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Current weather in Potomac is few clouds.

Where can I find the hourly weather forecast for Potomac?

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

Is the weather forecast for Potomac updated regularly?

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

Now · 3:50 PM

Potomac Weather & Hourly Forecast

United States · Illinois · 61865

75°F

Mostly sunny

Feels like: 70°F

💧 Humidity 39% 🌡 Pressure 30.12 inHg 💨 Wind 9 mph 👁 Visibility 27.0 mi ☁ Clouds 31% ☀️ UV index 4.3 · Moderate 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Potomac

Today

4:00 PM

Mostly sunny

75° 💧 None 💨 9 mph H 39%30.12 inHg

7:00 PM

Mostly cloudy

71° 💧 None 💨 9 mph H 51%30.06 inHg

10:00 PM

Clear night

68° 💧 None 💨 11 mph H 59%30.09 inHg

Tomorrow

1:00 AM

Overcast night

68° 💧 None 💨 12 mph H 62%30.03 inHg

4:00 AM

Mostly cloudy night

67° 💧 None 💨 9 mph H 65%30.06 inHg

7:00 AM

Sunny

67° 💧 None 💨 11 mph H 69%30.06 inHg

10:00 AM

Sunny

80° 💧 None 💨 11 mph H 56%30.09 inHg

1:00 PM

Sunny

91° 💧 None 💨 11 mph H 49%30.03 inHg

4:00 PM

Sunny

93° 💧 0.000 in 💨 8 mph H 44%30.03 inHg

7:00 PM

Light rain

84° 💧 0.034 in 💨 4 mph H 63%30.06 inHg

10:00 PM

Mostly clear night

75° 💧 0.000 in 💨 2 mph H 93%30.12 inHg

Wednesday

1:00 AM

Clear night

73° 💧 None 💨 2 mph H 96%30.15 inHg

4:00 AM

Light thunderstorms

72° 💧 0.116 in 💨 5 mph H 97%30.18 inHg

7:00 AM

Partly cloudy

70° 💧 0.001 in 💨 4 mph H 99%30.21 inHg

10:00 AM

Mostly sunny

80° 💧 0.001 in 💨 5 mph H 80%30.24 inHg

1:00 PM

Sunny

87° 💧 0.018 in 💨 4 mph H 65%30.21 inHg

Today

4:00 PM

Mostly sunny

75° 💧 None 💨 9 mph H 39%30.12 inHg

5:00 PM

Overcast

75° 💧 None 💨 10 mph H 40%30.09 inHg

6:00 PM

Overcast

74° 💧 None 💨 10 mph H 45%30.06 inHg

7:00 PM

Mostly cloudy

71° 💧 None 💨 9 mph H 51%30.06 inHg

8:00 PM

Mostly cloudy night

70° 💧 None 💨 10 mph H 55%30.06 inHg

9:00 PM

Clear night

69° 💧 None 💨 11 mph H 57%30.09 inHg

10:00 PM

Clear night

68° 💧 None 💨 11 mph H 59%30.09 inHg

11:00 PM

Clear night

68° 💧 None 💨 11 mph H 61%30.09 inHg

Tomorrow

12:00 AM

Partly cloudy night

68° 💧 None 💨 13 mph H 62%30.06 inHg

1:00 AM

Overcast night

68° 💧 None 💨 12 mph H 62%30.03 inHg

2:00 AM

Overcast night

68° 💧 None 💨 11 mph H 63%30.03 inHg

3:00 AM

Overcast night

68° 💧 None 💨 10 mph H 64%30.06 inHg

4:00 AM

Mostly cloudy night

67° 💧 None 💨 9 mph H 65%30.06 inHg

5:00 AM

Partly cloudy night

