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Current weather in Mendon is broken clouds.

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

Now · 6:38 PM

Mendon Weather & Hourly Forecast

United States · Illinois · 62351

71°F

Mostly cloudy

Feels like: 70°F

💧 Humidity 56% 🌡 Pressure 30.06 inHg 💨 Wind 5 mph 👁 Visibility 22.8 mi ☁ Clouds 94% ☀️ UV index 0.4 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Mendon

Today

7:00 PM

Mostly cloudy

71° 💧 None 💨 5 mph H 56%30.06 inHg

10:00 PM

Partly cloudy night

69° 💧 None 💨 7 mph H 58%30.12 inHg

Tomorrow

1:00 AM

Mostly cloudy night

66° 💧 None 💨 10 mph H 61%30.15 inHg

4:00 AM

Overcast night

64° 💧 None 💨 10 mph H 65%30.15 inHg

7:00 AM

Mostly cloudy

64° 💧 None 💨 10 mph H 66%30.15 inHg

10:00 AM

Mostly cloudy

70° 💧 None 💨 11 mph H 62%30.15 inHg

1:00 PM

Sunny

80° 💧 None 💨 13 mph H 46%30.06 inHg

4:00 PM

Sunny

85° 💧 0.000 in 💨 14 mph H 47%29.97 inHg

7:00 PM

Sunny

80° 💧 None 💨 14 mph H 57%29.88 inHg

10:00 PM

Overcast night

79° 💧 None 💨 17 mph H 63%29.91 inHg

Tuesday

1:00 AM

Overcast night

79° 💧 None 💨 13 mph H 73%29.91 inHg

4:00 AM

Partly cloudy night

78° 💧 None 💨 14 mph H 75%29.91 inHg

7:00 AM

Light thunderstorms

73° 💧 0.068 in 💨 11 mph H 89%30.00 inHg

10:00 AM

Light thunderstorms

77° 💧 0.049 in 💨 4 mph H 89%30.03 inHg

1:00 PM

Sunny

86° 💧 0.003 in 💨 6 mph H 62%30.03 inHg

4:00 PM

Light thunderstorms

88° 💧 0.013 in 💨 5 mph H 58%30.03 inHg

Today

7:00 PM

Mostly cloudy

71° 💧 None 💨 5 mph H 56%30.06 inHg

8:00 PM

Overcast night

70° 💧 None 💨 6 mph H 58%30.09 inHg

9:00 PM

Mostly cloudy night

70° 💧 None 💨 7 mph H 58%30.12 inHg

10:00 PM

Partly cloudy night

69° 💧 None 💨 7 mph H 58%30.12 inHg

11:00 PM

Overcast night

67° 💧 None 💨 8 mph H 60%30.15 inHg

Tomorrow

12:00 AM

Overcast night

67° 💧 None 💨 9 mph H 60%30.15 inHg

1:00 AM

Mostly cloudy night

66° 💧 None 💨 10 mph H 61%30.15 inHg

2:00 AM

Overcast night

65° 💧 None 💨 10 mph H 62%30.15 inHg

3:00 AM

Overcast night

65° 💧 None 💨 10 mph H 63%30.15 inHg

4:00 AM

Overcast night

64° 💧 None 💨 10 mph H 65%30.15 inHg

5:00 AM

Overcast night

65° 💧 None 💨 10 mph H 66%30.15 inHg

6:00 AM

Overcast night

64° 💧 None 💨 9 mph H 65%30.15 inHg

7:00 AM

Mostly cloudy

64° 💧 None 💨 10 mph H 66%30.15 inHg

8:00 AM

Overcast

65° 💧 None 💨 9 mph H 67%30.18 inHg

9:00 AM

Overcast

67° 💧 None 💨 10 mph H 65%30.15 inHg

10:00 AM

Mostly cloudy

70° 💧 None 💨 11 mph H 62%30.15 inHg

11:00 AM

Mostly cloudy

73° 💧 None 💨 11 mph H 57%30.12 inHg

12:00 PM

Partly cloudy

76° 💧 None 💨 12 mph H 51%30.12 inHg

1:00 PM

Sunny

80° 💧 None 💨 13 mph H 46%30.06 inHg

2:00 PM

Sunny

82° 💧 None 💨 14 mph H 46%30.03 inHg

3:00 PM

Sunny

84° 💧 None 💨 14 mph H 46%30.00 inHg

4:00 PM

Sunny

85° 💧 None 💨 14 mph H 47%29.97 inHg

5:00 PM

Sunny

85° 💧 0.000 in 💨 15 mph H 49%29.94 inHg

6:00 PM

Sunny

83° 💧 None 💨 14 mph H 54%29.91 inHg

7:00 PM

Sunny

80° 💧 None 💨 14 mph H 57%29.88 inHg

8:00 PM

Clear night

79° 💧 None 💨 15 mph H 56%29.88 inHg

