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Current weather in Fairfield is overcast clouds.

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

Now · 5:38 AM

Fairfield Weather & Hourly Forecast

United States · Illinois · 62837

70°F

Overcast night

Feels like: 76°F

💧 Humidity 99% 🌡 Pressure 29.94 inHg 💨 Wind 3 mph 👁 Visibility 7.6 mi ☁ Clouds 100% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Fairfield

Today

6:00 AM

Overcast night

70° 💧 0.000 in 💨 5 mph H 98%29.94 inHg

9:00 AM

Overcast

74° 💧 0.013 in 💨 5 mph H 88%29.97 inHg

12:00 PM

Light rain

80° 💧 0.021 in 💨 4 mph H 70%29.94 inHg

3:00 PM

Light rain

81° 💧 0.028 in 💨 5 mph H 68%29.88 inHg

6:00 PM

Partly cloudy

79° 💧 0.001 in 💨 2 mph H 78%29.85 inHg

9:00 PM

Mostly cloudy night

75° 💧 0.000 in 💨 2 mph H 90%29.88 inHg

Tomorrow

12:00 AM

Partly cloudy night

73° 💧 0.005 in 💨 5 mph H 92%29.85 inHg

3:00 AM

Thunderstorms

71° 💧 0.132 in 💨 6 mph H 97%29.85 inHg

6:00 AM

Light rain

70° 💧 0.007 in 💨 1 mph H 98%29.88 inHg

9:00 AM

Mostly cloudy

75° 💧 0.004 in 💨 4 mph H 89%29.91 inHg

12:00 PM

Mostly cloudy

82° 💧 0.007 in 💨 5 mph H 75%29.91 inHg

3:00 PM

Light rain

84° 💧 0.012 in 💨 5 mph H 68%29.88 inHg

6:00 PM

Mostly sunny

84° 💧 None 💨 3 mph H 69%29.85 inHg

9:00 PM

Clear night

75° 💧 None 💨 3 mph H 78%29.94 inHg

Sunday

12:00 AM

Clear night

73° 💧 None 💨 1 mph H 84%29.94 inHg

3:00 AM

Clear night

70° 💧 None 💨 4 mph H 92%29.97 inHg

Today

6:00 AM

Overcast night

70° 💧 None 💨 5 mph H 98%29.94 inHg

7:00 AM

Overcast

70° 💧 0.000 in 💨 6 mph H 98%29.94 inHg

8:00 AM

Overcast

71° 💧 None 💨 6 mph H 96%29.97 inHg

9:00 AM

Overcast

74° 💧 0.002 in 💨 5 mph H 88%29.97 inHg

10:00 AM

Overcast

76° 💧 0.003 in 💨 5 mph H 81%29.97 inHg

11:00 AM

Light rain

78° 💧 0.008 in 💨 5 mph H 75%29.97 inHg

12:00 PM

Light rain

80° 💧 0.006 in 💨 4 mph H 70%29.94 inHg

1:00 PM

Light rain

81° 💧 0.011 in 💨 4 mph H 67%29.94 inHg

2:00 PM

Overcast

82° 💧 0.004 in 💨 4 mph H 67%29.91 inHg

3:00 PM

Light rain

81° 💧 0.005 in 💨 5 mph H 68%29.88 inHg

4:00 PM

Light rain

78° 💧 0.018 in 💨 5 mph H 79%29.88 inHg

5:00 PM

Light rain

79° 💧 0.005 in 💨 2 mph H 78%29.85 inHg

6:00 PM

Partly cloudy

79° 💧 0.001 in 💨 2 mph H 78%29.85 inHg

7:00 PM

Partly cloudy

77° 💧 None 💨 1 mph H 85%29.85 inHg

8:00 PM

Mostly cloudy night

76° 💧 None 💨 0 mph H 87%29.85 inHg

9:00 PM

Mostly cloudy night

75° 💧 0.000 in 💨 2 mph H 90%29.88 inHg

10:00 PM

Partly cloudy night

74° 💧 None 💨 3 mph H 93%29.88 inHg

11:00 PM

Mostly cloudy night

73° 💧 None 💨 4 mph H 93%29.88 inHg

Tomorrow

12:00 AM

Partly cloudy night

73° 💧 0.000 in 💨 5 mph H 92%29.85 inHg

1:00 AM

Mostly cloudy night

73° 💧 0.002 in 💨 4 mph H 94%29.85 inHg

2:00 AM

Mostly cloudy night

73° 💧 0.003 in 💨 5 mph H 95%29.85 inHg

3:00 AM

Thunderstorms

71° 💧 0.111 in 💨 6 mph H 97%29.85 inHg

4:00 AM

Light thunderstorms

71° 💧 0.020 in 💨 1 mph H 97%29.85 inHg

5:00 AM

Overcast night

71° 💧 0.000 in 💨 0 mph H 97%29.88 inHg

6:00 AM

