What is the weather in Alton right now?

Current weather in Alton is overcast clouds.

Where can I find the hourly weather forecast for Alton?

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

Is the weather forecast for Alton updated regularly?

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

Now · 4:28 AM

Alton Weather & Hourly Forecast

United States · Illinois · 62002

70°F

Overcast night

Feels like: 68°F

💧 Humidity 66% 🌡 Pressure 30.06 inHg 💨 Wind 7 mph 👁 Visibility 19.7 mi ☁ Clouds 100% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Alton

Today

5:00 AM

Mostly cloudy night

69° 💧 None 💨 7 mph H 72%30.03 inHg

8:00 AM

Sunny

69° 💧 None 💨 6 mph H 75%30.09 inHg

11:00 AM

Sunny

78° 💧 None 💨 8 mph H 54%30.09 inHg

2:00 PM

Sunny

84° 💧 None 💨 5 mph H 42%30.06 inHg

5:00 PM

Mostly sunny

85° 💧 None 💨 6 mph H 40%30.00 inHg

8:00 PM

Clear night

77° 💧 None 💨 7 mph H 56%30.03 inHg

11:00 PM

Clear night

72° 💧 None 💨 5 mph H 61%30.06 inHg

Tomorrow

2:00 AM

Mostly clear night

69° 💧 None 💨 5 mph H 72%30.06 inHg

5:00 AM

Mostly cloudy night

67° 💧 None 💨 3 mph H 81%30.09 inHg

8:00 AM

Overcast

69° 💧 None 💨 4 mph H 79%30.09 inHg

11:00 AM

Mostly cloudy

82° 💧 None 💨 4 mph H 51%30.09 inHg

2:00 PM

Partly cloudy

89° 💧 None 💨 3 mph H 39%30.03 inHg

5:00 PM

Sunny

91° 💧 None 💨 4 mph H 36%30.00 inHg

8:00 PM

Clear night

83° 💧 None 💨 5 mph H 51%30.00 inHg

11:00 PM

Mostly clear night

79° 💧 None 💨 6 mph H 54%30.03 inHg

Wednesday

2:00 AM

Clear night

78° 💧 None 💨 7 mph H 67%30.03 inHg

Today

5:00 AM

Mostly cloudy night

69° 💧 None 💨 7 mph H 72%30.03 inHg

6:00 AM

Mostly clear night

68° 💧 None 💨 5 mph H 78%30.06 inHg

7:00 AM

Mostly sunny

67° 💧 None 💨 5 mph H 81%30.09 inHg

8:00 AM

Sunny

69° 💧 None 💨 6 mph H 75%30.09 inHg

9:00 AM

Sunny

72° 💧 None 💨 7 mph H 68%30.09 inHg

10:00 AM

Sunny

75° 💧 None 💨 7 mph H 61%30.09 inHg

11:00 AM

Sunny

78° 💧 None 💨 8 mph H 54%30.09 inHg

12:00 PM

Sunny

81° 💧 None 💨 6 mph H 49%30.09 inHg

1:00 PM

Sunny

83° 💧 None 💨 5 mph H 45%30.06 inHg

2:00 PM

Sunny

84° 💧 None 💨 5 mph H 42%30.06 inHg

3:00 PM

Sunny

85° 💧 None 💨 5 mph H 40%30.03 inHg

4:00 PM

Sunny

85° 💧 None 💨 5 mph H 39%30.03 inHg

5:00 PM

Mostly sunny

85° 💧 None 💨 6 mph H 40%30.00 inHg

6:00 PM

Mostly sunny

83° 💧 None 💨 6 mph H 45%30.00 inHg

7:00 PM

Sunny

79° 💧 None 💨 6 mph H 52%30.03 inHg

8:00 PM

Clear night

77° 💧 None 💨 7 mph H 56%30.03 inHg

9:00 PM

Clear night

75° 💧 None 💨 6 mph H 59%30.06 inHg

10:00 PM

Clear night

74° 💧 None 💨 6 mph H 58%30.06 inHg

11:00 PM

Clear night

72° 💧 None 💨 5 mph H 61%30.06 inHg

Tomorrow

12:00 AM

Clear night

72° 💧 None 💨 6 mph H 64%30.06 inHg

1:00 AM

Clear night

70° 💧 None 💨 5 mph H 68%30.06 inHg

2:00 AM

Mostly clear night

69° 💧 None 💨 5 mph H 72%30.06 inHg

3:00 AM

Mostly cloudy night

69° 💧 None 💨 5 mph H 75%30.06 inHg

4:00 AM

Mostly cloudy night

68° 💧 None 💨 4 mph H 78%30.06 inHg

5:00 AM

Mostly cloudy night

67° 💧 None 💨 3 mph H 81%30.09 inHg

6:00 AM

Overcast night

67° 💧 None 💨 3 mph H 84%30.09 inHg

7:00 AM

Overcast

67° 💧 None 💨 3 mph H 85%30.09 inHg