9:00 PM

Clear night

79° 💧 None 💨 14 mph H 58%29.91 inHg

10:00 PM

Overcast night

79° 💧 None 💨 17 mph H 63%29.91 inHg

11:00 PM

Overcast night

80° 💧 None 💨 16 mph H 68%29.94 inHg

Tuesday

12:00 AM

Overcast night

79° 💧 None 💨 15 mph H 71%29.91 inHg

1:00 AM

Overcast night

79° 💧 None 💨 13 mph H 73%29.91 inHg

2:00 AM

Overcast night

78° 💧 None 💨 14 mph H 75%29.91 inHg

3:00 AM

Mostly cloudy night

78° 💧 None 💨 15 mph H 75%29.88 inHg

4:00 AM

Partly cloudy night

78° 💧 None 💨 14 mph H 75%29.91 inHg

5:00 AM

Partly cloudy night

78° 💧 None 💨 14 mph H 74%29.91 inHg

6:00 AM

Mostly clear night

78° 💧 None 💨 13 mph H 74%29.91 inHg

7:00 AM

Light thunderstorms

73° 💧 0.024 in 💨 11 mph H 89%30.00 inHg

8:00 AM

Light rain

74° 💧 0.033 in 💨 2 mph H 91%30.03 inHg

9:00 AM

Light rain

75° 💧 0.011 in 💨 2 mph H 90%30.03 inHg

10:00 AM

Light thunderstorms

77° 💧 0.043 in 💨 4 mph H 89%30.03 inHg

11:00 AM

Light rain

80° 💧 0.006 in 💨 4 mph H 77%30.06 inHg

12:00 PM

Sunny

83° 💧 None 💨 5 mph H 67%30.06 inHg

1:00 PM

Sunny

86° 💧 None 💨 6 mph H 62%30.03 inHg

2:00 PM

Mostly sunny

88° 💧 None 💨 6 mph H 59%30.03 inHg

3:00 PM

Mostly sunny

88° 💧 0.003 in 💨 6 mph H 57%30.03 inHg

4:00 PM

Light thunderstorms

88° 💧 0.005 in 💨 5 mph H 58%30.03 inHg

5:00 PM

Light thunderstorms

85° 💧 0.005 in 💨 8 mph H 62%30.03 inHg

6:00 PM

Partly cloudy

79° 💧 0.003 in 💨 10 mph H 79%30.06 inHg

7:00 PM

Partly cloudy

77° 💧 0.000 in 💨 9 mph H 85%30.09 inHg

8:00 PM

Mostly clear night

74° 💧 None 💨 9 mph H 89%30.12 inHg

9:00 PM

Mostly clear night

73° 💧 0.000 in 💨 9 mph H 88%30.15 inHg

10:00 PM

Strong thunderstorm

72° 💧 0.001 in 💨 7 mph H 84%30.18 inHg

11:00 PM

Partly cloudy night

72° 💧 0.002 in 💨 7 mph H 85%30.18 inHg

Wednesday

12:00 AM

Light rain

71° 💧 0.010 in 💨 8 mph H 91%30.18 inHg

1:00 AM

Mostly cloudy night

70° 💧 0.002 in 💨 9 mph H 91%30.18 inHg

2:00 AM

Overcast night

69° 💧 0.000 in 💨 6 mph H 91%30.18 inHg

3:00 AM

Mostly cloudy night

68° 💧 None 💨 8 mph H 92%30.21 inHg

4:00 AM

Mostly cloudy night

68° 💧 None 💨 9 mph H 91%30.18 inHg

5:00 AM

Mostly cloudy night

68° 💧 None 💨 8 mph H 91%30.21 inHg

6:00 AM

Mostly cloudy night

68° 💧 None 💨 8 mph H 91%30.21 inHg

7:00 AM

Mostly cloudy

68° 💧 None 💨 8 mph H 91%30.21 inHg

10:00 AM

Overcast

77° 💧 None 💨 9 mph H 76%30.24 inHg

1:00 PM

Mostly sunny

87° 💧 None 💨 6 mph H 62%30.18 inHg

4:00 PM

Mostly cloudy

91° 💧 None 💨 6 mph H 56%30.12 inHg

7:00 PM

Sunny

85° 💧 None 💨 3 mph H 66%30.09 inHg

10:00 PM

Clear night

82° 💧 None 💨 8 mph H 68%30.12 inHg

Thursday

1:00 AM

Clear night

79° 💧 None 💨 6 mph H 77%30.12 inHg

4:00 AM

Partly cloudy night

77° 💧 None 💨 6 mph H 77%30.12 inHg

7:00 AM

Partly cloudy

75° 💧 None 💨 4 mph H 81%30.15 inHg

10:00 AM

Sunny

84° 💧 None 💨 4 mph H 65%30.18 inHg

1:00 PM

Sunny

91° 💧 None 💨 5 mph H 53%30.15 inHg

4:00 PM

Light rain

91° 💧 None 💨 4 mph H 56%30.12 inHg

7:00 PM

Mostly sunny

85° 💧 None 💨 6 mph H 71%30.12 inHg

10:00 PM

Clear night

79° 💧 None 💨 7 mph H 84%30.15 inHg

