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Now · 10:07 AM

St. Elmo Weather & Hourly Forecast

United States · Illinois · 62458

78°F

Mostly sunny

Feels like: 86°F

💧 Humidity 92% 🌡 Pressure 29.97 inHg 💨 Wind 4 mph 👁 Visibility 10.8 mi ☁ Clouds 16% ☀️ UV index 3.6 · Moderate 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for St. Elmo

Today

11:00 AM

Sunny

84° 💧 None 💨 4 mph H 74%29.94 inHg

2:00 PM

Sunny

93° 💧 0.00 in 💨 4 mph H 51%29.91 inHg

5:00 PM

Mostly sunny

92° 💧 None 💨 7 mph H 49%29.85 inHg

8:00 PM

Clear night

83° 💧 None 💨 5 mph H 69%29.85 inHg

11:00 PM

Clear night

81° 💧 None 💨 9 mph H 79%29.91 inHg

Tomorrow

2:00 AM

Clear night

76° 💧 None 💨 8 mph H 87%29.94 inHg

5:00 AM

Clear night

72° 💧 0.00 in 💨 7 mph H 97%29.94 inHg

8:00 AM

Overcast

74° 💧 0.00 in 💨 10 mph H 89%30.00 inHg

11:00 AM

Sunny

81° 💧 None 💨 9 mph H 62%30.03 inHg

2:00 PM

Mostly sunny

86° 💧 None 💨 8 mph H 45%29.97 inHg

5:00 PM

Mostly cloudy

85° 💧 None 💨 9 mph H 44%29.94 inHg

8:00 PM

Clear night

76° 💧 None 💨 9 mph H 50%30.00 inHg

11:00 PM

Mostly clear night

70° 💧 None 💨 9 mph H 57%30.06 inHg

Monday

2:00 AM

Overcast night

67° 💧 None 💨 7 mph H 73%30.06 inHg

5:00 AM

Clear night

65° 💧 None 💨 6 mph H 81%30.09 inHg

8:00 AM

Sunny

67° 💧 None 💨 7 mph H 79%30.12 inHg

Today

11:00 AM

Sunny

84° 💧 None 💨 4 mph H 74%29.94 inHg

12:00 PM

Sunny

89° 💧 None 💨 4 mph H 61%29.94 inHg

1:00 PM

Sunny

91° 💧 None 💨 4 mph H 54%29.91 inHg

2:00 PM

Sunny

93° 💧 None 💨 4 mph H 51%29.91 inHg

3:00 PM

Partly cloudy

94° 💧 0.00 in 💨 7 mph H 47%29.88 inHg

4:00 PM

Mostly sunny

93° 💧 0.00 in 💨 9 mph H 45%29.85 inHg

5:00 PM

Mostly sunny

92° 💧 None 💨 7 mph H 49%29.85 inHg

6:00 PM

Mostly sunny

90° 💧 None 💨 5 mph H 57%29.85 inHg

7:00 PM

Sunny

86° 💧 None 💨 5 mph H 64%29.85 inHg

8:00 PM

Clear night

83° 💧 None 💨 5 mph H 69%29.85 inHg

9:00 PM

Clear night

82° 💧 None 💨 5 mph H 74%29.88 inHg

10:00 PM

Clear night

81° 💧 None 💨 6 mph H 77%29.91 inHg

11:00 PM

Clear night

81° 💧 None 💨 9 mph H 79%29.91 inHg

Tomorrow

12:00 AM

Clear night

80° 💧 None 💨 8 mph H 82%29.94 inHg

1:00 AM

Clear night

78° 💧 None 💨 8 mph H 85%29.94 inHg

2:00 AM

Clear night

76° 💧 None 💨 8 mph H 87%29.94 inHg

3:00 AM

Clear night

74° 💧 None 💨 8 mph H 89%29.94 inHg

4:00 AM

Clear night

73° 💧 None 💨 8 mph H 93%29.94 inHg

5:00 AM

Clear night

72° 💧 None 💨 7 mph H 97%29.94 inHg

6:00 AM

Overcast night

71° 💧 None 💨 7 mph H 98%29.97 inHg

7:00 AM

Overcast

72° 💧 0.00 in 💨 8 mph H 95%30.00 inHg

8:00 AM

Overcast

74° 💧 0.00 in 💨 10 mph H 89%30.00 inHg

9:00 AM

Overcast

75° 💧 0.00 in 💨 9 mph H 84%30.03 inHg

10:00 AM

Sunny

78° 💧 0.00 in 💨 8 mph H 75%30.03 inHg

11:00 AM

Sunny

81° 💧 None 💨 9 mph H 62%30.03 inHg

12:00 PM

Partly cloudy

83° 💧 None 💨 9 mph H 54%30.00 inHg

1:00 PM

Mostly sunny

85° 💧 None 💨 9 mph H 49%30.00 inHg

2:00 PM

Mostly sunny

86° 💧 None 💨 8 mph H 45%29.97 inHg

3:00 PM

Mostly sunny

86° 💧 None 💨 8 mph H 44%29.97 inHg

4:00 PM

Partly cloudy