8:00 AM

Overcast

69° 💧 None 💨 4 mph H 79%30.09 inHg

9:00 AM

Mostly cloudy

73° 💧 None 💨 4 mph H 70%30.09 inHg

10:00 AM

Mostly cloudy

77° 💧 None 💨 4 mph H 60%30.09 inHg

11:00 AM

Mostly cloudy

82° 💧 None 💨 4 mph H 51%30.09 inHg

12:00 PM

Partly cloudy

85° 💧 None 💨 4 mph H 46%30.09 inHg

1:00 PM

Mostly sunny

87° 💧 None 💨 4 mph H 42%30.06 inHg

2:00 PM

Partly cloudy

89° 💧 None 💨 3 mph H 39%30.03 inHg

3:00 PM

Partly cloudy

90° 💧 None 💨 3 mph H 37%30.03 inHg

4:00 PM

Sunny

91° 💧 None 💨 4 mph H 36%30.00 inHg

5:00 PM

Sunny

91° 💧 None 💨 4 mph H 36%30.00 inHg

6:00 PM

Sunny

89° 💧 None 💨 4 mph H 42%30.00 inHg

7:00 PM

Mostly sunny

85° 💧 None 💨 4 mph H 48%30.00 inHg

8:00 PM

Clear night

83° 💧 None 💨 5 mph H 51%30.00 inHg

9:00 PM

Clear night

81° 💧 None 💨 4 mph H 53%30.03 inHg

10:00 PM

Mostly clear night

79° 💧 None 💨 5 mph H 54%30.03 inHg

11:00 PM

Mostly clear night

79° 💧 None 💨 6 mph H 54%30.03 inHg

Wednesday

12:00 AM

Clear night

79° 💧 None 💨 8 mph H 59%30.03 inHg

1:00 AM

Clear night

79° 💧 None 💨 7 mph H 65%30.03 inHg

2:00 AM

Clear night

78° 💧 None 💨 7 mph H 67%30.03 inHg

3:00 AM

Clear night

77° 💧 None 💨 7 mph H 69%30.03 inHg

4:00 AM

Clear night

76° 💧 None 💨 5 mph H 71%30.03 inHg

5:00 AM

Clear night

76° 💧 None 💨 5 mph H 73%30.03 inHg

6:00 AM

Clear night

75° 💧 None 💨 5 mph H 74%30.03 inHg

7:00 AM

Sunny

75° 💧 None 💨 5 mph H 73%30.06 inHg

8:00 AM

Sunny

79° 💧 None 💨 6 mph H 67%30.06 inHg

9:00 AM

Sunny

83° 💧 None 💨 5 mph H 59%30.03 inHg

10:00 AM

Sunny

87° 💧 None 💨 6 mph H 51%30.03 inHg

11:00 AM

Sunny

91° 💧 None 💨 7 mph H 45%30.03 inHg

12:00 PM

Partly cloudy

93° 💧 None 💨 7 mph H 43%30.03 inHg

1:00 PM

Light rain

92° 💧 0.006 in 💨 7 mph H 48%30.00 inHg

2:00 PM

Light rain

94° 💧 0.008 in 💨 7 mph H 46%29.97 inHg

3:00 PM

Light rain

92° 💧 0.004 in 💨 8 mph H 48%29.97 inHg

4:00 PM

Light rain

92° 💧 0.005 in 💨 6 mph H 49%29.97 inHg

5:00 PM

Light thunderstorms

86° 💧 0.055 in 💨 2 mph H 74%29.94 inHg

6:00 PM

Light rain

85° 💧 0.007 in 💨 3 mph H 80%29.97 inHg

7:00 PM

Mostly sunny

83° 💧 0.000 in 💨 2 mph H 87%29.94 inHg

10:00 PM

Mostly clear night

79° 💧 None 💨 1 mph H 92%29.97 inHg

Thursday

1:00 AM

Light rain

74° 💧 None 💨 2 mph H 99%30.00 inHg

4:00 AM

Light thunderstorms

73° 💧 None 💨 5 mph H 99%30.00 inHg

7:00 AM

Overcast

72° 💧 None 💨 3 mph H 98%30.00 inHg

10:00 AM

Overcast

75° 💧 None 💨 5 mph H 91%30.03 inHg

1:00 PM

Overcast

81° 💧 None 💨 6 mph H 71%30.00 inHg

4:00 PM

Partly cloudy

83° 💧 None 💨 6 mph H 59%29.94 inHg

7:00 PM

Partly cloudy

77° 💧 None 💨 5 mph H 74%29.94 inHg

10:00 PM

Overcast night

70° 💧 None 💨 4 mph H 81%29.97 inHg

Friday

1:00 AM

Mostly cloudy night

68° 💧 None 💨 5 mph H 83%30.00 inHg

4:00 AM

Mostly cloudy night

65° 💧 None 💨 5 mph H 82%29.97 inHg

7:00 AM

Mostly cloudy

64° 💧 None 💨 6 mph H 80%30.00 inHg

10:00 AM

Overcast

74° 💧 None 💨 5 mph H 68%30.00 inHg

1:00 PM

Overcast

81° 💧 None 💨 6 mph H 63%29.94 inHg

4:00 PM

Mostly cloudy

83° 💧 None 💨 5 mph H 57%29.85 inHg

7:00 PM

Partly cloudy

78° 💧 None 💨 2 mph H 76%29.83 inHg

10:00 PM

Clear night

