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Current weather in St. Elmo is scattered clouds.

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Weather data for St. Elmo is updated regularly with the latest available observations and forecasts.

Now · 11:57 PM

St. Elmo Weather & Hourly Forecast

United States · Illinois · 62458

75°F

Partly cloudy night

Feels like: 81°F

💧 Humidity 82% 🌡 Pressure 30.00 inHg 💨 Wind 4 mph 👁 Visibility 15.4 mi ☁ Clouds 48% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for St. Elmo

Tomorrow

12:00 AM

Partly cloudy night

75° 💧 0.348 in 💨 4 mph H 82%30.00 inHg

3:00 AM

Severe thunderstorms

73° 💧 0.556 in 💨 5 mph H 98%30.00 inHg

6:00 AM

Thunderstorms

71° 💧 0.671 in 💨 6 mph H 99%29.97 inHg

9:00 AM

Thunderstorms

73° 💧 0.285 in 💨 4 mph H 98%30.03 inHg

12:00 PM

Overcast

78° 💧 0.011 in 💨 2 mph H 77%29.97 inHg

3:00 PM

Light thunderstorms

76° 💧 0.046 in 💨 8 mph H 86%29.91 inHg

6:00 PM

Light rain

74° 💧 0.008 in 💨 5 mph H 89%29.91 inHg

9:00 PM

Mostly cloudy night

71° 💧 0.000 in 💨 4 mph H 94%29.94 inHg

Friday

12:00 AM

Clear night

69° 💧 None 💨 4 mph H 97%29.94 inHg

3:00 AM

Partly cloudy night

68° 💧 None 💨 4 mph H 99%29.94 inHg

6:00 AM

Partly cloudy night

68° 💧 None 💨 5 mph H 98%29.97 inHg

9:00 AM

Sunny

71° 💧 0.000 in 💨 6 mph H 88%29.97 inHg

12:00 PM

Mostly sunny

79° 💧 0.012 in 💨 6 mph H 70%29.94 inHg

3:00 PM

Light rain

82° 💧 0.019 in 💨 4 mph H 61%29.88 inHg

6:00 PM

Sunny

80° 💧 None 💨 4 mph H 71%29.85 inHg

9:00 PM

Clear night

73° 💧 None 💨 5 mph H 87%29.88 inHg

Tomorrow

12:00 AM

Partly cloudy night

75° 💧 None 💨 4 mph H 82%30.00 inHg

1:00 AM

Light thunderstorms

74° 💧 0.046 in 💨 7 mph H 91%29.97 inHg

2:00 AM

Severe thunderstorms

72° 💧 0.302 in 💨 6 mph H 98%30.03 inHg

3:00 AM

Severe thunderstorms

73° 💧 0.370 in 💨 5 mph H 98%30.00 inHg

4:00 AM

Light thunderstorms

72° 💧 0.071 in 💨 2 mph H 98%29.97 inHg

5:00 AM

Thunderstorms

71° 💧 0.115 in 💨 4 mph H 99%29.97 inHg

6:00 AM

Thunderstorms

71° 💧 0.102 in 💨 6 mph H 99%29.97 inHg

7:00 AM

Severe thunderstorms

71° 💧 0.391 in 💨 2 mph H 98%30.00 inHg

8:00 AM

Thunderstorms

71° 💧 0.178 in 💨 3 mph H 99%29.97 inHg

9:00 AM

Thunderstorms

73° 💧 0.202 in 💨 4 mph H 98%30.03 inHg

10:00 AM

Light thunderstorms

73° 💧 0.065 in 💨 5 mph H 96%30.00 inHg

11:00 AM

Light rain

75° 💧 0.018 in 💨 3 mph H 89%30.00 inHg

12:00 PM

Overcast

78° 💧 0.003 in 💨 2 mph H 77%29.97 inHg

1:00 PM

Overcast

78° 💧 0.000 in 💨 4 mph H 78%29.94 inHg

2:00 PM

Light rain

78° 💧 0.007 in 💨 8 mph H 81%29.91 inHg

3:00 PM

Light thunderstorms

76° 💧 0.015 in 💨 8 mph H 86%29.91 inHg

4:00 PM

Light thunderstorms

75° 💧 0.020 in 💨 5 mph H 89%29.91 inHg

5:00 PM

Light rain

74° 💧 0.010 in 💨 5 mph H 90%29.91 inHg

6:00 PM

Light rain

74° 💧 0.004 in 💨 5 mph H 89%29.91 inHg

7:00 PM

Overcast

74° 💧 0.003 in 💨 3 mph H 92%29.91 inHg

8:00 PM

Mostly cloudy night

72° 💧 0.000 in 💨 4 mph H 94%29.91 inHg

9:00 PM

Mostly cloudy night

71° 💧 0.000 in 💨 4 mph H 94%29.94 inHg

10:00 PM

Mostly clear night

70° 💧 None 💨 5 mph H 94%29.94 inHg

11:00 PM