Light rain

70° 💧 0.005 in 💨 1 mph H 98%29.88 inHg

7:00 AM

Mostly sunny

71° 💧 0.003 in 💨 1 mph H 97%29.88 inHg

8:00 AM

Mostly sunny

73° 💧 None 💨 2 mph H 96%29.91 inHg

9:00 AM

Mostly cloudy

75° 💧 None 💨 4 mph H 89%29.91 inHg

10:00 AM

Mostly sunny

78° 💧 0.003 in 💨 5 mph H 83%29.91 inHg

11:00 AM

Sunny

80° 💧 0.001 in 💨 3 mph H 79%29.91 inHg

12:00 PM

Mostly cloudy

82° 💧 0.001 in 💨 5 mph H 75%29.91 inHg

1:00 PM

Overcast

83° 💧 0.000 in 💨 6 mph H 72%29.91 inHg

2:00 PM

Light rain

82° 💧 0.006 in 💨 5 mph H 73%29.88 inHg

3:00 PM

Light rain

84° 💧 0.009 in 💨 5 mph H 68%29.88 inHg

4:00 PM

Mostly sunny

85° 💧 0.003 in 💨 5 mph H 64%29.85 inHg

5:00 PM

Partly cloudy

85° 💧 None 💨 4 mph H 62%29.85 inHg

6:00 PM

Mostly sunny

84° 💧 None 💨 3 mph H 69%29.85 inHg

7:00 PM

Partly cloudy

79° 💧 None 💨 4 mph H 77%29.88 inHg

8:00 PM

Clear night

77° 💧 None 💨 4 mph H 77%29.91 inHg

9:00 PM

Clear night

75° 💧 None 💨 3 mph H 78%29.94 inHg

10:00 PM

Clear night

75° 💧 None 💨 3 mph H 78%29.94 inHg

11:00 PM

Clear night

74° 💧 None 💨 2 mph H 79%29.94 inHg

Sunday

12:00 AM

Clear night

73° 💧 None 💨 1 mph H 84%29.94 inHg

1:00 AM

Clear night

71° 💧 None 💨 2 mph H 89%29.94 inHg

2:00 AM

Clear night

70° 💧 None 💨 3 mph H 92%29.97 inHg

3:00 AM

Clear night

70° 💧 None 💨 4 mph H 92%29.97 inHg

4:00 AM

Clear night

70° 💧 None 💨 3 mph H 91%29.97 inHg

5:00 AM

Clear night

69° 💧 None 💨 3 mph H 92%29.97 inHg

6:00 AM

Clear night

69° 💧 None 💨 3 mph H 93%30.00 inHg

7:00 AM

Sunny

69° 💧 None 💨 2 mph H 94%30.00 inHg

8:00 AM

Sunny

73° 💧 None 💨 2 mph H 88%30.03 inHg

9:00 AM

Sunny

77° 💧 None 💨 1 mph H 83%30.00 inHg

10:00 AM

Sunny

81° 💧 None 💨 2 mph H 73%30.00 inHg

11:00 AM

Mostly sunny

84° 💧 None 💨 3 mph H 64%30.03 inHg

12:00 PM

Mostly sunny

86° 💧 None 💨 3 mph H 60%30.00 inHg

1:00 PM

Mostly cloudy

87° 💧 None 💨 4 mph H 57%30.00 inHg

2:00 PM

Mostly cloudy

87° 💧 None 💨 4 mph H 56%29.97 inHg

3:00 PM

Mostly cloudy

88° 💧 None 💨 4 mph H 55%29.97 inHg

4:00 PM

Mostly cloudy

88° 💧 None 💨 4 mph H 54%29.94 inHg

5:00 PM

Mostly sunny

88° 💧 None 💨 4 mph H 55%29.94 inHg

6:00 PM

Mostly cloudy

86° 💧 None 💨 2 mph H 63%29.94 inHg

7:00 PM

Mostly cloudy

83° 💧 None 💨 1 mph H 70%29.97 inHg

10:00 PM

Mostly clear night

78° 💧 None 💨 4 mph H 78%30.00 inHg

Monday

1:00 AM

Partly cloudy night

75° 💧 None 💨 4 mph H 83%30.03 inHg

4:00 AM

Partly cloudy night

73° 💧 None 💨 2 mph H 91%30.03 inHg

7:00 AM

Sunny

72° 💧 None 💨 5 mph H 93%30.09 inHg

10:00 AM

Sunny

82° 💧 None 💨 6 mph H 66%30.09 inHg

1:00 PM

Sunny

91° 💧 None 💨 6 mph H 50%30.06 inHg

4:00 PM

Sunny

91° 💧 None 💨 8 mph H 50%30.00 inHg

7:00 PM

Sunny

85° 💧 None 💨 7 mph H 64%30.00 inHg

10:00 PM

Clear night

80° 💧 None 💨 8 mph H 75%30.03 inHg

Tuesday

1:00 AM

Clear night

78° 💧 None 💨 8 mph H 77%30.03 inHg

4:00 AM

Clear night

75° 💧 None 💨 7 mph H 83%30.06 inHg

7:00 AM

Sunny

74° 💧 None 💨 6 mph H 86%30.09 inHg

10:00 AM

Sunny

86° 💧 None 💨 8 mph H 60%30.12 inHg

1:00 PM