74° 💧 None 💨 8 mph H 77%29.85 inHg

Saturday

1:00 AM

Clear night

73° 💧 None 💨 6 mph H 84%29.85 inHg

4:00 AM

Partly cloudy night

73° 💧 None 💨 7 mph H 88%29.83 inHg

7:00 AM

Light rain

71° 💧 None 💨 6 mph H 98%29.85 inHg

10:00 AM

Moderate rain

73° 💧 None 💨 8 mph H 96%29.91 inHg

1:00 PM

Overcast

80° 💧 None 💨 6 mph H 78%29.91 inHg

4:00 PM

Mostly cloudy

83° 💧 None 💨 5 mph H 70%29.91 inHg

7:00 PM

Overcast

81° 💧 None 💨 1 mph H 82%29.91 inHg

Sunday

1:00 AM

Mostly clear night

75° 💧 None 💨 2 mph H 93%30.00 inHg

7:00 AM

Partly cloudy

73° 💧 None 💨 1 mph H 97%30.06 inHg

1:00 PM

Mostly sunny

86° 💧 None 💨 5 mph H 68%30.06 inHg

7:00 PM

Overcast

82° 💧 None 💨 1 mph H 79%30.00 inHg

Monday

1:00 AM

Mostly cloudy night

76° 💧 None 💨 5 mph H 89%30.03 inHg

7:00 AM

Partly cloudy

74° 💧 None 💨 6 mph H 91%30.00 inHg

1:00 PM

Mostly sunny

90° 💧 None 💨 10 mph H 60%29.94 inHg

7:00 PM

Sunny

85° 💧 None 💨 10 mph H 69%29.85 inHg

Tuesday

1:00 AM

Clear night

81° 💧 None 💨 10 mph H 74%29.91 inHg

7:00 AM

Sunny

70° 💧 None 💨 10 mph H 84%30.06 inHg

1:00 PM

Mostly cloudy

77° 💧 None 💨 8 mph H 52%30.12 inHg

7:00 PM

Sunny

72° 💧 None 💨 6 mph H 64%30.15 inHg

Wednesday

1:00 AM

Partly cloudy night

64° 💧 None 💨 7 mph H 75%30.24 inHg

7:00 AM

Sunny

60° 💧 None 💨 7 mph H 84%30.33 inHg

1:00 PM

Sunny

73° 💧 None 💨 8 mph H 51%30.36 inHg

7:00 PM

Sunny

68° 💧 None 💨 7 mph H 58%30.30 inHg

Thursday

1:00 AM

Partly cloudy night

61° 💧 None 💨 7 mph H 72%30.39 inHg

7:00 AM

Mostly cloudy

57° 💧 None 💨 4 mph H 84%30.36 inHg

1:00 PM

Partly cloudy

72° 💧 None 💨 6 mph H 51%30.36 inHg

7:00 PM

Overcast

68° 💧 None 💨 7 mph H 65%30.30 inHg

Friday

1:00 AM

Partly cloudy night

60° 💧 None 💨 6 mph H 77%30.33 inHg

7:00 AM

Sunny

53° 💧 None 💨 4 mph H 90%30.33 inHg

1:00 PM

Mostly cloudy

71° 💧 None 💨 3 mph H 47%30.30 inHg

7:00 PM

Partly cloudy

67° 💧 None 💨 4 mph H 61%30.18 inHg

Saturday

1:00 AM

Mostly clear night

60° 💧 None 💨 5 mph H 76%30.21 inHg

7:00 AM

Overcast

57° 💧 None 💨 3 mph H 87%30.18 inHg

1:00 PM

Partly cloudy

75° 💧 None 💨 3 mph H 51%30.18 inHg

7:00 PM

Sunny

69° 💧 None 💨 2 mph H 71%30.09 inHg

Sunday

1:00 AM

Clear night

63° 💧 None 💨 2 mph H 79%30.09 inHg

7:00 AM

Sunny

58° 💧 None 💨 1 mph H 87%30.06 inHg

1:00 PM

Overcast

79° 💧 None 💨 6 mph H 43%30.03 inHg

7:00 PM

Overcast

72° 💧 None 💨 3 mph H 58%29.94 inHg

Monday

1:00 AM

Overcast night

66° 💧 None 💨 5 mph H 77%30.00 inHg

7:00 AM

Moderate rain

64° 💧 None 💨 3 mph H 98%30.00 inHg

1:00 PM

Overcast

71° 💧 None 💨 7 mph H 82%30.00 inHg

7:00 PM

Overcast

68° 💧 None 💨 3 mph H 89%29.94 inHg

In Alton and, more broadly, across the state of Illinois: The evening will feature a mix of sun and clouds, with temperatures remaining mild to warm, ranging from 76 to 78 degrees Fahrenheit. Winds will be light and coming from the east, with speeds up to 8 mph, occasionally gusting to 18 mph. No precipitation is expected during this time, making for a relatively calm and pleasant evening. The weather should remain stable through the next few hours, with comfortable conditions and no significant weather disturbances anticipated. Overall, it’s a good evening for outdoor activities or relaxing outside. Temperatures will gradually stay steady, and the breeze will provide a gentle refreshment as the night progresses.

