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Current weather in Grafton is scattered clouds.

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

Is the weather forecast for Grafton updated regularly?

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

Now · 2:29 PM

Grafton Weather & Hourly Forecast

United States · Illinois · 62037

87°F

Partly cloudy

Feels like: 89°F

💧 Humidity 49% 🌡 Pressure 30.06 inHg 💨 Wind 6 mph 👁 Visibility 25.1 mi ☁ Clouds 59% ☀️ UV index 7.2 · High 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Grafton

Today

3:00 PM

Mostly cloudy

89° 💧 None 💨 6 mph H 47%30.03 inHg

6:00 PM

Sunny

87° 💧 None 💨 5 mph H 57%30.00 inHg

9:00 PM

Clear night

80° 💧 None 💨 6 mph H 65%30.06 inHg

Tomorrow

12:00 AM

Clear night

79° 💧 None 💨 8 mph H 60%30.03 inHg

3:00 AM

Clear night

76° 💧 None 💨 6 mph H 68%30.03 inHg

6:00 AM

Clear night

76° 💧 None 💨 7 mph H 70%30.03 inHg

9:00 AM

Sunny

82° 💧 None 💨 7 mph H 64%30.03 inHg

12:00 PM

Sunny

90° 💧 0.000 in 💨 5 mph H 54%30.03 inHg

3:00 PM

Strong thunderstorm

93° 💧 0.028 in 💨 4 mph H 51%29.97 inHg

6:00 PM

Light thunderstorms

83° 💧 0.101 in 💨 6 mph H 82%29.97 inHg

9:00 PM

Light rain

77° 💧 0.099 in 💨 3 mph H 96%29.97 inHg

Thursday

12:00 AM

Thunderstorms

74° 💧 0.527 in 💨 4 mph H 98%30.00 inHg

3:00 AM

Light rain

74° 💧 0.245 in 💨 5 mph H 99%29.97 inHg

6:00 AM

Light rain

73° 💧 0.137 in 💨 2 mph H 99%29.97 inHg

9:00 AM

Light rain

73° 💧 0.060 in 💨 3 mph H 97%30.00 inHg

12:00 PM

Overcast

74° 💧 0.002 in 💨 6 mph H 90%30.03 inHg

Today

3:00 PM

Mostly cloudy

89° 💧 None 💨 6 mph H 47%30.03 inHg

4:00 PM

Mostly sunny

89° 💧 None 💨 6 mph H 47%30.03 inHg

5:00 PM

Mostly sunny

89° 💧 None 💨 6 mph H 48%30.00 inHg

6:00 PM

Sunny

87° 💧 None 💨 5 mph H 57%30.00 inHg

7:00 PM

Sunny

83° 💧 None 💨 5 mph H 63%30.03 inHg

8:00 PM

Clear night

81° 💧 None 💨 6 mph H 63%30.03 inHg

9:00 PM

Clear night

80° 💧 None 💨 6 mph H 65%30.06 inHg

10:00 PM

Clear night

79° 💧 None 💨 6 mph H 67%30.06 inHg

11:00 PM

Clear night

78° 💧 None 💨 7 mph H 66%30.06 inHg

Tomorrow

12:00 AM

Clear night

79° 💧 None 💨 8 mph H 60%30.03 inHg

1:00 AM

Clear night

78° 💧 None 💨 8 mph H 60%30.03 inHg

2:00 AM

Clear night

77° 💧 None 💨 6 mph H 65%30.03 inHg

3:00 AM

Clear night

76° 💧 None 💨 6 mph H 68%30.03 inHg

4:00 AM

Clear night

76° 💧 None 💨 6 mph H 70%30.03 inHg

5:00 AM

Clear night

76° 💧 None 💨 7 mph H 70%30.03 inHg

6:00 AM

Clear night

76° 💧 None 💨 7 mph H 70%30.03 inHg

7:00 AM

Sunny

76° 💧 None 💨 7 mph H 71%30.03 inHg

8:00 AM

Sunny

79° 💧 None 💨 7 mph H 69%30.06 inHg

9:00 AM

Sunny

82° 💧 None 💨 7 mph H 64%30.03 inHg

10:00 AM

Sunny

86° 💧 None 💨 7 mph H 58%30.06 inHg

11:00 AM

Sunny

88° 💧 None 💨 6 mph H 56%30.03 inHg

12:00 PM

Sunny

90° 💧 0.000 in 💨 5 mph H 54%30.03 inHg

1:00 PM

Mostly sunny

91° 💧 None 💨 6 mph H 51%30.00 inHg

2:00 PM

Sunny

92° 💧 0.000 in 💨 5 mph H 51%30.00 inHg

3:00 PM

Strong thunderstorm

93° 💧 None 💨 4 mph H 51%29.97 inHg

4:00 PM

Strong thunderstorm