67° 💧 None 💨 9 mph H 67%30.06 inHg

6:00 AM

Mostly clear night

67° 💧 None 💨 10 mph H 68%30.06 inHg

7:00 AM

Sunny

67° 💧 None 💨 11 mph H 69%30.06 inHg

8:00 AM

Mostly sunny

70° 💧 None 💨 9 mph H 66%30.09 inHg

9:00 AM

Mostly sunny

75° 💧 None 💨 10 mph H 61%30.09 inHg

10:00 AM

Sunny

80° 💧 None 💨 11 mph H 56%30.09 inHg

11:00 AM

Sunny

84° 💧 None 💨 12 mph H 53%30.06 inHg

12:00 PM

Sunny

88° 💧 None 💨 11 mph H 51%30.06 inHg

1:00 PM

Sunny

91° 💧 None 💨 11 mph H 49%30.03 inHg

2:00 PM

Sunny

92° 💧 None 💨 11 mph H 46%30.03 inHg

3:00 PM

Strong thunderstorm

93° 💧 None 💨 10 mph H 45%30.03 inHg

4:00 PM

Sunny

93° 💧 0.000 in 💨 8 mph H 44%30.03 inHg

5:00 PM

Mostly sunny

92° 💧 None 💨 8 mph H 45%30.03 inHg

6:00 PM

Mostly sunny

89° 💧 0.000 in 💨 4 mph H 53%30.03 inHg

7:00 PM

Light rain

84° 💧 0.005 in 💨 4 mph H 63%30.06 inHg

8:00 PM

Light rain

80° 💧 0.019 in 💨 8 mph H 78%30.09 inHg

9:00 PM

Light rain

77° 💧 0.010 in 💨 5 mph H 89%30.12 inHg

10:00 PM

Mostly clear night

75° 💧 None 💨 2 mph H 93%30.12 inHg

11:00 PM

Clear night

74° 💧 0.000 in 💨 3 mph H 95%30.15 inHg

Wednesday

12:00 AM

Clear night

73° 💧 None 💨 3 mph H 96%30.15 inHg

1:00 AM

Clear night

73° 💧 None 💨 2 mph H 96%30.15 inHg

2:00 AM

Clear night

72° 💧 None 💨 3 mph H 97%30.15 inHg

3:00 AM

Mostly cloudy night

72° 💧 None 💨 5 mph H 97%30.18 inHg

4:00 AM

Light thunderstorms

72° 💧 0.021 in 💨 5 mph H 97%30.18 inHg

5:00 AM

Light thunderstorms

71° 💧 0.090 in 💨 6 mph H 99%30.18 inHg

6:00 AM

Light rain

70° 💧 0.005 in 💨 7 mph H 99%30.21 inHg

7:00 AM

Partly cloudy

70° 💧 0.000 in 💨 4 mph H 99%30.21 inHg

8:00 AM

Mostly sunny

72° 💧 0.000 in 💨 3 mph H 96%30.24 inHg

9:00 AM

Mostly sunny

75° 💧 0.000 in 💨 4 mph H 91%30.24 inHg

10:00 AM

Mostly sunny

80° 💧 0.000 in 💨 5 mph H 80%30.24 inHg

11:00 AM

Mostly sunny

83° 💧 0.000 in 💨 4 mph H 72%30.27 inHg

12:00 PM

Mostly sunny

86° 💧 0.001 in 💨 4 mph H 67%30.24 inHg

1:00 PM

Sunny

87° 💧 0.001 in 💨 4 mph H 65%30.21 inHg

2:00 PM

Light thunderstorms

88° 💧 0.005 in 💨 3 mph H 63%30.21 inHg

3:00 PM

Light thunderstorms

89° 💧 0.012 in 💨 4 mph H 63%30.18 inHg

4:00 PM

Light thunderstorms

89° 💧 0.009 in 💨 2 mph H 60%30.18 inHg

5:00 PM

Light thunderstorms

89° 💧 0.002 in 💨 2 mph H 59%30.15 inHg

6:00 PM

Partly cloudy

87° 💧 0.003 in 💨 3 mph H 66%30.15 inHg

7:00 PM

Partly cloudy night

82° 💧 0.002 in 💨 7 mph H 81%30.15 inHg

8:00 PM

Mostly clear night

80° 💧 0.002 in 💨 8 mph H 85%30.18 inHg

