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Current weather in Decatur is few clouds.

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This page shows hourly weather forecast for Decatur, including temperature, wind, precipitation, humidity and cloud cover.

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

Now · 7:39 AM

Decatur Weather & Hourly Forecast

United States · Illinois · 62526

79°F

Mostly sunny

Feels like: 80°F

💧 Humidity 66% 🌡 Pressure 30.03 inHg 💨 Wind 8 mph 👁 Visibility 19.9 mi ☁ Clouds 30% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Decatur

Today

8:00 AM

Mostly sunny

79° 💧 0.001 in 💨 8 mph H 66%30.03 inHg

11:00 AM

Mostly sunny

85° 💧 0.000 in 💨 6 mph H 52%30.03 inHg

2:00 PM

Sunny

91° 💧 None 💨 8 mph H 47%29.97 inHg

5:00 PM

Mostly cloudy

90° 💧 0.014 in 💨 9 mph H 49%29.94 inHg

8:00 PM

Mostly clear night

82° 💧 None 💨 4 mph H 73%29.94 inHg

11:00 PM

Thunderstorms

75° 💧 0.317 in 💨 7 mph H 93%30.00 inHg

Tomorrow

2:00 AM

Light thunderstorms

73° 💧 0.333 in 💨 2 mph H 98%29.97 inHg

5:00 AM

Light rain

72° 💧 0.159 in 💨 3 mph H 96%29.97 inHg

8:00 AM

Light rain

72° 💧 0.101 in 💨 5 mph H 98%30.00 inHg

11:00 AM

Overcast

75° 💧 0.000 in 💨 4 mph H 89%30.00 inHg

2:00 PM

Overcast

79° 💧 0.001 in 💨 4 mph H 71%29.97 inHg

5:00 PM

Overcast

79° 💧 None 💨 6 mph H 62%29.91 inHg

8:00 PM

Overcast night

73° 💧 None 💨 6 mph H 77%29.94 inHg

11:00 PM

Clear night

68° 💧 None 💨 6 mph H 72%30.00 inHg

Friday

2:00 AM

Clear night

64° 💧 None 💨 6 mph H 81%30.00 inHg

5:00 AM

Clear night

63° 💧 0.000 in 💨 5 mph H 88%30.00 inHg

Today

8:00 AM

Mostly sunny

79° 💧 None 💨 8 mph H 66%30.03 inHg

9:00 AM

Mostly sunny

81° 💧 None 💨 6 mph H 63%30.06 inHg

10:00 AM

Mostly sunny

82° 💧 0.001 in 💨 5 mph H 58%30.06 inHg

11:00 AM

Mostly sunny

85° 💧 None 💨 6 mph H 52%30.03 inHg

12:00 PM

Sunny

89° 💧 0.000 in 💨 6 mph H 49%30.03 inHg

1:00 PM

Mostly sunny

90° 💧 None 💨 8 mph H 48%30.00 inHg

2:00 PM

Sunny

91° 💧 None 💨 8 mph H 47%29.97 inHg

3:00 PM

Sunny

91° 💧 None 💨 7 mph H 48%29.97 inHg

4:00 PM

Mostly sunny

91° 💧 None 💨 8 mph H 48%29.94 inHg

5:00 PM

Mostly cloudy

90° 💧 None 💨 9 mph H 49%29.94 inHg

6:00 PM

Light rain

86° 💧 0.010 in 💨 9 mph H 61%29.94 inHg

7:00 PM

Light rain

84° 💧 0.004 in 💨 4 mph H 68%29.94 inHg

8:00 PM

Mostly clear night

82° 💧 None 💨 4 mph H 73%29.94 inHg

9:00 PM

Mostly clear night

81° 💧 None 💨 4 mph H 75%29.94 inHg

10:00 PM

Mostly cloudy night

79° 💧 None 💨 4 mph H 76%29.97 inHg

11:00 PM

Thunderstorms

75° 💧 0.116 in 💨 7 mph H 93%30.00 inHg

Tomorrow

12:00 AM

Thunderstorms

74° 💧 0.152 in 💨 1 mph H 97%29.94 inHg

1:00 AM

Light thunderstorms

73° 💧 0.048 in 💨 4 mph H 98%30.00 inHg

2:00 AM

Light thunderstorms

73° 💧 0.021 in 💨 2 mph H 98%29.97 inHg

3:00 AM

Thunderstorms

72° 💧 0.245 in 💨 4 mph H 98%30.00 inHg

4:00 AM

Light rain

72° 💧 0.067 in 💨 2 mph H 96%29.97 inHg

5:00 AM

Light rain

72° 💧 0.054 in 💨 3 mph H 96%29.97 inHg

6:00 AM

Light rain

72° 💧 0.062 in 💨 4 mph H 97%29.97 inHg

7:00 AM

Light rain

72° 💧 0.043 in 💨 3 mph H 98%29.97 inHg