86° 💧 None 💨 8 mph H 44%29.94 inHg

5:00 PM

Mostly cloudy

85° 💧 None 💨 9 mph H 44%29.94 inHg

6:00 PM

Sunny

83° 💧 None 💨 9 mph H 46%29.97 inHg

7:00 PM

Sunny

79° 💧 None 💨 9 mph H 49%29.97 inHg

8:00 PM

Clear night

76° 💧 None 💨 9 mph H 50%30.00 inHg

9:00 PM

Clear night

74° 💧 None 💨 9 mph H 53%30.03 inHg

10:00 PM

Clear night

73° 💧 None 💨 9 mph H 54%30.03 inHg

11:00 PM

Mostly clear night

70° 💧 None 💨 9 mph H 57%30.06 inHg

Monday

12:00 AM

Mostly cloudy night

69° 💧 None 💨 8 mph H 64%30.06 inHg

1:00 AM

Partly cloudy night

68° 💧 None 💨 8 mph H 68%30.06 inHg

2:00 AM

Overcast night

67° 💧 None 💨 7 mph H 73%30.06 inHg

3:00 AM

Partly cloudy night

66° 💧 None 💨 7 mph H 76%30.06 inHg

4:00 AM

Mostly clear night

66° 💧 None 💨 7 mph H 78%30.06 inHg

5:00 AM

Clear night

65° 💧 None 💨 6 mph H 81%30.09 inHg

6:00 AM

Clear night

64° 💧 None 💨 7 mph H 83%30.09 inHg

7:00 AM

Sunny

64° 💧 None 💨 7 mph H 84%30.12 inHg

8:00 AM

Sunny

67° 💧 None 💨 7 mph H 79%30.12 inHg

9:00 AM

Sunny

71° 💧 None 💨 7 mph H 72%30.12 inHg

10:00 AM

Sunny

75° 💧 None 💨 7 mph H 63%30.12 inHg

11:00 AM

Sunny

78° 💧 None 💨 6 mph H 52%30.12 inHg

12:00 PM

Sunny

80° 💧 None 💨 6 mph H 47%30.12 inHg

1:00 PM

Sunny

82° 💧 None 💨 5 mph H 44%30.09 inHg

2:00 PM

Sunny

83° 💧 None 💨 6 mph H 41%30.09 inHg

3:00 PM

Mostly sunny

84° 💧 None 💨 6 mph H 39%30.06 inHg

4:00 PM

Mostly sunny

84° 💧 None 💨 6 mph H 40%30.06 inHg

5:00 PM

Mostly sunny

84° 💧 None 💨 6 mph H 41%30.03 inHg

6:00 PM

Mostly sunny

82° 💧 None 💨 5 mph H 45%30.03 inHg

7:00 PM

Partly cloudy

78° 💧 None 💨 4 mph H 54%30.06 inHg

Tuesday

4:00 AM

Clear night

67° 💧 None 💨 4 mph H 75%30.06 inHg

7:00 AM

Sunny

66° 💧 None 💨 3 mph H 80%30.09 inHg

10:00 AM

Mostly sunny

81° 💧 None 💨 4 mph H 55%30.12 inHg

1:00 PM

Partly cloudy

89° 💧 None 💨 5 mph H 41%30.09 inHg

4:00 PM

Mostly cloudy

92° 💧 None 💨 5 mph H 36%30.03 inHg

7:00 PM

Partly cloudy

86° 💧 None 💨 2 mph H 49%30.03 inHg

10:00 PM

Clear night

81° 💧 None 💨 8 mph H 54%30.06 inHg

Wednesday

1:00 AM

Mostly cloudy night

78° 💧 None 💨 6 mph H 62%30.06 inHg

4:00 AM

Partly cloudy night

77° 💧 None 💨 8 mph H 68%30.06 inHg

7:00 AM

Mostly sunny

77° 💧 None 💨 9 mph H 73%30.09 inHg

10:00 AM

Sunny

87° 💧 None 💨 11 mph H 58%30.09 inHg

1:00 PM

Mostly sunny

95° 💧 None 💨 11 mph H 39%30.06 inHg

4:00 PM

Sunny

97° 💧 None 💨 9 mph H 32%29.97 inHg

7:00 PM

Sunny

90° 💧 None 💨 7 mph H 42%29.94 inHg

10:00 PM

Mostly clear night

83° 💧 None 💨 6 mph H 52%29.97 inHg

Thursday

1:00 AM

Overcast night

80° 💧 None 💨 4 mph H 62%29.97 inHg

4:00 AM

Partly cloudy night

78° 💧 None 💨 9 mph H 75%29.97 inHg

7:00 AM

Moderate rain

73° 💧 None 💨 6 mph H 96%30.03 inHg

10:00 AM

Moderate rain

73° 💧 None 💨 4 mph H 96%30.03 inHg

1:00 PM

Overcast

79° 💧 None 💨 5 mph H 65%30.00 inHg

4:00 PM

Mostly sunny

83° 💧 None 💨 4 mph H 55%29.91 inHg

7:00 PM

Sunny

78° 💧 None 💨 4 mph H 67%29.91 inHg

10:00 PM

Clear night

71° 💧 None 💨 4 mph H 82%29.94 inHg

Friday

1:00 AM

Clear night