Mostly clear night

70° 💧 None 💨 4 mph H 95%29.97 inHg

Friday

12:00 AM

Clear night

69° 💧 None 💨 4 mph H 97%29.94 inHg

1:00 AM

Clear night

69° 💧 None 💨 4 mph H 98%29.94 inHg

2:00 AM

Clear night

69° 💧 None 💨 4 mph H 98%29.94 inHg

3:00 AM

Partly cloudy night

68° 💧 None 💨 4 mph H 99%29.94 inHg

4:00 AM

Mostly cloudy night

68° 💧 None 💨 4 mph H 99%29.94 inHg

5:00 AM

Mostly clear night

68° 💧 None 💨 5 mph H 99%29.94 inHg

6:00 AM

Partly cloudy night

68° 💧 None 💨 5 mph H 98%29.97 inHg

7:00 AM

Partly cloudy

68° 💧 None 💨 6 mph H 98%29.97 inHg

8:00 AM

Partly cloudy

69° 💧 None 💨 6 mph H 95%29.97 inHg

9:00 AM

Sunny

71° 💧 0.000 in 💨 6 mph H 88%29.97 inHg

10:00 AM

Sunny

74° 💧 None 💨 6 mph H 79%29.97 inHg

11:00 AM

Sunny

77° 💧 None 💨 6 mph H 76%29.97 inHg

12:00 PM

Mostly sunny

79° 💧 0.001 in 💨 6 mph H 70%29.94 inHg

1:00 PM

Light rain

80° 💧 0.005 in 💨 6 mph H 67%29.91 inHg

2:00 PM

Light rain

82° 💧 0.007 in 💨 5 mph H 64%29.91 inHg

3:00 PM

Light rain

82° 💧 0.007 in 💨 4 mph H 61%29.88 inHg

4:00 PM

Light rain

83° 💧 0.010 in 💨 3 mph H 60%29.85 inHg

5:00 PM

Mostly sunny

82° 💧 0.002 in 💨 3 mph H 63%29.85 inHg

6:00 PM

Sunny

80° 💧 None 💨 4 mph H 71%29.85 inHg

7:00 PM

Sunny

77° 💧 None 💨 4 mph H 80%29.85 inHg

8:00 PM

Clear night

74° 💧 None 💨 4 mph H 85%29.85 inHg

9:00 PM

Clear night

73° 💧 None 💨 5 mph H 87%29.88 inHg

10:00 PM

Clear night

72° 💧 None 💨 5 mph H 89%29.88 inHg

11:00 PM

Clear night

72° 💧 None 💨 5 mph H 92%29.88 inHg

Saturday

12:00 AM

Clear night

71° 💧 None 💨 6 mph H 96%29.88 inHg

1:00 AM

Clear night

71° 💧 None 💨 5 mph H 97%29.88 inHg

2:00 AM

Clear night

71° 💧 None 💨 4 mph H 98%29.88 inHg

3:00 AM

Clear night

70° 💧 None 💨 4 mph H 98%29.88 inHg

4:00 AM

Mostly clear night

69° 💧 None 💨 5 mph H 98%29.88 inHg

5:00 AM

Partly cloudy night

69° 💧 None 💨 5 mph H 98%29.88 inHg

6:00 AM

Mostly clear night

69° 💧 None 💨 5 mph H 99%29.88 inHg

7:00 AM

Mostly cloudy

69° 💧 None 💨 4 mph H 99%29.88 inHg

4:00 PM

Light rain

86° 💧 None 💨 5 mph H 59%29.85 inHg

7:00 PM

Partly cloudy

78° 💧 None 💨 4 mph H 84%29.91 inHg

10:00 PM

Clear night

75° 💧 None 💨 3 mph H 91%29.97 inHg

Sunday

1:00 AM

Clear night

73° 💧 None 💨 5 mph H 94%29.97 inHg

4:00 AM

Mostly clear night

71° 💧 None 💨 5 mph H 97%29.97 inHg

7:00 AM

Mostly sunny

70° 💧 None 💨 5 mph H 98%30.03 inHg

10:00 AM

Partly cloudy

78° 💧 None 💨 3 mph H 79%30.06 inHg

1:00 PM

Partly cloudy

83° 💧 None 💨 3 mph H 66%30.03 inHg

4:00 PM

Mostly sunny

84° 💧 None 💨 3 mph H 59%30.00 inHg

7:00 PM

Sunny

78° 💧 None 💨 3 mph H 76%30.00 inHg

10:00 PM

Mostly clear night

73° 💧 None 💨 4 mph H 81%30.03 inHg

Monday

1:00 AM

Clear night

70° 💧 None 💨 5 mph H 79%30.06 inHg

4:00 AM

Partly cloudy night

68° 💧 None 💨 6 mph H 75%30.06 inHg

7:00 AM

Mostly sunny

67° 💧 None 💨 7 mph H 79%30.09 inHg

10:00 AM

Sunny

75° 💧 None 💨 7 mph H 71%30.09 inHg

1:00 PM

Sunny

84° 💧 None 💨 7 mph H 67%30.06 inHg

4:00 PM

Mostly sunny

87° 💧 None 💨 8 mph H 61%30.00 inHg

7:00 PM

Sunny

82° 💧 None 💨 6 mph H 77%29.97 inHg

10:00 PM

Clear night

79° 💧 None 💨 11 mph H 80%29.97 inHg