9:00 PM

Clear night

79° 💧 0.000 in 💨 6 mph H 85%30.18 inHg

10:00 PM

Clear night

78° 💧 0.000 in 💨 6 mph H 88%30.18 inHg

11:00 PM

Clear night

78° 💧 None 💨 7 mph H 90%30.18 inHg

Thursday

12:00 AM

Clear night

77° 💧 None 💨 7 mph H 90%30.15 inHg

1:00 AM

Clear night

77° 💧 None 💨 7 mph H 90%30.15 inHg

2:00 AM

Clear night

76° 💧 None 💨 7 mph H 88%30.15 inHg

3:00 AM

Clear night

76° 💧 None 💨 7 mph H 83%30.15 inHg

4:00 AM

Clear night

77° 💧 None 💨 8 mph H 77%30.15 inHg

5:00 AM

Mostly clear night

77° 💧 None 💨 9 mph H 74%30.15 inHg

6:00 AM

Overcast night

77° 💧 None 💨 8 mph H 73%30.15 inHg

7:00 AM

Overcast

77° 💧 None 💨 8 mph H 73%30.15 inHg

10:00 AM

Mostly sunny

86° 💧 None 💨 8 mph H 58%30.18 inHg

1:00 PM

Partly cloudy

92° 💧 None 💨 7 mph H 51%30.15 inHg

4:00 PM

Light rain

89° 💧 None 💨 8 mph H 58%30.09 inHg

7:00 PM

Mostly clear night

83° 💧 None 💨 5 mph H 71%30.12 inHg

10:00 PM

Mostly clear night

76° 💧 None 💨 9 mph H 87%30.18 inHg

Friday

1:00 AM

Clear night

71° 💧 None 💨 8 mph H 86%30.18 inHg

4:00 AM

Clear night

70° 💧 None 💨 7 mph H 87%30.18 inHg

7:00 AM

Mostly sunny

70° 💧 None 💨 6 mph H 91%30.21 inHg

10:00 AM

Partly cloudy

78° 💧 None 💨 7 mph H 77%30.21 inHg

1:00 PM

Overcast

83° 💧 None 💨 7 mph H 65%30.15 inHg

4:00 PM

Overcast

82° 💧 None 💨 5 mph H 65%30.09 inHg

7:00 PM

Partly cloudy night

78° 💧 None 💨 9 mph H 67%30.09 inHg

10:00 PM

Mostly clear night

74° 💧 None 💨 10 mph H 73%30.09 inHg

Saturday

1:00 AM

Mostly clear night

72° 💧 None 💨 9 mph H 79%30.03 inHg

4:00 AM

Mostly clear night

70° 💧 None 💨 8 mph H 84%30.00 inHg

7:00 AM

Sunny

70° 💧 None 💨 10 mph H 88%30.00 inHg

10:00 AM

Mostly cloudy

80° 💧 None 💨 10 mph H 71%29.97 inHg

1:00 PM

Mostly sunny

91° 💧 None 💨 11 mph H 51%29.91 inHg

4:00 PM

Sunny

94° 💧 None 💨 12 mph H 35%29.83 inHg

7:00 PM

Clear night

86° 💧 None 💨 8 mph H 44%29.83 inHg

10:00 PM

Mostly clear night

79° 💧 None 💨 6 mph H 57%29.83 inHg

Sunday

1:00 AM

Mostly clear night

77° 💧 None 💨 5 mph H 61%29.83 inHg

4:00 AM

Light rain

74° 💧 None 💨 3 mph H 78%29.85 inHg

7:00 AM

Overcast

73° 💧 None 💨 4 mph H 92%29.85 inHg

1:00 PM

Overcast

78° 💧 None 💨 5 mph H 78%29.88 inHg

7:00 PM

Light rain

71° 💧 None 💨 8 mph H 96%29.88 inHg

Monday

1:00 AM

Overcast night

66° 💧 None 💨 8 mph H 94%29.94 inHg

7:00 AM

Overcast

64° 💧 None 💨 9 mph H 92%29.97 inHg

1:00 PM

Overcast

70° 💧 None 💨 12 mph H 73%30.00 inHg

7:00 PM

Overcast night

