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Current weather in St. Charles is overcast clouds.

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

Now · 1:39 AM

St. Charles Weather & Hourly Forecast

United States · Illinois · 60174

65°F

Overcast night

Feels like: 67°F

💧 Humidity 86% 🌡 Pressure 30.12 inHg 💨 Wind 4 mph 👁 Visibility 16.6 mi ☁ Clouds 99% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for St. Charles

Today

2:00 AM

Overcast night

65° 💧 None 💨 4 mph H 86%30.12 inHg

5:00 AM

Clear night

64° 💧 None 💨 4 mph H 85%30.12 inHg

8:00 AM

Sunny

67° 💧 None 💨 4 mph H 83%30.18 inHg

11:00 AM

Sunny

75° 💧 None 💨 7 mph H 51%30.18 inHg

2:00 PM

Mostly sunny

79° 💧 None 💨 5 mph H 44%30.12 inHg

5:00 PM

Mostly cloudy

78° 💧 None 💨 7 mph H 48%30.09 inHg

8:00 PM

Mostly cloudy night

71° 💧 None 💨 7 mph H 69%30.12 inHg

11:00 PM

Mostly cloudy night

68° 💧 None 💨 6 mph H 79%30.12 inHg

Tomorrow

2:00 AM

Overcast night

66° 💧 None 💨 5 mph H 77%30.12 inHg

5:00 AM

Overcast night

64° 💧 None 💨 5 mph H 82%30.15 inHg

8:00 AM

Overcast

65° 💧 None 💨 5 mph H 81%30.12 inHg

11:00 AM

Overcast

76° 💧 None 💨 7 mph H 61%30.12 inHg

2:00 PM

Overcast

82° 💧 None 💨 7 mph H 49%30.06 inHg

5:00 PM

Sunny

84° 💧 None 💨 8 mph H 46%30.03 inHg

8:00 PM

Clear night

79° 💧 None 💨 8 mph H 58%30.00 inHg

11:00 PM

Overcast night

76° 💧 None 💨 8 mph H 60%30.03 inHg

Today

2:00 AM

Overcast night

65° 💧 None 💨 4 mph H 86%30.12 inHg

3:00 AM

Mostly cloudy night

65° 💧 None 💨 4 mph H 86%30.12 inHg

4:00 AM

Overcast night

64° 💧 None 💨 4 mph H 85%30.12 inHg

5:00 AM

Clear night

64° 💧 None 💨 4 mph H 85%30.12 inHg

6:00 AM

Clear night

63° 💧 None 💨 3 mph H 87%30.15 inHg

7:00 AM

Sunny

63° 💧 None 💨 5 mph H 88%30.15 inHg

8:00 AM

Sunny

67° 💧 None 💨 4 mph H 83%30.18 inHg

9:00 AM

Sunny

70° 💧 None 💨 4 mph H 72%30.18 inHg

10:00 AM

Sunny

73° 💧 None 💨 7 mph H 59%30.18 inHg

11:00 AM

Sunny

75° 💧 None 💨 7 mph H 51%30.18 inHg

12:00 PM

Sunny

77° 💧 None 💨 6 mph H 47%30.18 inHg

1:00 PM

Mostly sunny

78° 💧 None 💨 6 mph H 45%30.15 inHg

2:00 PM

Mostly sunny

79° 💧 None 💨 5 mph H 44%30.12 inHg

3:00 PM

Mostly sunny

79° 💧 None 💨 4 mph H 44%30.12 inHg

4:00 PM

Mostly sunny

79° 💧 None 💨 6 mph H 45%30.09 inHg

5:00 PM

Mostly cloudy

78° 💧 None 💨 7 mph H 48%30.09 inHg

6:00 PM

Mostly cloudy

76° 💧 None 💨 7 mph H 53%30.09 inHg

7:00 PM

Mostly cloudy

73° 💧 None 💨 7 mph H 61%30.12 inHg

8:00 PM

Mostly cloudy night

71° 💧 None 💨 7 mph H 69%30.12 inHg

9:00 PM

Overcast night

69° 💧 None 💨 7 mph H 74%30.12 inHg

10:00 PM

Mostly cloudy night

69° 💧 None 💨 6 mph H 77%30.15 inHg

11:00 PM

Mostly cloudy night

68° 💧 None 💨 6 mph H 79%30.12 inHg

Tomorrow

12:00 AM

Mostly cloudy night

68° 💧 None 💨 7 mph H 75%30.12 inHg

1:00 AM

Mostly cloudy night

67° 💧 None 💨 6 mph H 75%30.12 inHg

2:00 AM

Overcast night

