Point Forecast: Saint Charles IL  41.9N 88.32W	Last Update: 11:41 am CDT Aug 11, 2026

[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 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 Tue, Aug 11 202612pm Tue, Aug 11 20261pm Tue, Aug 11 20262pm Tue, Aug 11 20263pm Tue, Aug 11 20264pm Tue, Aug 11 20265pm Tue, Aug 11 20266pm Tue, Aug 11 20267pm Tue, Aug 11 20268pm Tue, Aug 11 20269pm Tue, Aug 11 202610pm Tue, Aug 11 202611pm Tue, Aug 11 202612am Wed, Aug 12 20261am Wed, Aug 12 20262am Wed, Aug 12 20263am Wed, Aug 12 20264am Wed, Aug 12 20265am Wed, Aug 12 20266am Wed, Aug 12 20267am Wed, Aug 12 20268am Wed, Aug 12 20269am Wed, Aug 12 202610am Wed, Aug 12 202611am Wed, Aug 12 202612pm Wed, Aug 12 20261pm Wed, Aug 12 20262pm Wed, Aug 12 20263pm Wed, Aug 12 20264pm Wed, Aug 12 20265pm Wed, Aug 12 20266pm Wed, Aug 12 20267pm Wed, Aug 12 20268pm Wed, Aug 12 20269pm Wed, Aug 12 202610pm Wed, Aug 12 202611pm Wed, Aug 12 202612am Thu, Aug 13 20261am Thu, Aug 13 20262am Thu, Aug 13 20263am Thu, Aug 13 20264am Thu, Aug 13 20265am Thu, Aug 13 20266am Thu, Aug 13 20267am Thu, Aug 13 20268am Thu, Aug 13 20269am Thu, Aug 13 202610am Thu, Aug 13 202611am Thu, Aug 13 202612pm Thu, Aug 13 20261pm Thu, Aug 13 20262pm Thu, Aug 13 20263pm Thu, Aug 13 20264pm Thu, Aug 13 20265pm Thu, Aug 13 20266pm Thu, Aug 13 20267pm Thu, Aug 13 20268pm Thu, Aug 13 20269pm Thu, Aug 13 202610pm Thu, Aug 13 202611pm Thu, Aug 13 202612am Fri, Aug 14 20261am Fri, Aug 14 20262am Fri, Aug 14 20263am Fri, Aug 14 20264am Fri, Aug 14 20265am Fri, Aug 14 20266am Fri, Aug 14 20267am Fri, Aug 14 20268am Fri, Aug 14 20269am Fri, Aug 14 202610am Fri, Aug 14 202611am Fri, Aug 14 202612pm Fri, Aug 14 20261pm Fri, Aug 14 20262pm Fri, Aug 14 20263pm Fri, Aug 14 20264pm Fri, Aug 14 20265pm Fri, Aug 14 20266pm Fri, Aug 14 20267pm Fri, Aug 14 20268pm Fri, Aug 14 20269pm Fri, Aug 14 202610pm Fri, Aug 14 202611pm Fri, Aug 14 202612am Sat, Aug 15 20261am Sat, Aug 15 20262am Sat, Aug 15 20263am Sat, Aug 15 20264am Sat, Aug 15 20265am Sat, Aug 15 20266am Sat, Aug 15 20267am Sat, Aug 15 20268am Sat, Aug 15 20269am Sat, Aug 15 202610am Sat, Aug 15 202611am Sat, Aug 15 202612pm Sat, Aug 15 20261pm Sat, Aug 15 20262pm Sat, Aug 15 20263pm Sat, Aug 15 20264pm Sat, Aug 15 20265pm Sat, Aug 15 20266pm Sat, Aug 15 20267pm Sat, Aug 15 20268pm Sat, Aug 15 20269pm Sat, Aug 15 202610pm Sat, Aug 15 2026

Date	08/11													08/12
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	79	79	79	81	81	80	80	77	75	74	72	72	71	71	70	69	69	68	69	71	72	75
Dewpoint (°F)	73	73	73	73	73	73	73	73	73	73	72	71	71	70	70	70	70	69	69	68	69	70	72	73
Heat Index (°F)	77	78	79	79	83	86	85	85	83	77	75													75
Surface Wind (mph)	6	6	6	6	6	5	5	5	3	3	3	3	2	2	2	2	2	2	2	2	2	2	2	3
Wind Dir	WNW	SSE	S	SSE	S	S	SE	SE	SSE	SE	E	ESE	ESE	E	ENE	ENE	ENE	ENE	ENE	ENE	E	SE	ESE	S
Gust		11	11	11
Sky Cover (%)	80	79	85	75	82	75	65	64	66	52	62	42	33	42	58	69	66	74	62	70	67	84	82	83
Precipitation Potential (%)	89	48	46	51	34	46	48	30	25	27	28	14	20	28	41	31	30	14	9	12	29	41	40	60
Relative Humidity (%)	88	86	82	83	81	77	78	77	80	85	91	92	96	96	97	98	100	100	100	100	100	99	98	93
Rain	Ocnl	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	--	SChc	Chc	Chc	Chc	Chc	--	--	--	Chc	Chc	Chc	Lkly
Thunder	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	--	SChc	SChc	Chc	Chc	Chc	--	--	--	SChc	SChc	SChc	--
Date														08/13
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	79	80	79	81	81	81	80	79	77	75	73	72	71	70	70	69	69	68	68	68	70	72	74
Dewpoint (°F)	73	73	73	73	73	73	72	72	73	72	72	71	71	70	69	69	69	69	68	68	68	70	71	72
Heat Index (°F)	77	79	83	83	86	85	85	85	79	77	75
Surface Wind (mph)	3	3	5	5	5	5	5	5	3	3	2	3	2	2	2	2	2	3	2	2	2	3	5	5
Wind Dir	E	SSE	WSW	SSE	SW	S	SSE	SW	W	ESE	E	E	E	E	ENE	E	E	E	ESE	E	E	SE	ESE	E
Gust
Sky Cover (%)	47	54	65	49	53	52	45	44	42	43	50	56	63	77	70	86	83	77	85	82	69	73	81	88
Precipitation Potential (%)	51	51	45	50	59	24	25	22	10	14	10	10	22	33	44	54	58	43	26	44	62	62	62	62
Relative Humidity (%)	89	83	81	80	75	77	76	76	82	84	91	93	96	96	97	99	100	100	100	100	100	99	97	94
Rain	Chc	Chc	Chc	Chc	Lkly	SChc	Chc	SChc	--	--	--	--	SChc	Chc	Chc	Chc	Lkly	Chc	Chc	Chc	Lkly	Lkly	Lkly	Lkly
Thunder	--	--	SChc	SChc	SChc	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