Friday

1:00 AM

Clear night

75° 💧 None 💨 7 mph H 89%30.15 inHg

4:00 AM

Clear night

73° 💧 None 💨 8 mph H 91%30.15 inHg

7:00 AM

Sunny

72° 💧 None 💨 8 mph H 96%30.15 inHg

10:00 AM

Sunny

80° 💧 None 💨 7 mph H 74%30.15 inHg

1:00 PM

Sunny

90° 💧 None 💨 6 mph H 57%30.09 inHg

4:00 PM

Light rain

89° 💧 None 💨 6 mph H 57%30.00 inHg

7:00 PM

Mostly sunny

83° 💧 None 💨 2 mph H 75%29.97 inHg

10:00 PM

Light rain

72° 💧 None 💨 12 mph H 97%30.00 inHg

Saturday

1:00 AM

Clear night

73° 💧 None 💨 10 mph H 91%29.97 inHg

4:00 AM

Mostly clear night

74° 💧 None 💨 11 mph H 86%29.91 inHg

7:00 AM

Overcast

74° 💧 None 💨 7 mph H 85%29.88 inHg

1:00 PM

Mostly sunny

92° 💧 None 💨 8 mph H 42%29.85 inHg

7:00 PM

Partly cloudy

85° 💧 None 💨 4 mph H 58%29.80 inHg

Sunday

1:00 AM

Overcast night

78° 💧 None 💨 4 mph H 79%29.83 inHg

7:00 AM

Mostly cloudy

74° 💧 None 💨 6 mph H 87%29.85 inHg

1:00 PM

Sunny

93° 💧 None 💨 4 mph H 39%29.85 inHg

7:00 PM

Light rain

83° 💧 None 💨 10 mph H 60%29.83 inHg

Monday

1:00 AM

Clear night

77° 💧 None 💨 7 mph H 76%29.88 inHg

7:00 AM

Overcast

72° 💧 None 💨 4 mph H 90%29.94 inHg

1:00 PM

Overcast

89° 💧 None 💨 2 mph H 48%29.97 inHg

7:00 PM

Mostly cloudy

83° 💧 None 💨 8 mph H 66%29.97 inHg

Tuesday

1:00 AM

Mostly cloudy night

73° 💧 None 💨 7 mph H 84%30.09 inHg

7:00 AM

Overcast

69° 💧 None 💨 7 mph H 86%30.09 inHg

1:00 PM

Overcast

73° 💧 None 💨 8 mph H 89%30.15 inHg

7:00 PM

Overcast

75° 💧 None 💨 7 mph H 74%30.06 inHg

Wednesday

1:00 AM

Moderate rain

69° 💧 None 💨 6 mph H 96%30.12 inHg

7:00 AM

Overcast

66° 💧 None 💨 9 mph H 97%30.12 inHg

1:00 PM

Moderate rain

71° 💧 None 💨 7 mph H 95%30.15 inHg

7:00 PM

Overcast

73° 💧 None 💨 8 mph H 91%30.09 inHg

Thursday

1:00 AM

Overcast night

69° 💧 None 💨 8 mph H 83%30.15 inHg

7:00 AM

Overcast

68° 💧 None 💨 11 mph H 82%30.18 inHg

1:00 PM

Overcast

74° 💧 None 💨 8 mph H 69%30.21 inHg

7:00 PM

Overcast

72° 💧 None 💨 8 mph H 68%30.15 inHg

Friday

1:00 AM

Overcast night

66° 💧 None 💨 7 mph H 76%30.18 inHg

7:00 AM

Mostly cloudy

63° 💧 None 💨 8 mph H 78%30.21 inHg

1:00 PM

Partly cloudy

77° 💧 None 💨 7 mph H 63%30.18 inHg

7:00 PM

Partly cloudy night

77° 💧 None 💨 5 mph H 70%30.12 inHg

Saturday

1:00 AM

Overcast night

72° 💧 None 💨 6 mph H 78%30.12 inHg

7:00 AM

Overcast

70° 💧 None 💨 7 mph H 98%30.12 inHg

1:00 PM

Light rain

79° 💧 None 💨 7 mph H 72%30.06 inHg

7:00 PM

Light rain

70° 💧 None 💨 4 mph H 98%30.00 inHg

Sunday

1:00 AM

Mostly clear night

67° 💧 None 💨 4 mph H 99%29.97 inHg

7:00 AM

Overcast

67° 💧 None 💨 6 mph H 100%29.97 inHg

1:00 PM

Mostly sunny

78° 💧 None 💨 6 mph H 66%29.94 inHg

7:00 PM

Mostly clear night

74° 💧 None 💨 11 mph H 69%29.88 inHg

Monday

1:00 AM

Mostly clear night

62° 💧 None 💨 6 mph H 74%29.97 inHg

7:00 AM

Overcast

57° 💧 None 💨 8 mph H 81%29.97 inHg