Mostly sunny

94° 💧 None 💨 10 mph H 43%30.09 inHg

4:00 PM

Mostly sunny

94° 💧 None 💨 11 mph H 42%30.03 inHg

7:00 PM

Sunny

87° 💧 None 💨 7 mph H 58%30.06 inHg

10:00 PM

Clear night

81° 💧 None 💨 3 mph H 75%30.12 inHg

Wednesday

1:00 AM

Clear night

78° 💧 None 💨 6 mph H 83%30.12 inHg

4:00 AM

Clear night

77° 💧 None 💨 5 mph H 85%30.12 inHg

7:00 AM

Sunny

76° 💧 None 💨 6 mph H 84%30.15 inHg

10:00 AM

Sunny

89° 💧 None 💨 7 mph H 55%30.18 inHg

1:00 PM

Mostly sunny

97° 💧 None 💨 6 mph H 37%30.15 inHg

7:00 PM

Sunny

96° 💧 None 💨 8 mph H 43%30.15 inHg

Thursday

1:00 AM

Mostly clear night

88° 💧 None 💨 5 mph H 59%30.12 inHg

7:00 AM

Sunny

80° 💧 None 💨 5 mph H 80%30.15 inHg

1:00 PM

Sunny

76° 💧 None 💨 6 mph H 89%30.15 inHg

7:00 PM

Mostly clear night

96° 💧 None 💨 12 mph H 39%30.12 inHg

Friday

1:00 AM

Partly cloudy night

78° 💧 None 💨 1 mph H 93%30.12 inHg

7:00 AM

Sunny

75° 💧 None 💨 2 mph H 96%30.15 inHg

1:00 PM

Sunny

74° 💧 None 💨 5 mph H 97%30.15 inHg

7:00 PM

Mostly clear night

89° 💧 None 💨 4 mph H 56%30.12 inHg

Saturday

1:00 AM

Partly cloudy night

83° 💧 None 💨 3 mph H 65%30.06 inHg

7:00 AM

Mostly sunny

73° 💧 None 💨 7 mph H 76%30.03 inHg

1:00 PM

Light rain

71° 💧 None 💨 6 mph H 82%29.97 inHg

7:00 PM

Overcast night

89° 💧 None 💨 11 mph H 59%29.85 inHg

Sunday

1:00 AM

Mostly clear night

82° 💧 None 💨 6 mph H 75%29.74 inHg

7:00 AM

Moderate rain

70° 💧 None 💨 10 mph H 96%29.80 inHg

1:00 PM

Overcast

62° 💧 None 💨 11 mph H 75%29.94 inHg

7:00 PM

Overcast night

73° 💧 None 💨 14 mph H 48%30.00 inHg

Monday

1:00 AM

Mostly clear night

68° 💧 None 💨 10 mph H 59%30.06 inHg

7:00 AM

Sunny

58° 💧 None 💨 12 mph H 66%30.18 inHg

1:00 PM

Sunny

53° 💧 None 💨 8 mph H 84%30.24 inHg

7:00 PM

Clear night

69° 💧 None 💨 9 mph H 46%30.27 inHg

Tuesday

1:00 AM

Mostly cloudy night

64° 💧 None 💨 8 mph H 56%30.24 inHg

7:00 AM

Overcast

57° 💧 None 💨 8 mph H 70%30.30 inHg

1:00 PM

Overcast

55° 💧 None 💨 9 mph H 72%30.33 inHg

7:00 PM

Overcast night

68° 💧 None 💨 11 mph H 43%30.33 inHg

Wednesday

1:00 AM

Overcast night

64° 💧 None 💨 10 mph H 50%30.30 inHg

7:00 AM

Overcast

58° 💧 None 💨 9 mph H 62%30.30 inHg

1:00 PM

Overcast

54° 💧 None 💨 7 mph H 74%30.33 inHg

7:00 PM

Mostly cloudy night

71° 💧 None 💨 7 mph H 43%30.30 inHg

Thursday

1:00 AM

Mostly cloudy night

66° 💧 None 💨 8 mph H 51%30.27 inHg

7:00 AM

Sunny

56° 💧 None 💨 7 mph H 69%30.30 inHg

1:00 PM

Sunny

51° 💧 None 💨 8 mph H 82%30.36 inHg

7:00 PM

Clear night

72° 💧 None 💨 10 mph H 38%30.30 inHg

Friday

1:00 AM

Clear night

66° 💧 None 💨 7 mph H 55%30.27 inHg

7:00 AM

Sunny

58° 💧 None 💨 7 mph H 70%30.27 inHg

1:00 PM

Sunny

52° 💧 None 💨 7 mph H 85%30.30 inHg

