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	Chc	Chc	Chc	Chc	Chc	Chc	SChc	SChc	SChc	SChc	SChc	SChc	--	--	--	--	--	--	--	--	--	--	--

International System of Units Forecast Discussion 7-Day Forecast Hourly Weather Graph Graphical Hazardous Weather Outlook Hazardous Weather Regional Weather Conditions Past Weather Information