Altamont, IL Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Altamont, IL.

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Current Conditions — Altamont, IL

EFFINGHAM (K1H2)

Clear

70.9 F

Humidity:58%

Wind Speed: mph

Barometer:29.75 in

Dewpoint:55.4 F

Visibility:10.00 mi

Precip:--

Heat Index:70.3 F

Wind Chill:NA

May 4 2026, 11:55 AM CDT

Observation Analysis for Altamont, IL →

5-Day Forecast — Altamont, IL

Monday

High 77 °F

Chance of T-storms

Monday
Night

Low 55 °F

T-storms Likely

Tuesday

High 62 °F

T-storms

Tuesday
Night

Low 44 °F

Rain

Wednesday

High 57 °F

Slight Chance of Rain Showers

Wednesday
Night

Low 41 °F

Mostly Cloudy

Thursday

High 60 °F

Partly Sunny

Thursday
Night

Low 44 °F

Mostly Clear

Friday

High 68 °F

Mostly Cloudy

Detailed Forecast — Altamont, IL

Monday

Chance of Thunderstorms. High near 77°F. Wind 14 to 20 mph, with gusts as high as 26 mph.

Monday Night

Thunderstorms Likely. Low around 55°F. Wind 7 to 16 mph, with gusts as high as 22 mph.

Tuesday

Thunderstorms. High near 62°F. Wind 7 to 12 mph, with gusts as high as 18 mph.

Tuesday Night

Rain. Low around 44°F. Wind 8 to 12 mph, with gusts as high as 18 mph.

Wednesday

Slight Chance of Rain Showers. High near 57°F. Wind 7 to 9 mph, with gusts as high as 14 mph.

Wednesday Night

Mostly Cloudy. Low around 41°F. Wind around 6 mph, with gusts as high as 12 mph.

Thursday

Partly Sunny. High near 60°F. Wind 5 to 10 mph, with gusts as high as 15 mph.

Thursday Night

Mostly Clear. Low around 44°F. Wind around 5 mph, with gusts as high as 8 mph.

Friday

Mostly Cloudy. High near 68°F. Wind 6 to 12 mph, with gusts as high as 17 mph.

Friday Night

Chance of Showers. Low around 48°F. Wind around 5 mph, with gusts as high as 9 mph.

Saturday

Mostly Sunny. High near 69°F. Wind 3 to 8 mph, with gusts as high as 13 mph.

Saturday Night

Slight Chance of Showers. Low around 50°F. Wind around 3 mph, with gusts as high as 8 mph.

Sunday

Chance of Showers. High near 71°F. Wind 5 to 9 mph, with gusts as high as 15 mph.

Observation History — Altamont, IL

Time	Wind (mph)	Vis (mi)	Weather	Precip (in)	Temperature (F)		Relative Humidity	Wind Chill (F)	Heat Index (F)	Pressure
Time	Wind (mph)	Vis (mi)	Weather	Precip (in)	Air	Dwpt	Relative Humidity	Wind Chill (F)	Heat Index (F)	altimeter (in)	sea level (mb)
11:55 AM CDT		10.00	Clear	--	70.9	55.4	58%	NA	70.3	29.75	1007.5
11:35 AM CDT	S 11.4 G 17.2	10.00	Partly Cloudy	--	72.9	56.7	57%	NA	72.5	29.76	1007.8
11:15 AM CDT	G 21.9	10.00	Mostly Cloudy	--	NULL		%	NA	NA		M
10:55 AM CDT	S 11.4	10.00	Partly Cloudy	--	70.0	56.7	63%	NA	NA	29.76	1007.8
10:35 AM CDT	S 11.4	10.00	Clear	--	68.9	57.7	68%	NA	NA	29.77	1008.1
10:15 AM CDT		10.00	Clear	--	NULL		%	NA	NA		M
09:55 AM CDT	S 6.9	10.00	Clear	--	64.4	57.0	77%	NA	NA	29.76	1007.8
09:35 AM CDT	S 8.1	10.00	Partly Cloudy	--	63.5	56.1	77%	NA	NA	29.78	1008.5
09:15 AM CDT	10.3	10.00	Partly Cloudy	--	62.6	55.9	79%	NA	NA	29.78	1008.5
08:55 AM CDT	S 8.1	10.00	Clear	--	60.4	55.0	82%	NA	NA	29.78	1008.5
08:35 AM CDT	S 9.2	10.00	Partly Cloudy	--	59.4	54.7	84%	NA	NA	29.79	1008.8
08:15 AM CDT	G 16.1	10.00	Partly Cloudy	--	NULL		%	NA	NA		M
07:55 AM CDT	9.2 G 19.6	10.00	Partly Cloudy	--	57.7	53.6	86%	NA	NA	29.78	1008.5
07:35 AM CDT	9.2	10.00	Partly Cloudy	--	57.2	53.6	88%	NA	NA	29.78	1008.5
07:15 AM CDT	10.3	10.00	Clear	--	57.2	53.2	87%	NA	NA	29.81	1009.2
06:55 AM CDT	11.4	10.00	Partly Cloudy	--	57.2	52.7	85%	NA	NA	29.81	1009.2
06:35 AM CDT	S 8.1	10.00	Partly Cloudy	--	56.5	53.1	88%	NA	NA	29.79	1008.8
06:15 AM CDT	8.1	10.00	Partly Cloudy	--	55.6	53.8	94%	NA	NA	29.78	1008.5
05:55 AM CDT	SE 6.9	10.00	Partly Cloudy	--	55.4	54.1	96%	NA	NA	29.78	1008.5
05:35 AM CDT	5.8	10.00	Partly Cloudy	--	55.4	54.5	97%	NA	NA	29.79	1008.8
05:15 AM CDT	S 8.1	10.00	Mostly Cloudy	--	55.2	55.2	100%	NA	NA	29.81	1009.2
04:55 AM CDT	SE 5.8	10.00	Cloudy	--	55.2	55.2	100%	NA	NA	29.81	1009.5
04:35 AM CDT	W 4.7	10.00	Cloudy	--	55.9	55.4	98%	NA	NA	29.83	1010.2
04:15 AM CDT	5.7	10.00	Mostly Cloudy	--	56.5	54.7	94%	NA	NA	29.78	1008.5