66° 💧 None 💨 5 mph H 77%30.12 inHg

3:00 AM

Overcast night

65° 💧 None 💨 4 mph H 79%30.12 inHg

4:00 AM

Overcast night

64° 💧 None 💨 5 mph H 80%30.12 inHg

5:00 AM

Overcast night

64° 💧 None 💨 5 mph H 82%30.15 inHg

6:00 AM

Overcast night

63° 💧 None 💨 6 mph H 84%30.12 inHg

7:00 AM

Overcast

63° 💧 None 💨 6 mph H 85%30.12 inHg

8:00 AM

Overcast

65° 💧 None 💨 5 mph H 81%30.12 inHg

9:00 AM

Overcast

69° 💧 None 💨 5 mph H 74%30.12 inHg

10:00 AM

Overcast

73° 💧 None 💨 5 mph H 68%30.12 inHg

11:00 AM

Overcast

76° 💧 None 💨 7 mph H 61%30.12 inHg

12:00 PM

Overcast

79° 💧 None 💨 8 mph H 54%30.09 inHg

1:00 PM

Overcast

81° 💧 None 💨 7 mph H 50%30.09 inHg

2:00 PM

Overcast

82° 💧 None 💨 7 mph H 49%30.06 inHg

3:00 PM

Mostly cloudy

84° 💧 None 💨 7 mph H 48%30.06 inHg

4:00 PM

Mostly sunny

84° 💧 None 💨 8 mph H 46%30.03 inHg

5:00 PM

Sunny

84° 💧 None 💨 8 mph H 46%30.03 inHg

6:00 PM

Sunny

83° 💧 None 💨 8 mph H 49%30.00 inHg

7:00 PM

Sunny

80° 💧 None 💨 8 mph H 54%30.00 inHg

8:00 PM

Clear night

79° 💧 None 💨 8 mph H 58%30.00 inHg

9:00 PM

Clear night

78° 💧 None 💨 8 mph H 60%30.03 inHg

10:00 PM

Overcast night

77° 💧 None 💨 8 mph H 60%30.03 inHg

11:00 PM

Overcast night

76° 💧 None 💨 8 mph H 60%30.03 inHg

Wednesday

12:00 AM

Overcast night

75° 💧 None 💨 8 mph H 61%30.00 inHg

1:00 AM

Mostly cloudy night

74° 💧 None 💨 9 mph H 61%30.00 inHg

2:00 AM

Mostly cloudy night

74° 💧 None 💨 9 mph H 60%29.97 inHg

3:00 AM

Mostly cloudy night

74° 💧 None 💨 9 mph H 59%29.97 inHg

4:00 AM

Overcast night

74° 💧 None 💨 9 mph H 56%29.97 inHg

5:00 AM

Overcast night

74° 💧 None 💨 9 mph H 54%29.97 inHg

6:00 AM

Overcast night

74° 💧 None 💨 8 mph H 55%29.97 inHg

7:00 AM

Light thunderstorms

72° 💧 0.009 in 💨 9 mph H 66%30.00 inHg

8:00 AM

Overcast

73° 💧 0.003 in 💨 8 mph H 72%30.00 inHg

9:00 AM

Light thunderstorms

72° 💧 0.055 in 💨 11 mph H 89%30.03 inHg

10:00 AM

Light thunderstorms

72° 💧 0.061 in 💨 12 mph H 93%30.00 inHg

11:00 AM

Light thunderstorms

74° 💧 0.034 in 💨 10 mph H 92%30.00 inHg

12:00 PM

Light rain

75° 💧 0.031 in 💨 8 mph H 90%30.00 inHg

1:00 PM

Overcast

78° 💧 0.001 in 💨 10 mph H 79%29.97 inHg

2:00 PM

Overcast

80° 💧 0.001 in 💨 8 mph H 76%29.97 inHg

3:00 PM

Overcast

80° 💧 0.001 in 💨 8 mph H 77%29.94 inHg

4:00 PM

Light rain

78° 💧 0.026 in 💨 7 mph H 87%29.94 inHg

5:00 PM

Light rain

77° 💧 0.011 in 💨 6 mph H 91%29.94 inHg

6:00 PM

Mostly cloudy

77° 💧 0.000 in 💨 5 mph H 90%29.94 inHg

7:00 PM

Overcast

76° 💧 None 💨 6 mph H 91%29.94 inHg

10:00 PM

Partly cloudy night

70° 💧 None 💨 7 mph H 92%29.94 inHg

Thursday

1:00 AM

Clear night

68° 💧 None 💨 7 mph H 91%29.97 inHg

4:00 AM

Clear night

64° 💧 None 💨 5 mph H 90%29.97 inHg

7:00 AM

Sunny

62° 💧 None 💨 6 mph H 90%30.00 inHg

10:00 AM

Sunny

70° 💧 None 💨 8 mph H 66%30.03 inHg

1:00 PM

Sunny

75° 💧 None 💨 9 mph H 48%30.00 inHg