68° 💧 None 💨 12 mph H 68%30.03 inHg

Tuesday

1:00 AM

Overcast night

62° 💧 None 💨 10 mph H 76%30.09 inHg

7:00 AM

Overcast

56° 💧 None 💨 11 mph H 82%30.18 inHg

1:00 PM

Partly cloudy

69° 💧 None 💨 14 mph H 50%30.21 inHg

7:00 PM

Overcast night

66° 💧 None 💨 12 mph H 57%30.18 inHg

Wednesday

1:00 AM

Overcast night

58° 💧 None 💨 12 mph H 56%30.27 inHg

7:00 AM

Overcast

56° 💧 None 💨 11 mph H 76%30.27 inHg

1:00 PM

Overcast

68° 💧 None 💨 10 mph H 63%30.27 inHg

7:00 PM

Partly cloudy night

67° 💧 None 💨 11 mph H 71%30.24 inHg

Thursday

1:00 AM

Overcast night

63° 💧 None 💨 8 mph H 76%30.27 inHg

7:00 AM

Partly cloudy

63° 💧 None 💨 9 mph H 74%30.30 inHg

1:00 PM

Sunny

74° 💧 None 💨 7 mph H 62%30.27 inHg

7:00 PM

Overcast night

73° 💧 None 💨 6 mph H 67%30.24 inHg

Friday

1:00 AM

Mostly clear night

66° 💧 None 💨 6 mph H 69%30.27 inHg

7:00 AM

Mostly sunny

63° 💧 None 💨 5 mph H 71%30.30 inHg

1:00 PM

Mostly sunny

74° 💧 None 💨 2 mph H 56%30.27 inHg

7:00 PM

Mostly clear night

71° 💧 None 💨 4 mph H 70%30.21 inHg

Saturday

1:00 AM

Mostly cloudy night

62° 💧 None 💨 4 mph H 74%30.21 inHg

7:00 AM

Overcast

58° 💧 None 💨 4 mph H 87%30.21 inHg

1:00 PM

Overcast

76° 💧 None 💨 5 mph H 53%30.15 inHg

7:00 PM

Overcast night

71° 💧 None 💨 5 mph H 68%30.09 inHg

Sunday

1:00 AM

Overcast night

65° 💧 None 💨 5 mph H 80%30.06 inHg

7:00 AM

Overcast

62° 💧 None 💨 4 mph H 90%30.03 inHg

1:00 PM

Sunny

81° 💧 None 💨 4 mph H 50%29.97 inHg

7:00 PM

Partly cloudy night

75° 💧 None 💨 1 mph H 66%29.88 inHg

Monday

1:00 AM

Clear night

68° 💧 None 💨 4 mph H 82%29.88 inHg

7:00 AM

Mostly cloudy

66° 💧 None 💨 2 mph H 83%29.91 inHg

1:00 PM

Mostly cloudy

86° 💧 None 💨 7 mph H 45%29.88 inHg

7:00 PM

Partly cloudy night

79° 💧 None 💨 3 mph H 64%29.85 inHg

Tuesday

1:00 AM

Clear night

69° 💧 None 💨 3 mph H 88%29.91 inHg

7:00 AM

Sunny

66° 💧 None 💨 3 mph H 94%29.97 inHg

In Potomac and, more broadly, across the state of Illinois: The late afternoon will feature a mix of sun and clouds, with temperatures remaining mild to warm between 69 and 77 degrees Fahrenheit. Winds will be from the southeast at around 14 mph, with gusts reaching up to 35 mph. As evening approaches, skies will remain partly cloudy, and no precipitation is expected. Winds may slightly diminish but will continue to be moderate, providing a gentle breeze as temperatures gradually cool. Overall, conditions are expected to stay dry and comfortable through the evening hours.