Tuesday

1:00 AM

Clear night

76° 💧 None 💨 7 mph H 87%30.03 inHg

4:00 AM

Clear night

74° 💧 None 💨 7 mph H 87%30.00 inHg

7:00 AM

Sunny

74° 💧 None 💨 7 mph H 85%30.06 inHg

10:00 AM

Sunny

83° 💧 None 💨 7 mph H 71%30.06 inHg

1:00 PM

Mostly sunny

90° 💧 None 💨 8 mph H 55%30.06 inHg

7:00 PM

Sunny

84° 💧 None 💨 5 mph H 74%30.03 inHg

Wednesday

1:00 AM

Light rain

77° 💧 None 💨 10 mph H 92%30.06 inHg

7:00 AM

Overcast

72° 💧 None 💨 6 mph H 94%30.12 inHg

1:00 PM

Overcast

68° 💧 None 💨 9 mph H 80%30.15 inHg

7:00 PM

Partly cloudy

72° 💧 None 💨 6 mph H 79%30.18 inHg

Thursday

1:00 AM

Mostly clear night

75° 💧 None 💨 3 mph H 79%30.12 inHg

7:00 AM

Overcast

72° 💧 None 💨 4 mph H 85%30.09 inHg

1:00 PM

Moderate rain

71° 💧 None 💨 3 mph H 94%30.06 inHg

7:00 PM

Light rain

75° 💧 None 💨 5 mph H 91%30.03 inHg

Friday

1:00 AM

Overcast night

73° 💧 None 💨 8 mph H 96%29.97 inHg

7:00 AM

Mostly sunny

66° 💧 None 💨 8 mph H 96%30.06 inHg

1:00 PM

Sunny

62° 💧 None 💨 7 mph H 97%30.09 inHg

7:00 PM

Partly cloudy night

73° 💧 None 💨 7 mph H 65%30.12 inHg

Saturday

1:00 AM

Clear night

69° 💧 None 💨 5 mph H 73%30.03 inHg

7:00 AM

Mostly sunny

62° 💧 None 💨 7 mph H 82%30.06 inHg

1:00 PM

Sunny

57° 💧 None 💨 5 mph H 92%30.09 inHg

7:00 PM

Partly cloudy night

73° 💧 None 💨 9 mph H 48%30.06 inHg

Sunday

1:00 AM

Clear night

66° 💧 None 💨 5 mph H 67%30.00 inHg

7:00 AM

Sunny

60° 💧 None 💨 4 mph H 84%30.03 inHg

1:00 PM

Sunny

57° 💧 None 💨 5 mph H 90%30.12 inHg

7:00 PM

Mostly clear night

72° 💧 None 💨 9 mph H 59%30.12 inHg

Monday

1:00 AM

Mostly clear night

65° 💧 None 💨 5 mph H 70%30.09 inHg

7:00 AM

Overcast

58° 💧 None 💨 6 mph H 80%30.15 inHg

1:00 PM

Partly cloudy

53° 💧 None 💨 10 mph H 79%30.21 inHg

7:00 PM

Overcast night

66° 💧 None 💨 9 mph H 56%30.21 inHg

Tuesday

1:00 AM

Overcast night

63° 💧 None 💨 8 mph H 62%30.21 inHg

7:00 AM

Overcast

60° 💧 None 💨 10 mph H 65%30.24 inHg

1:00 PM

Mostly cloudy

55° 💧 None 💨 10 mph H 68%30.33 inHg

7:00 PM

Mostly clear night

65° 💧 None 💨 8 mph H 54%30.30 inHg

Wednesday

1:00 AM

Clear night

61° 💧 None 💨 6 mph H 67%30.27 inHg

7:00 AM

Sunny

53° 💧 None 💨 7 mph H 72%30.30 inHg

1:00 PM

Sunny

49° 💧 None 💨 6 mph H 82%30.36 inHg

7:00 PM

Mostly clear night

66° 💧 None 💨 5 mph H 54%30.30 inHg

Thursday

1:00 AM

Mostly cloudy night

62° 💧 None 💨 2 mph H 67%30.24 inHg

7:00 AM

Mostly cloudy

54° 💧 None 💨 4 mph H 81%30.18 inHg

1:00 PM

Overcast

56° 💧 None 💨 6 mph H 82%30.12 inHg

In St. Elmo and, more broadly, across the state of Illinois: Tonight, temperatures will remain mild to warm, ranging from 74 to 75 degrees Fahrenheit, with mostly cloudy skies overhead. Light northwest winds will continue, with speeds up to 7 mph, occasionally gusting to 16 mph. No precipitation is expected through the evening and into the early night hours, so dry conditions will persist. The breeze may bring some slight movement to the clouds, but overall, skies will stay mostly cloudy. Temperatures are likely to stay steady or gradually decrease slightly later in the night. It should be a relatively calm and dry evening, making for a comfortable night ahead.

