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Current weather in Sullivan is broken clouds.

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

Now · 1:31 AM

Sullivan Weather & Hourly Forecast

United States · Illinois · 61951

66°F

Mostly cloudy night

Feels like: 66°F

💧 Humidity 81% 🌡 Pressure 30.09 inHg 💨 Wind 5 mph 👁 Visibility 17.7 mi ☁ Clouds 64% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Sullivan

Today

2:00 AM

Mostly clear night

65° 💧 None 💨 4 mph H 84%30.12 inHg

5:00 AM

Mostly cloudy night

63° 💧 None 💨 4 mph H 90%30.09 inHg

8:00 AM

Overcast

68° 💧 None 💨 3 mph H 79%30.15 inHg

11:00 AM

Partly cloudy

83° 💧 None 💨 6 mph H 51%30.12 inHg

2:00 PM

Mostly sunny

89° 💧 None 💨 4 mph H 38%30.09 inHg

5:00 PM

Overcast

90° 💧 None 💨 4 mph H 35%30.03 inHg

8:00 PM

Clear night

82° 💧 None 💨 6 mph H 51%30.03 inHg

11:00 PM

Clear night

78° 💧 None 💨 5 mph H 58%30.06 inHg

Tomorrow

2:00 AM

Clear night

77° 💧 None 💨 9 mph H 69%30.03 inHg

5:00 AM

Clear night

76° 💧 None 💨 9 mph H 66%30.03 inHg

8:00 AM

Sunny

79° 💧 None 💨 10 mph H 65%30.06 inHg

11:00 AM

Mostly sunny

89° 💧 0.001 in 💨 10 mph H 47%30.06 inHg

2:00 PM

Sunny

94° 💧 0.041 in 💨 8 mph H 42%29.97 inHg

5:00 PM

Light rain

90° 💧 0.019 in 💨 9 mph H 51%29.94 inHg

8:00 PM

Mostly clear night

83° 💧 0.011 in 💨 4 mph H 66%29.94 inHg

11:00 PM

Severe thunderstorms

75° 💧 0.512 in 💨 2 mph H 92%30.00 inHg

Today

2:00 AM

Mostly clear night

65° 💧 None 💨 4 mph H 84%30.12 inHg

3:00 AM

Mostly cloudy night

64° 💧 None 💨 4 mph H 87%30.09 inHg

4:00 AM

Partly cloudy night

63° 💧 None 💨 4 mph H 90%30.09 inHg

5:00 AM

Mostly cloudy night

63° 💧 None 💨 4 mph H 90%30.09 inHg

6:00 AM

Overcast night

63° 💧 None 💨 4 mph H 90%30.09 inHg

7:00 AM

Overcast

63° 💧 None 💨 3 mph H 89%30.12 inHg

8:00 AM

Overcast

68° 💧 None 💨 3 mph H 79%30.15 inHg

9:00 AM

Mostly cloudy

73° 💧 None 💨 4 mph H 69%30.12 inHg

10:00 AM

Partly cloudy

79° 💧 None 💨 5 mph H 59%30.12 inHg

11:00 AM

Partly cloudy

83° 💧 None 💨 6 mph H 51%30.12 inHg

12:00 PM

Mostly sunny

86° 💧 None 💨 6 mph H 45%30.12 inHg

1:00 PM

Partly cloudy

88° 💧 None 💨 5 mph H 41%30.09 inHg

2:00 PM

Mostly sunny

89° 💧 None 💨 4 mph H 38%30.09 inHg

3:00 PM

Mostly cloudy

90° 💧 None 💨 5 mph H 36%30.06 inHg

4:00 PM

Overcast

91° 💧 None 💨 4 mph H 35%30.06 inHg

5:00 PM

Overcast

90° 💧 None 💨 4 mph H 35%30.03 inHg

6:00 PM

Mostly cloudy

89° 💧 None 💨 5 mph H 40%30.03 inHg

7:00 PM

Mostly sunny

84° 💧 None 💨 6 mph H 49%30.03 inHg

8:00 PM

Clear night

82° 💧 None 💨 6 mph H 51%30.03 inHg

9:00 PM

Clear night

80° 💧 None 💨 5 mph H 53%30.06 inHg

10:00 PM

Clear night

79° 💧 None 💨 5 mph H 57%30.09 inHg

11:00 PM

Clear night

78° 💧 None 💨 5 mph H 58%30.06 inHg

Tomorrow

12:00 AM

Clear night

78° 💧 None 💨 8 mph H 59%30.06 inHg

1:00 AM

Clear night

78° 💧 None 💨 9 mph H 67%30.03 inHg

2:00 AM

Clear night

77° 💧 None 💨 9 mph H 69%30.03 inHg

3:00 AM

Clear night

77° 💧 None 💨 8 mph H 66%30.03 inHg

4:00 AM

Clear night

77° 💧 None 💨 9 mph H 65%30.03 inHg

5:00 AM

Clear night

76° 💧 None 💨 9 mph H 66%30.03 inHg

6:00 AM

Clear night

76° 💧 None 💨 10 mph H 67%30.03 inHg