15-Day Weather Outlook for Potomac

TomorrowTomorrow

Strong thunderstorm 94°/67° 💧 None 💨 12 mph

Wednesday, Sep 16Wed Sep 16

Light thunderstorms 93°/71° 💧 None 💨 9 mph

Thursday, Sep 17Thu Sep 17

Mostly sunny 93°/77° 💧 0.112 in 💨 9 mph

Friday, Sep 18Fri Sep 18

Mostly sunny 82°/70° 💧 0.004 in 💨 9 mph

Saturday, Sep 19Sat Sep 19

Partly cloudy 94°/68° 💧 0.001 in 💨 10 mph

Sunday, Sep 20Sun Sep 20

Moderate rain 92°/77° 💧 0.129 in 💨 11 mph

Monday, Sep 21Mon Sep 21

Moderate rain 87°/71° 💧 0.180 in 💨 8 mph

Tuesday, Sep 22Tue Sep 22

Overcast 75°/53° 💧 0.002 in 💨 16 mph

Wednesday, Sep 23Wed Sep 23

Sunny 71°/50° 💧 None 💨 8 mph

Thursday, Sep 24Thu Sep 24

Mostly sunny 72°/50° 💧 None 💨 6 mph

Friday, Sep 25Fri Sep 25

Mostly sunny 75°/52° 💧 None 💨 4 mph

Saturday, Sep 26Sat Sep 26

Mostly sunny 76°/54° 💧 None 💨 5 mph

Sunday, Sep 27Sun Sep 27

Partly cloudy 79°/56° 💧 None 💨 4 mph

Monday, Sep 28Mon Sep 28

Overcast 81°/59° 💧 None 💨 6 mph

Tuesday, Sep 29Tue Sep 29

Partly cloudy 76°/76° 💧 None 💨 5 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Potomac

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Potomac

Hourly forecast · Updated every 2 hours

Moderate

Nearest forecast value 4:00 PM

PM2.5 Fine particles Good 3,5µg/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 3,8µg/m³

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

O₃ Ozone Moderate 101,9µg/m³

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

NO₂ Nitrogen dioxide Good 1,0µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Sensitive people should reduce strenuous and prolonged outdoor exertion.

UV & HEALTH

UV, Sun & Health Outlook in Potomac

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 5,9Moderate 😐Moderate

Tomorrow UV 7,0High 🙂Fair

Wednesday UV 5,9Moderate 🙂Fair

Thursday UV 7,0High 😐Moderate

Friday UV 7,0High 😐Moderate

Saturday UV 8,0Very high —Unavailable

Sunday UV 4,0Moderate —Unavailable

Hourly UV index today

4:00 PMUV 1,8 5:00 PMUV 1,0 6:00 PMUV 0,3 7:00 PMUV 0,0

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

Moderate UV risk

Sunglasses and sun protection are recommended for prolonged exposure.

Caution for sensitive people

People with respiratory or cardiovascular conditions should reduce prolonged outdoor exertion.

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 Potomac

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · POTOMAC, ILLINOIS

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 11:00 PM–12:00 AM.

99/100Best-hour score

BEST TIME TONIGHT 11:00 PM–12:00 AM Astronomical darkness: 8:34 PM–5:00 AM

☁ Cloud cover 1% Real hourly forecast for the best viewing hour.

☾ Moonlight 12% Waxing Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 30° high at the best hour.

✦ Estimated visible meteors 1–3/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min57%

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

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Forecast data for Potomac were last refreshed today at 3:50 PM. The current forecast period extends through 16/09/2026 at 1:00 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.