In Mendon and, more broadly, across the state of Illinois: This evening, skies will be a mix of sun and clouds, with temperatures remaining mild between 69 and 70 degrees Fahrenheit. Light northeast winds will blow at up to 8 mph, with gusts reaching 17 mph at times. No precipitation is expected during the evening hours, providing a relatively calm night. Temperatures will stay steady, making for a pleasant evening. Be prepared for the occasional gusty breeze as the night progresses. Overall, it should be a comfortable night with partly clear skies and mild conditions.

15-Day Weather Outlook for Mendon

TomorrowTomorrow

Overcast 85°/64° 💧 None 💨 17 mph

Tuesday, Sep 15Tue Sep 15

Light thunderstorms 88°/72° 💧 None 💨 15 mph

Wednesday, Sep 16Wed Sep 16

Light rain 91°/68° 💧 0.139 in 💨 9 mph

Thursday, Sep 17Thu Sep 17

Light rain 91°/75° 💧 0.017 in 💨 7 mph

Friday, Sep 18Fri Sep 18

Light rain 90°/72° 💧 0.076 in 💨 12 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 92°/73° 💧 0.003 in 💨 11 mph

Sunday, Sep 20Sun Sep 20

Light rain 93°/74° 💧 0.032 in 💨 10 mph

Monday, Sep 21Mon Sep 21

Overcast 89°/72° 💧 0.097 in 💨 8 mph

Tuesday, Sep 22Tue Sep 22

Overcast 75°/69° 💧 0.139 in 💨 8 mph

Wednesday, Sep 23Wed Sep 23

Moderate rain 73°/66° 💧 0.663 in 💨 9 mph

Thursday, Sep 24Thu Sep 24

Overcast 74°/68° 💧 0.007 in 💨 11 mph

Friday, Sep 25Fri Sep 25

Overcast 77°/63° 💧 None 💨 8 mph

Saturday, Sep 26Sat Sep 26

Light rain 79°/70° 💧 0.480 in 💨 7 mph

Sunday, Sep 27Sun Sep 27

Mostly sunny 78°/67° 💧 0.013 in 💨 11 mph

Monday, Sep 28Mon Sep 28

Mostly sunny 62°/57° 💧 0.001 in 💨 8 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Mendon

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Mendon

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 7:00 PM

PM2.5 Fine particles Good 4,3µg/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 4,4µg/m³

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

O₃ Ozone Fair 82,8µg/m³

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

NO₂ Nitrogen dioxide Good 1,5µg/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 Mendon

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 5,2Moderate 🙂Fair

Tomorrow UV 5,5Moderate 🙂Fair

Tuesday UV 6,2High 🙂Fair

Wednesday UV 6,2High 🙂Fair

Thursday UV 5,0Moderate 🙂Fair

Friday UV 8,0Very high —Unavailable

Saturday UV 8,0Very high —Unavailable

Hourly UV index today

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.

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.

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 Mendon

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · MENDON, ILLINOIS

Tonight's Stargazing & Shooting Stars

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

58/100Best-hour score

BEST TIME TONIGHT 10:00 PM–11:00 PM Astronomical darkness: 8:49 PM–5:13 AM

☁ Cloud cover 59% Real hourly forecast for the best viewing hour.

☾ Moonlight 6% Waxing Crescent · 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 min25%

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 Mendon were last refreshed today at 6:38 PM. The current forecast period extends through 15/09/2026 at 4:00 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.