93° 💧 0.001 in 💨 3 mph H 52%29.94 inHg

5:00 PM

Light thunderstorms

87° 💧 0.027 in 💨 6 mph H 66%29.94 inHg

6:00 PM

Light thunderstorms

83° 💧 0.017 in 💨 6 mph H 82%29.97 inHg

7:00 PM

Light thunderstorms

80° 💧 0.030 in 💨 5 mph H 91%29.97 inHg

8:00 PM

Light thunderstorms

76° 💧 0.055 in 💨 4 mph H 97%29.97 inHg

9:00 PM

Light rain

77° 💧 0.046 in 💨 3 mph H 96%29.97 inHg

10:00 PM

Light rain

77° 💧 0.040 in 💨 3 mph H 94%29.97 inHg

11:00 PM

Light rain

76° 💧 0.014 in 💨 3 mph H 93%29.97 inHg

Thursday

12:00 AM

Thunderstorms

74° 💧 0.159 in 💨 4 mph H 98%30.00 inHg

1:00 AM

Thunderstorms

74° 💧 0.111 in 💨 8 mph H 98%30.00 inHg

2:00 AM

Thunderstorms

74° 💧 0.257 in 💨 1 mph H 99%30.00 inHg

3:00 AM

Light rain

74° 💧 0.054 in 💨 5 mph H 99%29.97 inHg

4:00 AM

Thunderstorms

73° 💧 0.100 in 💨 1 mph H 99%30.00 inHg

5:00 AM

Light thunderstorms

73° 💧 0.091 in 💨 3 mph H 99%29.97 inHg

6:00 AM

Light rain

73° 💧 0.039 in 💨 2 mph H 99%29.97 inHg

7:00 AM

Light rain

73° 💧 0.049 in 💨 1 mph H 98%30.00 inHg

8:00 AM

Light rain

73° 💧 0.049 in 💨 3 mph H 98%30.00 inHg

9:00 AM

Light rain

73° 💧 0.023 in 💨 3 mph H 97%30.00 inHg

10:00 AM

Light rain

73° 💧 0.016 in 💨 5 mph H 97%30.00 inHg

11:00 AM

Light rain

73° 💧 0.021 in 💨 6 mph H 96%30.03 inHg

12:00 PM

Overcast

74° 💧 0.002 in 💨 6 mph H 90%30.03 inHg

1:00 PM

Overcast

77° 💧 None 💨 4 mph H 77%30.00 inHg

2:00 PM

Overcast

78° 💧 None 💨 4 mph H 70%29.97 inHg

3:00 PM

Overcast

79° 💧 None 💨 4 mph H 68%29.97 inHg

4:00 PM

Overcast

80° 💧 0.000 in 💨 5 mph H 68%29.94 inHg

5:00 PM

Overcast

80° 💧 0.001 in 💨 7 mph H 68%29.94 inHg

6:00 PM

Overcast

78° 💧 None 💨 5 mph H 76%29.94 inHg

7:00 PM

Overcast

75° 💧 None 💨 5 mph H 81%29.94 inHg

8:00 PM

Mostly clear night

73° 💧 None 💨 6 mph H 84%29.94 inHg

9:00 PM

Clear night

71° 💧 None 💨 5 mph H 85%29.97 inHg

10:00 PM

Clear night

69° 💧 None 💨 5 mph H 86%29.97 inHg

11:00 PM

Mostly clear night

68° 💧 None 💨 5 mph H 87%30.00 inHg

Friday

12:00 AM

Clear night

68° 💧 None 💨 4 mph H 88%29.97 inHg

1:00 AM

Clear night

67° 💧 None 💨 4 mph H 89%29.97 inHg

2:00 AM

Clear night

67° 💧 None 💨 4 mph H 89%29.97 inHg

3:00 AM

Clear night

66° 💧 None 💨 5 mph H 90%29.97 inHg

4:00 AM

Clear night

65° 💧 None 💨 4 mph H 91%29.97 inHg

5:00 AM

Clear night

64° 💧 None 💨 4 mph H 91%29.97 inHg

6:00 AM

Clear night

64° 💧 None 💨 4 mph H 91%29.97 inHg

7:00 AM

Sunny

63° 💧 None 💨 4 mph H 91%29.97 inHg

10:00 AM

Sunny

74° 💧 None 💨 5 mph H 75%29.97 inHg

1:00 PM

Sunny

80° 💧 None 💨 5 mph H 62%29.94 inHg

4:00 PM

Sunny

82° 💧 None 💨 4 mph H 58%29.88 inHg

7:00 PM

Sunny

76° 💧 None 💨 3 mph H 78%29.85 inHg

10:00 PM

Clear night

71° 💧 None 💨 5 mph H 84%29.85 inHg

Saturday

1:00 AM

Partly cloudy night

71° 💧 None 💨 6 mph H 91%29.85 inHg

4:00 AM

Mostly cloudy night

71° 💧 None 💨 7 mph H 94%29.85 inHg

7:00 AM

Mostly cloudy

71° 💧 None 💨 6 mph H 95%29.85 inHg

10:00 AM

Light rain

73° 💧 None 💨 8 mph H 92%29.91 inHg

1:00 PM

Light rain

76° 💧 None 💨 4 mph H 89%29.91 inHg

4:00 PM

Overcast