7:00 AM

Sunny

76° 💧 None 💨 10 mph H 68%30.06 inHg

8:00 AM

Sunny

79° 💧 None 💨 10 mph H 65%30.06 inHg

9:00 AM

Sunny

83° 💧 None 💨 10 mph H 59%30.06 inHg

10:00 AM

Mostly sunny

87° 💧 None 💨 11 mph H 51%30.03 inHg

11:00 AM

Mostly sunny

89° 💧 0.001 in 💨 10 mph H 47%30.06 inHg

12:00 PM

Mostly sunny

91° 💧 0.000 in 💨 10 mph H 44%30.03 inHg

1:00 PM

Mostly sunny

92° 💧 None 💨 8 mph H 43%30.00 inHg

2:00 PM

Sunny

94° 💧 None 💨 8 mph H 42%29.97 inHg

3:00 PM

Sunny

95° 💧 None 💨 8 mph H 40%29.94 inHg

4:00 PM

Light thunderstorms

89° 💧 0.041 in 💨 12 mph H 53%29.94 inHg

5:00 PM

Light rain

90° 💧 0.005 in 💨 9 mph H 51%29.94 inHg

6:00 PM

Light thunderstorms

88° 💧 0.013 in 💨 8 mph H 55%29.94 inHg

7:00 PM

Sunny

85° 💧 0.001 in 💨 4 mph H 62%29.94 inHg

8:00 PM

Mostly clear night

83° 💧 None 💨 4 mph H 66%29.94 inHg

9:00 PM

Mostly clear night

82° 💧 None 💨 0 mph H 73%29.94 inHg

10:00 PM

Light thunderstorms

79° 💧 0.011 in 💨 4 mph H 78%29.97 inHg

11:00 PM

Severe thunderstorms

75° 💧 0.308 in 💨 2 mph H 92%30.00 inHg

Thursday

12:00 AM

Light rain

75° 💧 0.038 in 💨 3 mph H 95%30.00 inHg

1:00 AM

Thunderstorms

73° 💧 0.166 in 💨 2 mph H 96%29.97 inHg

2:00 AM

Light rain

73° 💧 0.049 in 💨 6 mph H 98%29.97 inHg

3:00 AM

Light thunderstorms

72° 💧 0.063 in 💨 6 mph H 97%29.97 inHg

4:00 AM

Light thunderstorms

73° 💧 0.088 in 💨 2 mph H 97%29.94 inHg

5:00 AM

Light thunderstorms

72° 💧 0.024 in 💨 4 mph H 98%29.97 inHg

6:00 AM

Thunderstorms

72° 💧 0.100 in 💨 5 mph H 99%29.97 inHg

7:00 AM

Light thunderstorms

72° 💧 0.079 in 💨 5 mph H 98%29.97 inHg

8:00 AM

Light rain

72° 💧 0.037 in 💨 5 mph H 98%29.97 inHg

9:00 AM

Light rain

73° 💧 0.015 in 💨 6 mph H 95%29.97 inHg

10:00 AM

Light rain

73° 💧 0.012 in 💨 6 mph H 95%29.97 inHg

11:00 AM

Light rain

74° 💧 0.012 in 💨 7 mph H 90%29.97 inHg

12:00 PM

Light rain

76° 💧 0.005 in 💨 6 mph H 86%29.97 inHg

1:00 PM

Light rain

78° 💧 0.007 in 💨 5 mph H 80%29.97 inHg

2:00 PM

Overcast

80° 💧 0.002 in 💨 5 mph H 73%29.94 inHg

3:00 PM

Overcast

81° 💧 0.004 in 💨 6 mph H 69%29.91 inHg

4:00 PM

Overcast

81° 💧 0.002 in 💨 7 mph H 63%29.91 inHg

5:00 PM

Mostly cloudy

81° 💧 None 💨 7 mph H 58%29.91 inHg

6:00 PM

Partly cloudy

79° 💧 None 💨 6 mph H 63%29.91 inHg

7:00 PM

Mostly cloudy

75° 💧 None 💨 5 mph H 71%29.91 inHg

10:00 PM

Partly cloudy night

70° 💧 None 💨 7 mph H 80%30.00 inHg

Friday

1:00 AM

Clear night

65° 💧 None 💨 6 mph H 80%30.00 inHg

4:00 AM

Clear night

62° 💧 None 💨 6 mph H 87%30.00 inHg

7:00 AM

Sunny

62° 💧 None 💨 6 mph H 89%30.03 inHg

10:00 AM

Sunny

72° 💧 None 💨 6 mph H 68%30.03 inHg

1:00 PM

Sunny

79° 💧 None 💨 5 mph H 59%29.97 inHg

4:00 PM

Sunny

81° 💧 None 💨 4 mph H 56%29.91 inHg

7:00 PM

Mostly sunny

75° 💧 None 💨 4 mph H 73%29.88 inHg

10:00 PM

Clear night

71° 💧 None 💨 7 mph H 79%29.91 inHg

Saturday

1:00 AM

Clear night

69° 💧 None 💨 7 mph H 85%29.91 inHg

4:00 AM

Clear night

68° 💧 None 💨 6 mph H 88%29.91 inHg

7:00 AM

Sunny

67° 💧 None 💨 5 mph H 91%29.94 inHg

10:00 AM

Light rain

78° 💧 None 💨 7 mph H 78%29.94 inHg

1:00 PM

Mostly sunny

85° 💧 None 💨 7 mph H 64%29.94 inHg

4:00 PM