68° 💧 None 💨 2 mph H 88%29.94 inHg

7:00 AM

Sunny

67° 💧 None 💨 5 mph H 77%30.00 inHg

1:00 PM

Sunny

62° 💧 None 💨 4 mph H 76%30.00 inHg

7:00 PM

Mostly sunny

81° 💧 None 💨 5 mph H 35%29.97 inHg

Saturday

1:00 AM

Clear night

74° 💧 None 💨 4 mph H 49%29.88 inHg

7:00 AM

Sunny

67° 💧 None 💨 7 mph H 64%29.91 inHg

1:00 PM

Mostly sunny

66° 💧 None 💨 8 mph H 57%29.88 inHg

7:00 PM

Mostly cloudy

88° 💧 None 💨 11 mph H 31%29.83 inHg

Sunday

1:00 AM

Mostly clear night

88° 💧 None 💨 14 mph H 41%29.68 inHg

7:00 AM

Overcast

74° 💧 None 💨 11 mph H 88%29.77 inHg

1:00 PM

Overcast

67° 💧 None 💨 12 mph H 73%29.91 inHg

7:00 PM

Mostly cloudy

74° 💧 None 💨 8 mph H 45%30.03 inHg

Monday

1:00 AM

Clear night

68° 💧 None 💨 5 mph H 48%30.03 inHg

7:00 AM

Sunny

59° 💧 None 💨 5 mph H 70%30.12 inHg

1:00 PM

Sunny

55° 💧 None 💨 3 mph H 82%30.21 inHg

7:00 PM

Sunny

76° 💧 None 💨 5 mph H 32%30.21 inHg

Tuesday

1:00 AM

Clear night

70° 💧 None 💨 4 mph H 51%30.18 inHg

7:00 AM

Sunny

62° 💧 None 💨 2 mph H 70%30.24 inHg

1:00 PM

Sunny

58° 💧 None 💨 5 mph H 75%30.27 inHg

7:00 PM

Sunny

81° 💧 None 💨 4 mph H 36%30.27 inHg

Wednesday

1:00 AM

Clear night

74° 💧 None 💨 4 mph H 51%30.21 inHg

7:00 AM

Sunny

64° 💧 None 💨 4 mph H 69%30.27 inHg

1:00 PM

Sunny

60° 💧 None 💨 5 mph H 76%30.33 inHg

7:00 PM

Mostly sunny

85° 💧 None 💨 7 mph H 29%30.30 inHg

Thursday

1:00 AM

Mostly clear night

77° 💧 None 💨 4 mph H 45%30.21 inHg

7:00 AM

Mostly sunny

70° 💧 None 💨 6 mph H 49%30.18 inHg

1:00 PM

Mostly cloudy

67° 💧 None 💨 8 mph H 49%30.15 inHg

7:00 PM

Overcast

88° 💧 None 💨 11 mph H 26%30.09 inHg

Friday

1:00 AM

Partly cloudy night

82° 💧 None 💨 5 mph H 39%30.00 inHg

7:00 AM

Sunny

74° 💧 None 💨 5 mph H 63%30.03 inHg

1:00 PM

Sunny

69° 💧 None 💨 8 mph H 84%30.09 inHg

7:00 PM

Mostly clear night

83° 💧 None 💨 9 mph H 46%30.09 inHg

Saturday

1:00 AM

Clear night

78° 💧 None 💨 7 mph H 47%30.06 inHg

7:00 AM

Sunny

67° 💧 None 💨 7 mph H 65%30.12 inHg

1:00 PM

Mostly sunny

60° 💧 None 💨 4 mph H 78%30.12 inHg

7:00 PM

Overcast night

79° 💧 None 💨 6 mph H 36%30.06 inHg

Sunday

1:00 AM

Clear night

72° 💧 None 💨 3 mph H 50%30.00 inHg

In St. Elmo and, more broadly, across the state of Illinois: Clear skies are expected this morning, with temperatures rising quickly into the high 70s to low 80s. It will feel quite warm as the day progresses. In the afternoon, temperatures are forecasted to reach the upper 80s to low 90s, bringing hot conditions. Winds will be coming from the north at up to 14 mph, with gusts reaching 26 mph, providing some relief from the heat. No precipitation is expected throughout the day, so outdoor plans should be straightforward. It’s advisable to stay hydrated and protect yourself from the sun during peak heat hours. The moderate breeze will create some movement, but it may also cause occasional gusts to be stronger. Overall, a warm and sunny day is on the way.

15-Day Weather Outlook for St. Elmo

TomorrowTomorrow

Overcast 86°/71° 💧 None 💨 10 mph