81° 💧 None 💨 4 mph H 76%29.91 inHg

7:00 PM

Overcast

78° 💧 None 💨 1 mph H 88%29.91 inHg

10:00 PM

Clear night

74° 💧 None 💨 3 mph H 94%29.97 inHg

Sunday

1:00 AM

Clear night

72° 💧 None 💨 2 mph H 97%30.00 inHg

4:00 AM

Partly cloudy night

72° 💧 None 💨 0 mph H 100%30.00 inHg

7:00 AM

Overcast

70° 💧 None 💨 3 mph H 100%30.03 inHg

10:00 AM

Mostly sunny

79° 💧 None 💨 4 mph H 81%30.03 inHg

1:00 PM

Partly cloudy

85° 💧 None 💨 4 mph H 64%30.03 inHg

4:00 PM

Mostly sunny

87° 💧 None 💨 6 mph H 64%29.94 inHg

7:00 PM

Mostly sunny

82° 💧 None 💨 3 mph H 79%29.94 inHg

10:00 PM

Clear night

79° 💧 None 💨 7 mph H 85%29.97 inHg

Monday

1:00 AM

Clear night

79° 💧 None 💨 10 mph H 79%29.94 inHg

7:00 AM

Partly cloudy

74° 💧 None 💨 7 mph H 84%30.03 inHg

1:00 PM

Mostly cloudy

74° 💧 None 💨 7 mph H 93%30.03 inHg

7:00 PM

Overcast

91° 💧 None 💨 8 mph H 55%29.94 inHg

Tuesday

1:00 AM

Clear night

86° 💧 None 💨 7 mph H 64%29.85 inHg

7:00 AM

Overcast

83° 💧 None 💨 10 mph H 64%29.94 inHg

1:00 PM

Sunny

76° 💧 None 💨 6 mph H 84%30.03 inHg

7:00 PM

Mostly cloudy

88° 💧 None 💨 4 mph H 59%30.06 inHg

Wednesday

1:00 AM

Partly cloudy night

81° 💧 None 💨 8 mph H 72%30.09 inHg

7:00 AM

Mostly sunny

74° 💧 None 💨 7 mph H 71%30.18 inHg

1:00 PM

Partly cloudy

71° 💧 None 💨 7 mph H 78%30.21 inHg

7:00 PM

Light rain

83° 💧 None 💨 5 mph H 72%30.18 inHg

Thursday

1:00 AM

Mostly clear night

84° 💧 None 💨 5 mph H 73%30.12 inHg

7:00 AM

Sunny

77° 💧 None 💨 6 mph H 91%30.15 inHg

1:00 PM

Mostly sunny

75° 💧 None 💨 4 mph H 97%30.15 inHg

7:00 PM

Mostly cloudy

81° 💧 None 💨 2 mph H 84%30.15 inHg

Friday

1:00 AM

Overcast night

72° 💧 None 💨 13 mph H 94%30.18 inHg

7:00 AM

Sunny

67° 💧 None 💨 12 mph H 77%30.30 inHg

1:00 PM

Mostly sunny

60° 💧 None 💨 11 mph H 87%30.39 inHg

7:00 PM

Mostly sunny

69° 💧 None 💨 10 mph H 56%30.42 inHg

Saturday

1:00 AM

Clear night

65° 💧 None 💨 9 mph H 62%30.33 inHg

7:00 AM

Sunny

57° 💧 None 💨 5 mph H 76%30.36 inHg

1:00 PM

Sunny

52° 💧 None 💨 6 mph H 85%30.33 inHg

7:00 PM

Sunny

67° 💧 None 💨 6 mph H 49%30.27 inHg

Sunday

1:00 AM

Clear night

63° 💧 None 💨 4 mph H 64%30.12 inHg

7:00 AM

Partly cloudy

58° 💧 None 💨 7 mph H 77%30.12 inHg

1:00 PM

Sunny

54° 💧 None 💨 5 mph H 89%30.12 inHg

7:00 PM

Mostly sunny

75° 💧 None 💨 5 mph H 39%30.09 inHg

Monday

1:00 AM

Clear night

69° 💧 None 💨 5 mph H 59%30.03 inHg

7:00 AM

Sunny

64° 💧 None 💨 5 mph H 73%30.06 inHg

1:00 PM

Overcast

65° 💧 None 💨 5 mph H 62%30.06 inHg

7:00 PM

Partly cloudy

79° 💧 None 💨 6 mph H 46%30.09 inHg

Tuesday

1:00 AM

Overcast night

75° 💧 None 💨 6 mph H 64%30.06 inHg

7:00 AM

Overcast

68° 💧 None 💨 5 mph H 54%30.12 inHg

1:00 PM

Mostly sunny

65° 💧 None 💨 5 mph H 77%30.15 inHg

7:00 PM

Sunny

77° 💧 None 💨 5 mph H 42%30.12 inHg

Wednesday

1:00 AM

Mostly cloudy night

71° 💧 None 💨 5 mph H 57%30.03 inHg