15-Day Weather Outlook for St. Elmo

TomorrowTomorrow

Light thunderstorms 85°/71° 💧 None 💨 8 mph

Friday, Sep 11Fri Sep 11

Overcast 83°/68° 💧 None 💨 6 mph

Saturday, Sep 12Sat Sep 12

Mostly sunny 85°/69° 💧 2.787 in 💨 8 mph

Sunday, Sep 13Sun Sep 13

Mostly sunny 87°/70° 💧 0.009 in 💨 6 mph

Monday, Sep 14Mon Sep 14

Mostly sunny 89°/73° 💧 None 💨 9 mph

Tuesday, Sep 15Tue Sep 15

Sunny 84°/76° 💧 0.036 in 💨 9 mph

Wednesday, Sep 16Wed Sep 16

Light rain 77°/68° 💧 0.105 in 💨 10 mph

Thursday, Sep 17Thu Sep 17

Moderate rain 75°/71° 💧 0.685 in 💨 5 mph

Friday, Sep 18Fri Sep 18

Overcast 73°/62° 💧 0.148 in 💨 8 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 73°/57° 💧 None 💨 9 mph

Sunday, Sep 20Sun Sep 20

Mostly sunny 72°/57° 💧 0.004 in 💨 9 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 66°/53° 💧 None 💨 10 mph

Tuesday, Sep 22Tue Sep 22

Overcast 65°/55° 💧 None 💨 10 mph

Wednesday, Sep 23Wed Sep 23

Mostly sunny 66°/49° 💧 None 💨 7 mph

Thursday, Sep 24Thu Sep 24

Overcast 62°/54° 💧 None 💨 6 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in St. Elmo

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for St. Elmo

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 12:00 AM

PM2.5 Fine particles Good 9,2µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 10,0µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Fair 62,1µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 3,2µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in St. Elmo

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 7,7High —Unavailable

Tomorrow UV 2,9Low 🙂Fair

Friday UV 5,2Moderate 🙂Fair

Saturday UV 7,2High 🙂Fair

Sunday UV 5,9Moderate 😐Moderate

Monday UV 9,0Very high —Unavailable

Tuesday UV 7,0High —Unavailable

Today's weather health advice Open today's recommendations.

Strong UV exposure

Protect exposed skin with SPF 30+ sunscreen, wear sunglasses, and try to limit direct midday sun.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

Good conditions for outdoor activities

Outdoor activities can generally be enjoyed normally, with sun protection adjusted to the UV level.

WIND OUTLOOK

Hourly Wind Forecast for St. Elmo

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · ST. ELMO, ILLINOIS

Tonight's Stargazing & Shooting Stars

Good observing conditions. Best local viewing window: 12:00 AM–1:00 AM.

65/100Best-hour score

BEST TIME TONIGHT 12:00 AM–1:00 AM Astronomical darkness: 8:45 PM–5:01 AM

☁ Cloud cover 48% Real hourly forecast for the best viewing hour.

☾ Moonlight 3% New Moon · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 36° high at the best hour.

✦ Estimated visible meteors 0–2/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min47%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

DISCOVER WEATHER NEARBY Weather in other cities

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Forecast data for St. Elmo were last refreshed today at 11:57 PM. The current forecast period extends through 11/09/2026 at 9:00 PM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.