In Fairfield and, more broadly, across the state of Illinois: This evening, expect mostly cloudy skies with temperatures remaining mild, around 72 to 74 degrees Fahrenheit. Light east winds will blow at about 5 mph, with gusts reaching up to 6 mph. Rain is very likely during the next few hours, with an expected accumulation of approximately 0.04 inches. Be prepared for the possibility of light showers as the night progresses. Conditions will remain relatively calm in terms of wind, but the potential for rain could affect outdoor plans. Temperatures will stay steady through the evening, making for a generally mild night ahead.

15-Day Weather Outlook for Fairfield

TomorrowTomorrow

Thunderstorms 85°/70° 💧 None 💨 6 mph

Sunday, Sep 13Sun Sep 13

Partly cloudy 88°/69° 💧 None 💨 4 mph

Monday, Sep 14Mon Sep 14

Mostly cloudy 91°/72° 💧 None 💨 8 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 94°/74° 💧 None 💨 11 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 97°/76° 💧 0.000 in 💨 7 mph

Thursday, Sep 17Thu Sep 17

Mostly sunny 96°/76° 💧 0.242 in 💨 8 mph

Friday, Sep 18Fri Sep 18

Mostly sunny 96°/74° 💧 0.210 in 💨 12 mph

Saturday, Sep 19Sat Sep 19

Light rain 89°/71° 💧 0.052 in 💨 7 mph

Sunday, Sep 20Sun Sep 20

Moderate rain 89°/62° 💧 0.479 in 💨 11 mph

Monday, Sep 21Mon Sep 21

Overcast 73°/53° 💧 None 💨 14 mph

Tuesday, Sep 22Tue Sep 22

Mostly cloudy 69°/55° 💧 None 💨 9 mph

Wednesday, Sep 23Wed Sep 23

Overcast 68°/54° 💧 None 💨 11 mph

Thursday, Sep 24Thu Sep 24

Mostly cloudy 71°/51° 💧 None 💨 8 mph

Friday, Sep 25Fri Sep 25

Sunny 72°/52° 💧 None 💨 10 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Fairfield

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Fairfield

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 6:00 AM

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

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

O₃ Ozone Good 20,9µg/m³

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

NO₂ Nitrogen dioxide Good 3,6µg/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 Fairfield

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 4,3Moderate 😊Good

Tomorrow UV 7,6High 🙂Fair

Sunday UV 7,4High 🙂Fair

Monday UV 7,3High 😐Moderate

Tuesday UV 9,0Very high 🙂Fair

Wednesday UV 9,0Very high —Unavailable

Thursday UV 5,0Moderate —Unavailable

Hourly UV index today

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

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

Moderate UV risk

Sunglasses and sun protection are recommended for prolonged exposure.

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 Fairfield

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · FAIRFIELD, ILLINOIS

Tonight's Stargazing & Shooting Stars

Fair observing conditions. Best local viewing window: 10:00 PM–11:00 PM.

62/100Best-hour score

BEST TIME TONIGHT 10:00 PM–11:00 PM Astronomical darkness: 8:38 PM–5:02 AM

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

☾ Moonlight 0% New Moon · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 17° 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 min26%

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 Fairfield were last refreshed today at 2:06 AM. The current forecast period extends through 13/09/2026 at 3:00 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.