In Grafton and, more broadly, across the state of Illinois: As the afternoon progresses into the evening, the sky remains mostly cloudy, with warm temperatures holding steady between 80 and 89 degrees Fahrenheit. Expect a gentle southeast wind blowing at around 10 mph, with occasional gusts reaching up to 21 mph. No rain is anticipated during this time, so conditions will remain dry and warm through the evening hours. It will likely stay breezy, but comfortable, with moderate winds continuing into the night. Overall, it promises to be a warm and partly cloudy evening without any significant weather concerns.

15-Day Weather Outlook for Grafton

TomorrowTomorrow

Light thunderstorms 94°/76° 💧 None 💨 8 mph

Thursday, Sep 10Thu Sep 10

Light thunderstorms 85°/73° 💧 None 💨 10 mph

Friday, Sep 11Fri Sep 11

Overcast 82°/65° 💧 0.888 in 💨 6 mph

Saturday, Sep 12Sat Sep 12

Light rain 81°/71° 💧 0.127 in 💨 8 mph

Sunday, Sep 13Sun Sep 13

Partly cloudy 87°/70° 💧 0.007 in 💨 6 mph

Monday, Sep 14Mon Sep 14

Mostly sunny 82°/74° 💧 0.001 in 💨 10 mph

Tuesday, Sep 15Tue Sep 15

Overcast 91°/76° 💧 0.007 in 💨 10 mph

Wednesday, Sep 16Wed Sep 16

Mostly cloudy 88°/71° 💧 0.019 in 💨 8 mph

Thursday, Sep 17Thu Sep 17

Light rain 84°/75° 💧 0.044 in 💨 6 mph

Friday, Sep 18Fri Sep 18

Overcast 81°/60° 💧 0.383 in 💨 13 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 69°/52° 💧 0.001 in 💨 10 mph

Sunday, Sep 20Sun Sep 20

Partly cloudy 67°/54° 💧 None 💨 7 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 75°/64° 💧 None 💨 5 mph

Tuesday, Sep 22Tue Sep 22

Partly cloudy 79°/65° 💧 0.002 in 💨 6 mph

Wednesday, Sep 23Wed Sep 23

Mostly cloudy 77°/71° 💧 None 💨 5 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Grafton

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Grafton

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 3:00 PM

PM2.5 Fine particles Good 5,5µg/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 Fair 93,0µg/m³

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

NO₂ Nitrogen dioxide Good 0,2µg/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 Grafton

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 🙂Fair

Tomorrow UV 7,3High 🙂Fair

Thursday UV 4,6Moderate 😊Good

Friday UV 6,5High 🙂Fair

Saturday UV 8,0Very high 🙂Fair

Sunday UV 6,0High —Unavailable

Monday UV 9,0Very high —Unavailable

Hourly UV index today

3:00 PMUV 5,4 4:00 PMUV 3,3 5:00 PMUV 1,6 6:00 PMUV 0,5 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 Grafton

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · GRAFTON, ILLINOIS

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 3:00 AM–4:00 AM.

100/100Best-hour score

BEST TIME TONIGHT 3:00 AM–4:00 AM Astronomical darkness: 8:53 PM–5:06 AM

☁ Cloud cover 0% Real hourly forecast for the best viewing hour.

☾ Moonlight 7% Waning Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 67° high at the best hour.

✦ Estimated visible meteors 2–5/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min79%

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 Grafton were last refreshed today at 2:07 PM. The current forecast period extends through 10/09/2026 at 12:00 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.