15-Day Weather Outlook for Alton

TomorrowTomorrow

Mostly sunny 91°/67° 💧 None 💨 7 mph

Wednesday, Sep 9Wed Sep 9

Light thunderstorms 94°/75° 💧 None 💨 8 mph

Thursday, Sep 10Thu Sep 10

Light thunderstorms 83°/72° 💧 0.541 in 💨 6 mph

Friday, Sep 11Fri Sep 11

Partly cloudy 83°/64° 💧 None 💨 6 mph

Saturday, Sep 12Sat Sep 12

Moderate rain 83°/71° 💧 0.503 in 💨 8 mph

Sunday, Sep 13Sun Sep 13

Mostly sunny 86°/73° 💧 0.055 in 💨 5 mph

Monday, Sep 14Mon Sep 14

Mostly sunny 90°/74° 💧 0.006 in 💨 10 mph

Tuesday, Sep 15Tue Sep 15

Mostly cloudy 85°/70° 💧 0.025 in 💨 10 mph

Wednesday, Sep 16Wed Sep 16

Partly cloudy 73°/60° 💧 None 💨 8 mph

Thursday, Sep 17Thu Sep 17

Partly cloudy 72°/57° 💧 None 💨 7 mph

Friday, Sep 18Fri Sep 18

Overcast 71°/53° 💧 0.002 in 💨 7 mph

Saturday, Sep 19Sat Sep 19

Partly cloudy 75°/57° 💧 None 💨 5 mph

Sunday, Sep 20Sun Sep 20

Overcast 79°/58° 💧 None 💨 6 mph

Monday, Sep 21Mon Sep 21

Moderate rain 72°/64° 💧 0.331 in 💨 7 mph

Tuesday, Sep 22Tue Sep 22

Overcast 68°/68° 💧 0.013 in 💨 3 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Alton

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Alton

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 5:00 AM

PM2.5 Fine particles Good 4,0µg/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 4,7µg/m³

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

O₃ Ozone Fair 66,2µg/m³

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

NO₂ Nitrogen dioxide Good 2,0µg/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 Alton

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 7,6High 😐Moderate

Wednesday UV 7,6High 🙂Fair

Thursday UV 5,5Moderate 😊Good

Friday UV 8,0Very high 😊Good

Saturday UV 9,0Very high —Unavailable

Sunday UV 8,0Very high —Unavailable

Hourly UV index today

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

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 Alton

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · ALTON, ILLINOIS

Tonight's Stargazing & Shooting Stars

Local night-sky conditions and meteor activity for Jasper.

42/100Best-hour score

No good viewing window tonight Astronomical darkness exists, but current sky conditions are unfavorable.

☁ Cloud cover 78% Real hourly forecast for the best viewing hour.

☾ Moonlight 21% Waning Crescent · Moon about 27° above the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 88° high at the best hour.

✦ Estimated visible meteors Poor visibility Meteor activity may occur above the clouds, but local viewing conditions are not suitable.

Chance ≥1 meteor in 30 minNot meaningful

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

Explore current conditions and forecasts for other locations.

Forecast data for Alton were last refreshed today at 4:28 AM. The current forecast period extends through 09/09/2026 at 2:00 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.