Monday, Sep 7Mon Sep 7

Mostly sunny 84°/64° 💧 None 💨 9 mph

Tuesday, Sep 8Tue Sep 8

Partly cloudy 92°/66° 💧 0.01 in 💨 5 mph

Wednesday, Sep 9Wed Sep 9

Mostly sunny 97°/77° 💧 0.01 in 💨 11 mph

Thursday, Sep 10Thu Sep 10

Moderate rain 90°/73° 💧 0.43 in 💨 9 mph

Friday, Sep 11Fri Sep 11

Sunny 78°/62° 💧 0.06 in 💨 5 mph

Saturday, Sep 12Sat Sep 12

Mostly sunny 81°/66° 💧 0.00 in 💨 8 mph

Sunday, Sep 13Sun Sep 13

Overcast 88°/67° 💧 0.25 in 💨 14 mph

Monday, Sep 14Mon Sep 14

Mostly cloudy 74°/55° 💧 0.00 in 💨 8 mph

Tuesday, Sep 15Tue Sep 15

Sunny 76°/58° 💧 None 💨 5 mph

Wednesday, Sep 16Wed Sep 16

Sunny 81°/60° 💧 0.00 in 💨 5 mph

Thursday, Sep 17Thu Sep 17

Mostly sunny 85°/67° 💧 None 💨 8 mph

Friday, Sep 18Fri Sep 18

Overcast 88°/69° 💧 0.00 in 💨 11 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 83°/60° 💧 None 💨 9 mph

Sunday, Sep 20Sun Sep 20

Overcast 79°/72° 💧 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 11:00 AM

PM2.5 Fine particles Good 5,4µg/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 6,5µg/m³

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

O₃ Ozone Fair 60,1µg/m³

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

NO₂ Nitrogen dioxide Good 2,1µg/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 8,1Very high 🙂Fair

Tomorrow UV 7,8High 🙂Fair

Monday UV 7,9High 😐Moderate

Tuesday UV 7,9High 😐Moderate

Wednesday UV 9,0Very high 🙂Fair

Thursday UV 6,0High —Unavailable

Friday UV 6,0High —Unavailable

Hourly UV index today

11:00 AMUV 5,9 12:00 PMUV 7,6 1:00 PMUV 8,1 2:00 PMUV 7,4 3:00 PMUV 4,4 4:00 PMUV 0,8 5:00 PMUV 0,5 6:00 PMUV 0,2 7:00 PMUV 0,0

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

Very high UV risk

Use SPF 50+ sunscreen, a hat and sunglasses. Seek shade and limit exposure around midday.

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.

Best in the morning or late in the day

For walking, running or cycling, prefer the early morning or late afternoon.

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

Excellent observing conditions. Best local viewing window: 1:00 AM–2:00 AM.

99/100Best-hour score

BEST TIME TONIGHT 1:00 AM–2:00 AM Astronomical darkness: 8:52 PM–4:56 AM

☁ Cloud cover 2% Real hourly forecast for the best viewing hour.

☾ Moonlight 32% Last Quarter · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 44° high at the best hour.

✦ Estimated visible meteors 1–3/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min68%

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

AUG 28–SEP 5

AurigidsStart AUG 28 · Peak SEP 1 · End SEP 5 · ZHR 6 · 80% Moon at peak

ACTIVE NOW

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

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

Explore current conditions and forecasts for other locations.

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Forecast data for St. Elmo were last refreshed today at 10:07 AM. The current forecast period extends through 07/09/2026 at 8:00 AM. 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.