4:00 PM

Sunny

76° 💧 None 💨 8 mph H 47%29.97 inHg

7:00 PM

Sunny

70° 💧 None 💨 3 mph H 65%29.94 inHg

10:00 PM

Clear night

65° 💧 None 💨 2 mph H 81%29.97 inHg

Friday

1:00 AM

Clear night

62° 💧 None 💨 3 mph H 86%30.00 inHg

4:00 AM

Clear night

60° 💧 None 💨 5 mph H 86%29.97 inHg

7:00 AM

Sunny

59° 💧 None 💨 6 mph H 91%30.00 inHg

10:00 AM

Sunny

71° 💧 None 💨 7 mph H 64%29.97 inHg

1:00 PM

Sunny

78° 💧 None 💨 7 mph H 47%29.91 inHg

4:00 PM

Sunny

80° 💧 None 💨 9 mph H 40%29.83 inHg

7:00 PM

Sunny

75° 💧 None 💨 5 mph H 51%29.83 inHg

10:00 PM

Clear night

70° 💧 None 💨 8 mph H 63%29.83 inHg

Saturday

1:00 AM

Mostly clear night

67° 💧 None 💨 9 mph H 75%29.80 inHg

4:00 AM

Partly cloudy night

66° 💧 None 💨 9 mph H 77%29.77 inHg

7:00 AM

Overcast

68° 💧 None 💨 9 mph H 76%29.80 inHg

10:00 AM

Sunny

75° 💧 None 💨 8 mph H 73%29.83 inHg

1:00 PM

Sunny

85° 💧 None 💨 9 mph H 59%29.83 inHg

7:00 PM

Overcast

81° 💧 None 💨 9 mph H 60%29.88 inHg

Sunday

1:00 AM

Clear night

75° 💧 None 💨 3 mph H 75%29.91 inHg

7:00 AM

Partly cloudy

65° 💧 None 💨 4 mph H 83%30.03 inHg

1:00 PM

Mostly cloudy

63° 💧 None 💨 4 mph H 77%30.06 inHg

7:00 PM

Overcast

80° 💧 None 💨 4 mph H 60%30.03 inHg

Monday

1:00 AM

Heavy rain

70° 💧 None 💨 8 mph H 92%30.03 inHg

7:00 AM

Overcast

65° 💧 None 💨 8 mph H 96%30.06 inHg

1:00 PM

Mostly cloudy

65° 💧 None 💨 10 mph H 95%30.06 inHg

7:00 PM

Mostly cloudy

78° 💧 None 💨 7 mph H 78%30.00 inHg

Tuesday

1:00 AM

Mostly clear night

81° 💧 None 💨 9 mph H 77%29.85 inHg

7:00 AM

Mostly sunny

80° 💧 None 💨 13 mph H 64%29.83 inHg

1:00 PM

Overcast

74° 💧 None 💨 10 mph H 82%29.88 inHg

7:00 PM

Mostly cloudy

73° 💧 None 💨 8 mph H 55%30.06 inHg

Wednesday

1:00 AM

Overcast night

66° 💧 None 💨 6 mph H 73%30.15 inHg

7:00 AM

Sunny

59° 💧 None 💨 5 mph H 84%30.24 inHg

1:00 PM

Sunny

56° 💧 None 💨 6 mph H 87%30.33 inHg

7:00 PM

Mostly sunny

73° 💧 None 💨 5 mph H 56%30.36 inHg

Thursday

1:00 AM

Mostly clear night

66° 💧 None 💨 6 mph H 69%30.33 inHg

7:00 AM

Sunny

60° 💧 None 💨 4 mph H 87%30.36 inHg

1:00 PM

Sunny

59° 💧 None 💨 3 mph H 91%30.39 inHg

7:00 PM

Mostly sunny

73° 💧 None 💨 6 mph H 55%30.36 inHg

Friday

1:00 AM

Mostly clear night

66° 💧 None 💨 5 mph H 66%30.30 inHg

7:00 AM

Mostly cloudy

60° 💧 None 💨 5 mph H 86%30.30 inHg

1:00 PM

Sunny

58° 💧 None 💨 7 mph H 93%30.30 inHg

7:00 PM

Mostly clear night

65° 💧 None 💨 16 mph H 59%30.36 inHg

Saturday

1:00 AM

Mostly clear night

57° 💧 None 💨 13 mph H 60%30.39 inHg

7:00 AM

Partly cloudy

52° 💧 None 💨 8 mph H 62%30.42 inHg

1:00 PM

Overcast

50° 💧 None 💨 8 mph H 72%30.45 inHg

7:00 PM

Overcast night

58° 💧 None 💨 9 mph H 63%30.42 inHg

Sunday

1:00 AM

Mostly clear night

56° 💧 None 💨 9 mph H 60%30.39 inHg

7:00 AM

Sunny

50° 💧 None 💨 6 mph H 81%30.36 inHg

1:00 PM

Sunny

48° 💧 None 💨 1 mph H 79%30.42 inHg

7:00 PM