Mostly sunny

86° 💧 None 💨 8 mph H 60%29.88 inHg

7:00 PM

Sunny

80° 💧 None 💨 4 mph H 76%29.91 inHg

10:00 PM

Light rain

74° 💧 None 💨 4 mph H 93%30.00 inHg

Sunday

1:00 AM

Partly cloudy night

72° 💧 None 💨 4 mph H 97%30.00 inHg

4:00 AM

Mostly cloudy night

71° 💧 None 💨 4 mph H 99%30.00 inHg

7:00 AM

Overcast

71° 💧 None 💨 5 mph H 99%30.03 inHg

10:00 AM

Overcast

81° 💧 None 💨 4 mph H 76%30.06 inHg

1:00 PM

Mostly sunny

85° 💧 None 💨 5 mph H 68%30.03 inHg

7:00 PM

Mostly sunny

87° 💧 None 💨 8 mph H 60%30.03 inHg

Monday

1:00 AM

Mostly clear night

82° 💧 None 💨 4 mph H 72%29.97 inHg

7:00 AM

Sunny

76° 💧 None 💨 6 mph H 90%30.00 inHg

1:00 PM

Mostly sunny

74° 💧 None 💨 6 mph H 95%30.03 inHg

7:00 PM

Light rain

89° 💧 None 💨 11 mph H 54%29.97 inHg

Tuesday

1:00 AM

Clear night

85° 💧 None 💨 9 mph H 60%29.85 inHg

7:00 AM

Mostly sunny

79° 💧 None 💨 11 mph H 81%29.94 inHg

1:00 PM

Mostly cloudy

73° 💧 None 💨 7 mph H 96%30.00 inHg

7:00 PM

Sunny

80° 💧 None 💨 10 mph H 44%30.09 inHg

Wednesday

1:00 AM

Mostly clear night

72° 💧 None 💨 6 mph H 54%30.12 inHg

7:00 AM

Sunny

63° 💧 None 💨 7 mph H 72%30.24 inHg

1:00 PM

Sunny

59° 💧 None 💨 6 mph H 87%30.33 inHg

7:00 PM

Sunny

76° 💧 None 💨 8 mph H 49%30.33 inHg

Thursday

1:00 AM

Clear night

72° 💧 None 💨 5 mph H 57%30.27 inHg

7:00 AM

Sunny

61° 💧 None 💨 5 mph H 77%30.33 inHg

1:00 PM

Sunny

58° 💧 None 💨 6 mph H 84%30.36 inHg

7:00 PM

Sunny

77° 💧 None 💨 8 mph H 40%30.33 inHg

Friday

1:00 AM

Mostly clear night

71° 💧 None 💨 4 mph H 52%30.21 inHg

7:00 AM

Overcast

63° 💧 None 💨 6 mph H 72%30.18 inHg

1:00 PM

Overcast

60° 💧 None 💨 5 mph H 84%30.15 inHg

7:00 PM

Overcast night

76° 💧 None 💨 3 mph H 46%30.12 inHg

Saturday

1:00 AM

Partly cloudy night

73° 💧 None 💨 3 mph H 58%30.03 inHg

7:00 AM

Moderate rain

66° 💧 None 💨 1 mph H 74%30.03 inHg

1:00 PM

Moderate rain

64° 💧 None 💨 5 mph H 93%30.03 inHg

7:00 PM

Light rain

67° 💧 None 💨 8 mph H 94%30.03 inHg

Sunday

1:00 AM

Overcast night

67° 💧 None 💨 6 mph H 96%29.97 inHg

7:00 AM

Partly cloudy

63° 💧 None 💨 4 mph H 96%29.97 inHg

1:00 PM

Mostly cloudy

60° 💧 None 💨 7 mph H 85%30.00 inHg

7:00 PM

Clear night

76° 💧 None 💨 7 mph H 60%30.00 inHg

Monday

1:00 AM

Mostly clear night

71° 💧 None 💨 4 mph H 72%30.00 inHg

7:00 AM

Partly cloudy

63° 💧 None 💨 7 mph H 67%30.03 inHg

1:00 PM

Mostly cloudy

59° 💧 None 💨 6 mph H 74%30.09 inHg

7:00 PM

Moderate rain

71° 💧 None 💨 7 mph H 76%30.03 inHg

Tuesday

1:00 AM

Very heavy rain

67° 💧 None 💨 9 mph H 94%29.94 inHg

7:00 AM

Heavy rain

67° 💧 None 💨 5 mph H 94%29.85 inHg

1:00 PM

Overcast

67° 💧 None 💨 7 mph H 96%29.85 inHg

In Sullivan and, more broadly, across the state of Illinois: This evening will be mostly sunny with a few clouds, and temperatures will remain mild to warm, ranging from 76 to 79 degrees Fahrenheit. Light east winds will prevail, with speeds up to 9 mph and occasional gusts reaching 22 mph. No precipitation is expected during this time, making for a clear and pleasant evening. Conditions should remain stable through the next few hours, providing comfortable weather for outdoor activities. Temperatures will gradually stay within the same range, and winds are unlikely to cause any disruptions. Overall, it should be a calm and mild evening with clear skies and gentle breezes.

