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St. Elmo IL Weather - Clear - 76°F
Clear
76°F
Updated 10:16 pm
Feels Like 81°F
Humidity 69%
Wind NW 3 mph
Barometer  30.06 in
Dew Point 66°F
St. Elmo IL Weather - Clear - 25°C
Clear
25°C
Updated 10:16 pm
Feels Like 27°C
Humidity 69%
Wind NW 5 km/h
Barometer  101.7 kPa
Dew Point 19°C
St. Elmo, IL Weather and Current Conditionsst. elmo il weather forecast

St. Elmo, IL Weather Forecast

St. Elmo Illinois WeatherSt. Elmo, Illinois Weather Weather Forecast
14 Day API St. Elmo, IL Weather Forecast. Note: Our 7 day St. Elmo, Illinois weather forecast is our most reliable, and specific forecast. This model should only be used as a probable scenario. Forecasting more than 7 days ahead is challenging.
St. Elmo, IL Weather Forecast Dated: 1016 PM Wed Sep 09 2026
Expect a very warm period with a mix of sun and clouds and occasional showers over the coming period. generally humid conditions and no major pressure swings will dominate.

Wednesday, September 9, 2026

Mid-Morning
St. Elmo Weather - 2026-09-09 - Morning - Sunny
84°F 29°C
Sunny
Mid-Afternoon
St. Elmo Weather - 2026-09-09 - Afternoon - Scattered Showers
92°F 33°C
Scattered Showers
Early-Evening
St. Elmo Weather - 2026-09-09 - Evening - Scattered Showers
86°F 30°C
Scattered Showers
Sizzling hot near 92°F 33°C with a heat index reaching 101°F 38°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds turning from the SW to the NW at 6 mph 10 km/h.

Thursday, September 10, 2026

Mid-Morning
St. Elmo Weather - 2026-09-10 - Morning - Scattered Showers
72°F 22°C
Scattered Showers
Mid-Afternoon
St. Elmo Weather - 2026-09-10 - Afternoon - Light Showers
67°F 19°C
Light Showers
Early-Evening
St. Elmo Weather - 2026-09-10 - Evening - Light Showers
69°F 21°C
Light Showers
Mildly cool near 67°F 19°C, scattered downpours possible, with steady humidity and steady pressure.

Friday, September 11, 2026

Mid-Morning
St. Elmo Weather - 2026-09-11 - Morning - Overcast
67°F 20°C
Overcast
Mid-Afternoon
St. Elmo Weather - 2026-09-11 - Afternoon - Overcast
77°F 25°C
Overcast
Early-Evening
St. Elmo Weather - 2026-09-11 - Evening - Overcast
71°F 22°C
Overcast
Enjoyable around 77°F 25°C, overcast throughout the day, with steady humidity and steady pressure. Winds switching from the E to the S at 6 mph 9 km/h.

Saturday, September 12, 2026

Mid-Morning
St. Elmo Weather - 2026-09-12 - Morning - Cloudy
72°F 22°C
Cloudy
Mid-Afternoon
St. Elmo Weather - 2026-09-12 - Afternoon - Cloudy
83°F 29°C
Cloudy
Early-Evening
St. Elmo Weather - 2026-09-12 - Evening - Overcast
80°F 27°C
Overcast
Warm and summery around 83°F 29°C (feels like 86°F 30°C), cloudy through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure.

Sunday, September 13, 2026

Mid-Morning
St. Elmo Weather - 2026-09-13 - Morning - Overcast
77°F 25°C
Overcast
Mid-Afternoon
St. Elmo Weather - 2026-09-13 - Afternoon - Overcast
91°F 33°C
Overcast
Early-Evening
St. Elmo Weather - 2026-09-13 - Evening - Sunny
85°F 30°C
Sunny
Very hot with a high of 91°F 33°C, overcast through the afternoon, turning sunny this evening, with lower humidity and steady pressure.

Monday, September 14, 2026

Mid-Morning
St. Elmo Weather - 2026-09-14 - Morning - Sunny
80°F 27°C
Sunny
Mid-Afternoon
St. Elmo Weather - 2026-09-14 - Afternoon - Sunny
98°F 36°C
Sunny
Early-Evening
St. Elmo Weather - 2026-09-14 - Evening - Cloudy
91°F 33°C
Cloudy
Very hot with temperatures reaching 98°F 36°C, sunny in the morning, becoming cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds moving from the S to the SSW at 12 mph 19 km/h. Gusts up to 25 mph 41 km/h.

Tuesday, September 15, 2026

Mid-Morning
St. Elmo Weather - 2026-09-15 - Morning - Sunny
78°F 26°C
Sunny
Mid-Afternoon
St. Elmo Weather - 2026-09-15 - Afternoon - Overcast
85°F 29°C
Overcast
Early-Evening
St. Elmo Weather - 2026-09-15 - Evening - Partly Cloudy
75°F 24°C
Partly Cloudy
Warm and summery around 85°F 29°C (feels like 88°F 31°C), sunny in the morning, cloudy in the afternoon, and overcast this evening, with steady humidity and steady pressure. Winds swinging from the NNW to the NNE at 8 mph 13 km/h.