Mostly clear night

63° 💧 None 💨 6 mph H 48%30.36 inHg

Monday

1:00 AM

Clear night

56° 💧 None 💨 5 mph H 57%30.30 inHg

7:00 AM

Sunny

52° 💧 None 💨 4 mph H 82%30.30 inHg

1:00 PM

Sunny

47° 💧 None 💨 4 mph H 81%30.33 inHg

In St. Charles 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 St. Charles

TomorrowTomorrow

Mostly cloudy 84°/63° 💧 None 💨 8 mph

Wednesday, Sep 9Wed Sep 9

Light thunderstorms 80°/72° 💧 None 💨 12 mph

Thursday, Sep 10Thu Sep 10

Overcast 76°/62° 💧 None 💨 9 mph

Friday, Sep 11Fri Sep 11

Sunny 80°/59° 💧 None 💨 9 mph

Saturday, Sep 12Sat Sep 12

Mostly sunny 85°/66° 💧 0.068 in 💨 9 mph

Sunday, Sep 13Sun Sep 13

Overcast 81°/63° 💧 0.159 in 💨 9 mph

Monday, Sep 14Mon Sep 14

Heavy rain 80°/65° 💧 0.535 in 💨 10 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 81°/74° 💧 0.004 in 💨 13 mph

Wednesday, Sep 16Wed Sep 16

Mostly cloudy 73°/56° 💧 0.001 in 💨 8 mph

Thursday, Sep 17Thu Sep 17

Mostly sunny 73°/59° 💧 None 💨 6 mph

Friday, Sep 18Fri Sep 18

Mostly sunny 73°/58° 💧 None 💨 7 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 65°/50° 💧 0.007 in 💨 16 mph

Sunday, Sep 20Sun Sep 20

Overcast 58°/48° 💧 0.008 in 💨 9 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 63°/47° 💧 0.001 in 💨 6 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in St. Charles

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for St. Charles

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 2:00 AM

PM2.5 Fine particles Good 4,5µg/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 5,2µg/m³

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

O₃ Ozone Good 48,5µg/m³

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

NO₂ Nitrogen dioxide Good 6,0µg/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 St. Charles

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 7,2High 😊Good

Tomorrow UV 6,9High 😐Moderate

Wednesday UV 2,5Low 🙂Fair

Thursday UV 5,9Moderate 🙂Fair

Friday UV 5,0Moderate 😊Good

Saturday UV 7,0High —Unavailable

Sunday UV 6,0High —Unavailable

Hourly UV index today

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

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 St. Charles

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · ST. CHARLES, ILLINOIS

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 5:00 AM–6:00 AM.

91/100Best-hour score

BEST TIME TONIGHT 5:00 AM–6:00 AM Astronomical darkness: 8:55 PM–4:48 AM

☁ Cloud cover 10% Real hourly forecast for the best viewing hour.

☾ Moonlight 21% Waning Crescent · Moon about 29° 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 1–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min74%

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 St. Charles were last refreshed today at 1:39 AM. The current forecast period extends through 08/09/2026 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.