8:00 AM

Light rain

72° 💧 0.024 in 💨 5 mph H 98%30.00 inHg

9:00 AM

Light thunderstorms

72° 💧 0.064 in 💨 3 mph H 97%30.00 inHg

10:00 AM

Light rain

73° 💧 0.013 in 💨 3 mph H 94%30.00 inHg

11:00 AM

Overcast

75° 💧 0.000 in 💨 4 mph H 89%30.00 inHg

12:00 PM

Overcast

76° 💧 0.000 in 💨 2 mph H 81%30.00 inHg

1:00 PM

Overcast

77° 💧 None 💨 3 mph H 78%29.97 inHg

2:00 PM

Overcast

79° 💧 0.001 in 💨 4 mph H 71%29.97 inHg

3:00 PM

Overcast

80° 💧 0.000 in 💨 5 mph H 66%29.94 inHg

4:00 PM

Mostly cloudy

80° 💧 0.000 in 💨 7 mph H 62%29.94 inHg

5:00 PM

Overcast

79° 💧 None 💨 6 mph H 62%29.91 inHg

6:00 PM

Overcast

78° 💧 None 💨 5 mph H 69%29.91 inHg

7:00 PM

Overcast

75° 💧 None 💨 4 mph H 76%29.94 inHg

8:00 PM

Overcast night

73° 💧 None 💨 6 mph H 77%29.94 inHg

9:00 PM

Overcast night

71° 💧 None 💨 7 mph H 73%29.97 inHg

10:00 PM

Mostly cloudy night

70° 💧 None 💨 7 mph H 71%29.97 inHg

11:00 PM

Clear night

68° 💧 None 💨 6 mph H 72%30.00 inHg

Friday

12:00 AM

Clear night

66° 💧 None 💨 5 mph H 77%30.00 inHg

1:00 AM

Clear night

65° 💧 None 💨 5 mph H 79%30.00 inHg

2:00 AM

Clear night

64° 💧 None 💨 6 mph H 81%30.00 inHg

3:00 AM

Clear night

64° 💧 None 💨 6 mph H 84%30.00 inHg

4:00 AM

Clear night

63° 💧 None 💨 5 mph H 87%30.00 inHg

5:00 AM

Clear night

63° 💧 0.000 in 💨 5 mph H 88%30.00 inHg

6:00 AM

Clear night

62° 💧 None 💨 5 mph H 87%30.00 inHg

7:00 AM

Sunny

62° 💧 None 💨 6 mph H 85%30.00 inHg

8:00 AM

Sunny

65° 💧 None 💨 6 mph H 80%30.03 inHg

9:00 AM

Sunny

68° 💧 None 💨 5 mph H 71%30.00 inHg

10:00 AM

Sunny

72° 💧 None 💨 6 mph H 64%30.00 inHg

11:00 AM

Sunny

75° 💧 None 💨 7 mph H 56%30.00 inHg

12:00 PM

Sunny

78° 💧 None 💨 6 mph H 55%29.97 inHg

1:00 PM

Sunny

79° 💧 None 💨 5 mph H 56%29.94 inHg

2:00 PM

Sunny

80° 💧 None 💨 5 mph H 55%29.94 inHg

3:00 PM

Sunny

81° 💧 None 💨 4 mph H 55%29.91 inHg

4:00 PM

Sunny

81° 💧 None 💨 4 mph H 56%29.88 inHg

5:00 PM

Sunny

81° 💧 None 💨 3 mph H 56%29.88 inHg

6:00 PM

Sunny

79° 💧 None 💨 3 mph H 64%29.85 inHg

7:00 PM

Sunny

75° 💧 None 💨 3 mph H 74%29.88 inHg

Saturday

4:00 AM

Clear night

67° 💧 None 💨 4 mph H 94%29.88 inHg

7:00 AM

Sunny

68° 💧 None 💨 5 mph H 98%29.91 inHg

10:00 AM

Overcast

79° 💧 None 💨 10 mph H 80%29.91 inHg

1:00 PM

Mostly sunny

84° 💧 None 💨 8 mph H 64%29.91 inHg

4:00 PM

Mostly cloudy

86° 💧 None 💨 8 mph H 61%29.85 inHg

7:00 PM

Partly cloudy

80° 💧 None 💨 3 mph H 81%29.88 inHg

10:00 PM

Mostly cloudy night

76° 💧 None 💨 1 mph H 88%29.97 inHg

Sunday

1:00 AM

Clear night

73° 💧 None 💨 4 mph H 95%29.97 inHg

4:00 AM

Clear night

71° 💧 None 💨 3 mph H 95%30.00 inHg

7:00 AM

Sunny

70° 💧 None 💨 4 mph H 96%30.03 inHg

10:00 AM

Sunny

79° 💧 None 💨 5 mph H 78%30.06 inHg

1:00 PM

Light rain

85° 💧 None 💨 4 mph H 62%30.03 inHg

4:00 PM

Light rain

87° 💧 None 💨 4 mph H 60%29.97 inHg

7:00 PM

Sunny

81° 💧 None 💨 3 mph H 78%29.94 inHg

10:00 PM

Clear night

77° 💧 None 💨 7 mph H 85%29.97 inHg

Monday

1:00 AM

Clear night

76° 💧 None 💨 9 mph H 84%29.97 inHg

4:00 AM

Mostly clear night

75° 💧 None 💨 9 mph H 85%29.97 inHg

7:00 AM

Sunny