Wednesday, September 16, 2026

Mid-Morning
St. Elmo Weather - 2026-09-16 - Morning - Scattered Showers
65°F 18°C
Scattered Showers
Mid-Afternoon
St. Elmo Weather - 2026-09-16 - Afternoon - Overcast
70°F 21°C
Overcast
Early-Evening
St. Elmo Weather - 2026-09-16 - Evening - Overcast
68°F 20°C
Overcast
Enjoyable around 70°F 21°C, scattered downpours possible, with steady humidity and steady pressure. Winds shifting from the ENE to the E at 9 mph 14 km/h.

Thursday, September 17, 2026

Mid-Morning
St. Elmo Weather - 2026-09-17 - Morning - Scattered Showers
70°F 21°C
Scattered Showers
Mid-Afternoon
St. Elmo Weather - 2026-09-17 - Afternoon - Scattered Showers
76°F 25°C
Scattered Showers
Early-Evening
St. Elmo Weather - 2026-09-17 - Evening - Light Showers
70°F 21°C
Light Showers
Mild temperatures up to 76°F 25°C, locally heavy downpours at times, with increasing humidity and barometric pressure falling. Winds turning from the SE to the SW at 13 mph 20 km/h. Gusts up to 31 mph 50 km/h.

Friday, September 18, 2026

Mid-Morning
St. Elmo Weather - 2026-09-18 - Morning - Partly Cloudy
57°F 14°C
Partly Cloudy
Mid-Afternoon
St. Elmo Weather - 2026-09-18 - Afternoon - Scattered Showers
65°F 18°C
Scattered Showers
Early-Evening
St. Elmo Weather - 2026-09-18 - Evening - Scattered Showers
61°F 16°C
Scattered Showers
Mildly cool near 65°F 18°C, periods of heavy rain and gusty conditions, with lower humidity and barometric pressure rising. Winds switching from the W to the NNW at 10 mph 16 km/h.

Saturday, September 19, 2026

Mid-Morning
St. Elmo Weather - 2026-09-19 - Morning - Sunny
59°F 15°C
Sunny
Mid-Afternoon
St. Elmo Weather - 2026-09-19 - Afternoon - Partly Cloudy
72°F 22°C
Partly Cloudy
Early-Evening
St. Elmo Weather - 2026-09-19 - Evening - Sunny
65°F 18°C
Sunny
Pleasant near 72°F 22°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure.

Sunday, September 20, 2026

Mid-Morning
St. Elmo Weather - 2026-09-20 - Morning - Sunny
59°F 15°C
Sunny
Mid-Afternoon
St. Elmo Weather - 2026-09-20 - Afternoon - Sunny
72°F 22°C
Sunny
Early-Evening
St. Elmo Weather - 2026-09-20 - Evening - Sunny
66°F 19°C
Sunny
Comfortable with temperatures reaching 72°F 22°C, sunny throughout the day, with lower humidity and steady pressure.

Monday, September 21, 2026

Mid-Morning
St. Elmo Weather - 2026-09-21 - Morning - Overcast
63°F 17°C
Overcast
Mid-Afternoon
St. Elmo Weather - 2026-09-21 - Afternoon - Overcast
76°F 25°C
Overcast
Early-Evening
St. Elmo Weather - 2026-09-21 - Evening - Partly Cloudy
71°F 22°C
Partly Cloudy
Enjoyable around 76°F 25°C, partly cloudy in the morning, becoming cloudy through the afternoon and evening, with lower humidity and steady pressure.

Tuesday, September 22, 2026

Mid-Morning
St. Elmo Weather - 2026-09-22 - Morning - Light Fog
71°F 21°C
Light Fog
Mid-Afternoon
St. Elmo Weather - 2026-09-22 - Afternoon - Sunny
83°F 29°C
Sunny
Early-Evening
St. Elmo Weather - 2026-09-22 - Evening - Sunny
77°F 25°C
Sunny
Warm temperatures up to 83°F 29°C, sunny throughout the day, with lower humidity and steady pressure. Winds moving from the S to the SSE at 6 mph 10 km/h.