15-Day Weather Outlook for Sullivan

TomorrowTomorrow

Light thunderstorms 90°/74° 💧 None 💨 12 mph

Thursday, Sep 10Thu Sep 10

Light thunderstorms 83°/71° 💧 0.957 in 💨 9 mph

Friday, Sep 11Fri Sep 11

Overcast 81°/62° 💧 None 💨 7 mph

Saturday, Sep 12Sat Sep 12

Light rain 86°/67° 💧 0.029 in 💨 8 mph

Sunday, Sep 13Sun Sep 13

Light rain 85°/71° 💧 0.040 in 💨 5 mph

Monday, Sep 14Mon Sep 14

Mostly sunny 87°/74° 💧 0.065 in 💨 8 mph

Tuesday, Sep 15Tue Sep 15

Light rain 89°/73° 💧 0.123 in 💨 11 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 80°/59° 💧 0.008 in 💨 10 mph

Thursday, Sep 17Thu Sep 17

Sunny 76°/58° 💧 None 💨 8 mph

Friday, Sep 18Fri Sep 18

Mostly sunny 77°/60° 💧 None 💨 8 mph

Saturday, Sep 19Sat Sep 19

Moderate rain 76°/64° 💧 0.255 in 💨 5 mph

Sunday, Sep 20Sun Sep 20

Light rain 67°/60° 💧 1.179 in 💨 8 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 76°/59° 💧 None 💨 7 mph

Tuesday, Sep 22Tue Sep 22

Very heavy rain 71°/67° 💧 5.558 in 💨 9 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Sullivan

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Sullivan

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 2:00 AM

PM2.5 Fine particles Good 5,7µg/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 6,1µg/m³

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

O₃ Ozone Good 58,4µg/m³

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

NO₂ Nitrogen dioxide Good 3,3µg/m³

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

Air quality is favorable for outdoor activities.

UV & HEALTH

UV, Sun & Health Outlook in Sullivan

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 7,8High 😊Good

Tomorrow UV 7,8High 😐Moderate

Thursday UV 4,7Moderate 😊Good

Friday UV 6,6High 🙂Fair

Saturday UV 6,0High 😊Good

Sunday UV 8,0Very high —Unavailable

Monday UV 7,0High —Unavailable

Hourly UV index today

7:00 AMUV 0,0 8:00 AMUV 0,6 9:00 AMUV 1,8 10:00 AMUV 3,7 11:00 AMUV 5,7 12:00 PMUV 7,3 1:00 PMUV 7,8 2:00 PMUV 7,1 3:00 PMUV 5,3 4:00 PMUV 3,3 5:00 PMUV 1,5 6:00 PMUV 0,5

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.

Good air quality

Air quality is good and outdoor activities can be enjoyed normally.

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 Sullivan

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · SULLIVAN, ILLINOIS

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 2:00 AM–3:00 AM.

86/100Best-hour score

BEST TIME TONIGHT 2:00 AM–3:00 AM Astronomical darkness: 8:49 PM–4:56 AM

☁ Cloud cover 20% Real hourly forecast for the best viewing hour.

☾ Moonlight 14% Waning Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 56° high at the best hour.

✦ Estimated visible meteors 1–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min70%

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 Sullivan were last refreshed today at 1:15 AM. The current forecast period extends through 09/09/2026 at 11:00 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.