74° 💧 None 💨 9 mph H 89%29.97 inHg

10:00 AM

Mostly sunny

82° 💧 None 💨 9 mph H 69%30.00 inHg

1:00 PM

Mostly sunny

90° 💧 None 💨 10 mph H 49%29.97 inHg

4:00 PM

Sunny

91° 💧 None 💨 10 mph H 44%29.91 inHg

7:00 PM

Sunny

83° 💧 None 💨 7 mph H 59%29.88 inHg

10:00 PM

Clear night

79° 💧 None 💨 9 mph H 66%29.91 inHg

Tuesday

1:00 AM

Clear night

78° 💧 None 💨 11 mph H 76%29.94 inHg

7:00 AM

Sunny

81° 💧 None 💨 11 mph H 74%29.91 inHg

1:00 PM

Overcast

72° 💧 None 💨 5 mph H 96%30.00 inHg

7:00 PM

Overcast

79° 💧 None 💨 9 mph H 68%30.09 inHg

Wednesday

1:00 AM

Partly cloudy night

74° 💧 None 💨 7 mph H 66%30.12 inHg

7:00 AM

Sunny

67° 💧 None 💨 8 mph H 74%30.21 inHg

1:00 PM

Mostly sunny

61° 💧 None 💨 7 mph H 85%30.24 inHg

7:00 PM

Partly cloudy

79° 💧 None 💨 5 mph H 50%30.21 inHg

Thursday

1:00 AM

Mostly cloudy night

76° 💧 None 💨 4 mph H 60%30.15 inHg

7:00 AM

Sunny

69° 💧 None 💨 5 mph H 79%30.18 inHg

1:00 PM

Sunny

66° 💧 None 💨 5 mph H 90%30.18 inHg

7:00 PM

Mostly sunny

86° 💧 None 💨 5 mph H 49%30.12 inHg

Friday

1:00 AM

Mostly clear night

83° 💧 None 💨 4 mph H 57%30.06 inHg

7:00 AM

Sunny

75° 💧 None 💨 3 mph H 76%30.06 inHg

1:00 PM

Light rain

71° 💧 None 💨 6 mph H 94%30.06 inHg

7:00 PM

Mostly sunny

91° 💧 None 💨 2 mph H 45%30.03 inHg

Saturday

1:00 AM

Partly cloudy night

86° 💧 None 💨 2 mph H 59%29.97 inHg

7:00 AM

Sunny

78° 💧 None 💨 7 mph H 78%29.97 inHg

1:00 PM

Sunny

74° 💧 None 💨 6 mph H 90%29.94 inHg

7:00 PM

Clear night

96° 💧 None 💨 12 mph H 40%29.83 inHg

Sunday

1:00 AM

Clear night

90° 💧 None 💨 8 mph H 47%29.74 inHg

7:00 AM

Sunny

84° 💧 None 💨 12 mph H 59%29.74 inHg

1:00 PM

Sunny

76° 💧 None 💨 7 mph H 73%29.80 inHg

7:00 PM

Light rain

84° 💧 None 💨 12 mph H 66%29.83 inHg

Monday

1:00 AM

Overcast night

72° 💧 None 💨 5 mph H 92%29.85 inHg

7:00 AM

Sunny

67° 💧 None 💨 5 mph H 82%29.91 inHg

1:00 PM

Sunny

61° 💧 None 💨 6 mph H 90%29.97 inHg

7:00 PM

Overcast night

76° 💧 None 💨 4 mph H 53%29.97 inHg

Tuesday

1:00 AM

Overcast night

70° 💧 None 💨 6 mph H 77%29.94 inHg

7:00 AM

Light rain

66° 💧 None 💨 15 mph H 90%29.88 inHg

1:00 PM

Light rain

65° 💧 None 💨 5 mph H 96%30.00 inHg

7:00 PM

Overcast night

78° 💧 None 💨 5 mph H 71%30.03 inHg

Wednesday

1:00 AM

Overcast night

76° 💧 None 💨 4 mph H 78%30.03 inHg

7:00 AM

Partly cloudy

71° 💧 None 💨 6 mph H 89%30.06 inHg

1:00 PM

Overcast

69° 💧 None 💨 5 mph H 94%30.09 inHg

7:00 PM

Overcast night

80° 💧 None 💨 3 mph H 70%30.09 inHg

Thursday

1:00 AM

Overcast night

78° 💧 None 💨 2 mph H 80%30.00 inHg

In Decatur and, more broadly, across the state of Illinois: This morning, the sky is mostly sunny with a few clouds scattered across the sky. Temperatures are expected to be mild, ranging from around 69 to 79 degrees Fahrenheit. The wind is light out of the southwest at about 7 mph, with occasional gusts reaching up to 19 mph.

In the afternoon, conditions will remain generally pleasant with continued mostly sunny skies. There is a possibility of some light rain, with an estimated accumulation of around 0.16 inches, and a high likelihood of rain reaching 100%. Winds will stay relatively gentle but may gust occasionally, maintaining a southwest direction. Overall, it should be a warm day with a slight chance of showers in the late afternoon.

