Point Forecast: Clarendon Hills IL  41.8N 87.94W	Last Update: 10:06 am CDT May 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: 11am Mon, May 18 202612pm Mon, May 18 20261pm Mon, May 18 20262pm Mon, May 18 20263pm Mon, May 18 20264pm Mon, May 18 20265pm Mon, May 18 20266pm Mon, May 18 20267pm Mon, May 18 20268pm Mon, May 18 20269pm Mon, May 18 202610pm Mon, May 18 202611pm Mon, May 18 202612am Tue, May 19 20261am Tue, May 19 20262am Tue, May 19 20263am Tue, May 19 20264am Tue, May 19 20265am Tue, May 19 20266am Tue, May 19 20267am Tue, May 19 20268am Tue, May 19 20269am Tue, May 19 202610am Tue, May 19 202611am Tue, May 19 202612pm Tue, May 19 20261pm Tue, May 19 20262pm Tue, May 19 20263pm Tue, May 19 20264pm Tue, May 19 20265pm Tue, May 19 20266pm Tue, May 19 20267pm Tue, May 19 20268pm Tue, May 19 20269pm Tue, May 19 202610pm Tue, May 19 202611pm Tue, May 19 202612am Wed, May 20 20261am Wed, May 20 20262am Wed, May 20 20263am Wed, May 20 20264am Wed, May 20 20265am Wed, May 20 20266am Wed, May 20 20267am Wed, May 20 20268am Wed, May 20 20269am Wed, May 20 202610am Wed, May 20 202611am Wed, May 20 202612pm Wed, May 20 20261pm Wed, May 20 20262pm Wed, May 20 20263pm Wed, May 20 20264pm Wed, May 20 20265pm Wed, May 20 20266pm Wed, May 20 20267pm Wed, May 20 20268pm Wed, May 20 20269pm Wed, May 20 202610pm Wed, May 20 202611pm Wed, May 20 202612am Thu, May 21 20261am Thu, May 21 20262am Thu, May 21 20263am Thu, May 21 20264am Thu, May 21 20265am Thu, May 21 20266am Thu, May 21 20267am Thu, May 21 20268am Thu, May 21 20269am Thu, May 21 202610am Thu, May 21 202611am Thu, May 21 202612pm Thu, May 21 20261pm Thu, May 21 20262pm Thu, May 21 20263pm Thu, May 21 20264pm Thu, May 21 20265pm Thu, May 21 20266pm Thu, May 21 20267pm Thu, May 21 20268pm Thu, May 21 20269pm Thu, May 21 202610pm Thu, May 21 202611pm Thu, May 21 202612am Fri, May 22 20261am Fri, May 22 20262am Fri, May 22 20263am Fri, May 22 20264am Fri, May 22 20265am Fri, May 22 20266am Fri, May 22 20267am Fri, May 22 20268am Fri, May 22 20269am Fri, May 22 202610am Fri, May 22 202611am Fri, May 22 202612pm Fri, May 22 20261pm Fri, May 22 20262pm Fri, May 22 20263pm Fri, May 22 20264pm Fri, May 22 20265pm Fri, May 22 20266pm Fri, May 22 20267pm Fri, May 22 20268pm Fri, May 22 20269pm Fri, May 22 202610pm Fri, May 22 2026

Date	05/18													05/19
Hour (CDT)	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10
Temperature (°F)	77	78	78	79	78	79	78	78	77	76	74	73	71	70	70	69	69	69	69	68	68	69	74	77
Dewpoint (°F)	66	66	66	66	66	66	66	65	65	65	65	65	64	63	63	63	63	64	64	64	64	64	65	66
Heat Index (°F)	77	78	78	79	79	79	78	78	77	76														77
Surface Wind (mph)	18	18	18	18	18	17	17	17	16	16	15	15	15	16	16	17	17	18	18	18	20	21	22	22
Wind Dir	SSW	SW	SSW	SSW	SW	SW	SW	SSW	SSW	SSW	S	S	S	S	S	S	SSW	SSW	SSW	SSW	SSW	SSW	SW	SW
Gust	28	29	30	29	28	28	25	24	23	23	23	24	25	25	26	29	29	29	29	30	30	30	31	32
Sky Cover (%)	100	100	99	95	90	90	93	85	77	76	76	56	64	65	62	61	58	70	62	67	73	73	68	73
Precipitation Potential (%)	80	54	23	13	11	12	8	8	20	18	16	14	14	14	23	23	23	49	49	49	50	50	50	35
Relative Humidity (%)	70	68	67	65	65	65	65	65	66	68	71	74	78	79	80	81	82	84	84	86	87	85	75	68
Rain	Ocnl	Chc	SChc	--	--	--	--	--	SChc	SChc	SChc	--	--	--	SChc	SChc	SChc	Chc	Chc	Chc	Chc	Chc	Chc	Chc
Thunder	Lkly	Chc	SChc	--	--	--	--	--	SChc	SChc	SChc	--	--	--	SChc	SChc	SChc	Chc	Chc	Chc	Chc	Chc	Chc	Chc
Date														05/20
Hour (CDT)	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10
Temperature (°F)	79	80	80	80	80	79	78	76	74	71	68	65	62	60	58	56	54	53	52	51	51	52	55	57
Dewpoint (°F)	66	66	66	66	65	64	62	60	58	56	54	52	50	49	47	46	45	44	43	42	42	42	41	40
Heat Index (°F)	81	82	82	82	81	79	78	77
Surface Wind (mph)	22	22	21	20	18	17	16	15	14	13	13	11	11	11	10	10	10	10	10	10	11	11	11	11
Wind Dir	SW	SW	WSW	WSW	W	W	W	WNW	WNW	WNW	NW	NW	NW	NNW	NNW	NNW	N	N	N	N	N	N	NNE	NNE
Gust	32	32	31	30	28	25	24	23	21	20	18	17	17	17	17	17	16	16	16	16	16	16
Sky Cover (%)	73	67	78	64	75	71	67	76	76	40	44	48	47	46	45	50	55	60	58	57	55	54	53	52
Precipitation Potential (%)	35	35	56	56	56	51	51	51	13	13	13	13	13	13	1	1	1	1	1	1	0	0	0	0
Relative Humidity (%)	65	63	63	61	61	59	58	56	57	59	61	63	65	66	68	69	70	71	72	73	71	66	60	54
Rain	Chc	Chc	Lkly	Lkly	Lkly	Chc	Chc	Chc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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