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Weather by the Numbers

Wed, 9th
St. Elmo IL Weather - Wednesday, Sep 9, 2026 - Light Drizzle
Hi: 93°F 34°C
Lo: 71°F 22°C
Sunrise 06:31 AM
Sunset 07:13 PM
Wind W 14 mph22 km/h
Dew Point 73°F23°C
uv Index 7
Barometric Pressure 30.03 in1017 mb
POP 36% *
Humidity 68%
Thu, 10th
St. Elmo IL Weather - Thursday, Sep 10, 2026 - Light Rain Shower
Hi: 75°F 24°C
Lo: 66°F 19°C
Sunrise 06:32 AM
Sunset 07:12 PM
Wind N 11 mph18 km/h
Dew Point 67°F19°C
uv Index 3
Barometric Pressure 30 in1016 mb
POP 82% *
Humidity 96%
Fri, 11th
St. Elmo IL Weather - Friday, Sep 11, 2026 - Overcast
Hi: 78°F 25°C
Lo: 65°F 18°C
Sunrise 06:33 AM
Sunset 07:10 PM
Wind SE 6 mph10 km/h
Dew Point 61°F16°C
uv Index 5
Barometric Pressure 30 in1016 mb
POP 15% *
Humidity 64%
Sat, 12th
St. Elmo IL Weather - Saturday, Sep 12, 2026 - Partly Cloudy
Hi: 85°F 29°C
Lo: 67°F 20°C
Sunrise 06:34 AM
Sunset 07:08 PM
Wind SW 5 mph9 km/h
Dew Point 65°F19°C
uv Index 7
Barometric Pressure 29.94 in1014 mb
POP 5% *
Humidity 58%
Sun, 13th
St. Elmo IL Weather - Sunday, Sep 13, 2026 - Sunny
Hi: 91°F 33°C
Lo: 71°F 21°C
Sunrise 06:35 AM
Sunset 07:07 PM
Wind ESE 4 mph6 km/h
Dew Point 63°F17°C
uv Index 6
Barometric Pressure 30.03 in1017 mb
POP 1% *
Humidity 45%
Mon, 14th
St. Elmo IL Weather - Monday, Sep 14, 2026 - Sunny
Hi: 98°F 37°C
Lo: 74°F 23°C
Sunrise 06:36 AM
Sunset 07:05 PM
Wind SW 13 mph21 km/h
Dew Point 63°F17°C
uv Index 8
Barometric Pressure 29.94 in1014 mb
POP 1% *
Humidity 37%
Tue, 15th
St. Elmo IL Weather - Tuesday, Sep 15, 2026 - Sunny
Hi: 86°F 30°C
Lo: 65°F 19°C
Sunrise 06:37 AM
Sunset 07:04 PM
Wind NW 8 mph13 km/h
Dew Point 68°F20°C
uv Index 7
Barometric Pressure 30.09 in1019 mb
POP 8% *
Humidity 58%
Wed, 16th
St. Elmo IL Weather - Wednesday, Sep 16, 2026 - Overcast
Hi: 71°F 22°C
Lo: 63°F 17°C
Sunrise 06:38 AM
Sunset 07:02 PM
Wind ENE 9 mph15 km/h
Dew Point 50°F10°C
uv Index 4
Barometric Pressure 30.27 in1025 mb
POP 12% *
Humidity 53%
Thu, 17th
St. Elmo IL Weather - Thursday, Sep 17, 2026 - Patchy Rain Nearby
Hi: 85°F 29°C
Lo: 64°F 18°C
Sunrise 06:38 AM
Sunset 07:00 PM
Wind SW 16 mph25 km/h
Dew Point 65°F18°C
uv Index 6
Barometric Pressure 30 in1016 mb
POP 11% *
Humidity 59%
Fri, 18th
St. Elmo IL Weather - Friday, Sep 18, 2026 - Patchy Rain Nearby
Hi: 66°F 19°C
Lo: 54°F 12°C
Sunrise 06:39 AM
Sunset 06:59 PM
Wind NW 13 mph21 km/h
Dew Point 55°F13°C
uv Index 4
Barometric Pressure 30.03 in1017 mb
POP 22% *
Humidity 80%
Sat, 19th
St. Elmo IL Weather - Saturday, Sep 19, 2026 - Sunny
Hi: 73°F 23°C
Lo: 53°F 12°C
Sunrise 06:40 AM
Sunset 06:57 PM
Wind NNW 5 mph8 km/h
Dew Point 50°F10°C
uv Index 5
Barometric Pressure 30.18 in1022 mb
POP 4% *
Humidity 54%
Sun, 20th
St. Elmo IL Weather - Sunday, Sep 20, 2026 - Sunny
Hi: 73°F 23°C
Lo: 52°F 11°C
Sunrise 06:41 AM
Sunset 06:55 PM
Wind E 4 mph7 km/h
Dew Point 48°F9°C
uv Index 6
Barometric Pressure 30.15 in1021 mb
POP 2% *
Humidity 49%
Mon, 21st
St. Elmo IL Weather - Monday, Sep 21, 2026 - Sunny
Hi: 77°F 25°C
Lo: 55°F 13°C
Sunrise 06:42 AM
Sunset 06:54 PM
Wind SE 4 mph6 km/h
Dew Point 49°F10°C
uv Index 6
Barometric Pressure 30.06 in1018 mb
POP 6% *
Humidity 44%
Tue, 22nd
St. Elmo IL Weather - Tuesday, Sep 22, 2026 - Sunny
Hi: 84°F 29°C
Lo: 63°F 17°C
Sunrise 06:43 AM
Sunset 06:52 PM
Wind S 9 mph14 km/h
Dew Point 60°F16°C
uv Index 7
Barometric Pressure 30.03 in1017 mb
POP 2% *
Humidity 53%
* POP = Probability of Precipitation. Data for 12:00 PM.