15-Day Weather Outlook for Decatur

TomorrowTomorrow

Thunderstorms 84°/72° 💧 None 💨 7 mph

Friday, Sep 11Fri Sep 11

Overcast 81°/62° 💧 None 💨 7 mph

Saturday, Sep 12Sat Sep 12

Overcast 86°/67° 💧 1.251 in 💨 10 mph

Sunday, Sep 13Sun Sep 13

Light rain 87°/70° 💧 0.018 in 💨 5 mph

Monday, Sep 14Mon Sep 14

Mostly sunny 91°/74° 💧 0.005 in 💨 10 mph

Tuesday, Sep 15Tue Sep 15

Overcast 83°/72° 💧 0.025 in 💨 11 mph

Wednesday, Sep 16Wed Sep 16

Overcast 79°/61° 💧 0.005 in 💨 9 mph

Thursday, Sep 17Thu Sep 17

Partly cloudy 79°/66° 💧 None 💨 5 mph

Friday, Sep 18Fri Sep 18

Light rain 86°/71° 💧 0.073 in 💨 6 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 91°/74° 💧 0.002 in 💨 7 mph

Sunday, Sep 20Sun Sep 20

Sunny 96°/76° 💧 0.016 in 💨 12 mph

Monday, Sep 21Mon Sep 21

Light rain 84°/61° 💧 0.654 in 💨 12 mph

Tuesday, Sep 22Tue Sep 22

Light rain 76°/65° 💧 1.813 in 💨 15 mph

Wednesday, Sep 23Wed Sep 23

Overcast 78°/69° 💧 0.028 in 💨 6 mph

Thursday, Sep 24Thu Sep 24

Overcast 80°/78° 💧 0.004 in 💨 3 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Decatur

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Decatur

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 8:00 AM

PM2.5 Fine particles Good 9,4µg/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 10,5µg/m³

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

O₃ Ozone Fair 60,5µg/m³

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

NO₂ Nitrogen dioxide Good 4,9µg/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 Decatur

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 7,6High 🙂Fair

Tomorrow UV 3,5Moderate 😊Good

Friday UV 6,5High 🙂Fair

Saturday UV 6,9High 🙂Fair

Sunday UV 7,0High 😊Good

Monday UV 8,0Very high —Unavailable

Tuesday UV 7,0High —Unavailable

Hourly UV index today

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

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.

Stay hydrated

Drink water regularly, especially during physical activity or prolonged sun exposure.

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 Decatur

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · DECATUR, ILLINOIS

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 9:00 PM–10:00 PM.

83/100Best-hour score

BEST TIME TONIGHT 9:00 PM–10:00 PM Astronomical darkness: 8:47 PM–4:59 AM

☁ Cloud cover 24% Real hourly forecast for the best viewing hour.

☾ Moonlight 4% New Moon · Moon below the horizon at the best viewing hour.

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

✦ Estimated visible meteors 0–1/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min17%

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.

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Forecast data for Decatur were last refreshed today at 7:39 AM. The current forecast period extends through 11/09/2026 at 5:00 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.