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Current weather in Mason is clear sky.

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

Now · 10:09 AM

Mason Weather & Hourly Forecast

United States · Illinois · 62443

84°F

Sunny

Feels like: 87°F

💧 Humidity 58% 🌡 Pressure 30.09 inHg 💨 Wind 7 mph 👁 Visibility 21.4 mi ☁ Clouds 0% ☀️ UV index 3.2 · Moderate 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Mason

Today

11:00 AM

Sunny

89° 💧 None 💨 9 mph H 54%30.09 inHg

2:00 PM

Partly cloudy

96° 💧 0.026 in 💨 9 mph H 41%30.06 inHg

5:00 PM

Light rain

94° 💧 0.027 in 💨 6 mph H 48%30.03 inHg

8:00 PM

Mostly clear night

81° 💧 None 💨 6 mph H 73%30.06 inHg

11:00 PM

Clear night

79° 💧 None 💨 5 mph H 81%30.12 inHg

Tomorrow

2:00 AM

Clear night

78° 💧 None 💨 5 mph H 81%30.12 inHg

5:00 AM

Clear night

77° 💧 0.014 in 💨 4 mph H 80%30.15 inHg

8:00 AM

Light rain

74° 💧 0.031 in 💨 7 mph H 95%30.21 inHg

11:00 AM

Mostly sunny

88° 💧 0.000 in 💨 6 mph H 58%30.24 inHg

2:00 PM

Sunny

96° 💧 0.001 in 💨 7 mph H 42%30.21 inHg

5:00 PM

Light rain

92° 💧 0.041 in 💨 6 mph H 49%30.12 inHg

8:00 PM

Clear night

82° 💧 None 💨 4 mph H 74%30.15 inHg

11:00 PM

Clear night

81° 💧 None 💨 6 mph H 63%30.21 inHg

Thursday

2:00 AM

Clear night

79° 💧 None 💨 6 mph H 68%30.18 inHg

5:00 AM

Clear night

78° 💧 None 💨 7 mph H 70%30.18 inHg

8:00 AM

Sunny

81° 💧 None 💨 7 mph H 65%30.21 inHg

Today

11:00 AM

Sunny

89° 💧 None 💨 9 mph H 54%30.09 inHg

12:00 PM

Sunny

92° 💧 None 💨 9 mph H 49%30.06 inHg

1:00 PM

Partly cloudy

94° 💧 None 💨 9 mph H 45%30.06 inHg

2:00 PM

Partly cloudy

96° 💧 None 💨 9 mph H 41%30.06 inHg

3:00 PM

Partly cloudy

96° 💧 0.000 in 💨 8 mph H 40%30.03 inHg

4:00 PM

Light rain

94° 💧 0.026 in 💨 8 mph H 47%30.03 inHg

5:00 PM

Light rain

94° 💧 0.013 in 💨 6 mph H 48%30.03 inHg

6:00 PM

Light thunderstorms

86° 💧 0.012 in 💨 11 mph H 63%30.06 inHg

7:00 PM

Sunny

82° 💧 0.002 in 💨 5 mph H 71%30.06 inHg

8:00 PM

Mostly clear night

81° 💧 None 💨 6 mph H 73%30.06 inHg

9:00 PM

Clear night

81° 💧 None 💨 6 mph H 75%30.09 inHg

10:00 PM

Clear night

80° 💧 None 💨 5 mph H 79%30.12 inHg

11:00 PM

Clear night

79° 💧 None 💨 5 mph H 81%30.12 inHg

Tomorrow

12:00 AM

Clear night

79° 💧 None 💨 5 mph H 81%30.12 inHg

1:00 AM

Clear night

79° 💧 None 💨 5 mph H 81%30.12 inHg

2:00 AM

Clear night

78° 💧 None 💨 5 mph H 81%30.12 inHg

3:00 AM

Clear night

78° 💧 None 💨 5 mph H 81%30.12 inHg

4:00 AM

Clear night

77° 💧 None 💨 5 mph H 80%30.12 inHg

5:00 AM

Clear night

77° 💧 None 💨 4 mph H 80%30.15 inHg

6:00 AM

Mostly clear night

76° 💧 0.000 in 💨 2 mph H 81%30.18 inHg

7:00 AM

Light rain

74° 💧 0.014 in 💨 7 mph H 88%30.21 inHg

8:00 AM

Light rain

74° 💧 0.027 in 💨 7 mph H 95%30.21 inHg

9:00 AM

Mostly sunny

79° 💧 0.003 in 💨 5 mph H 88%30.24 inHg

10:00 AM

Mostly sunny

84° 💧 0.001 in 💨 6 mph H 69%30.24 inHg

11:00 AM

Mostly sunny

88° 💧 0.000 in 💨 6 mph H 58%30.24 inHg

12:00 PM

Sunny

91° 💧 None 💨 6 mph H 51%30.24 inHg

1:00 PM

Strong thunderstorm

94° 💧 0.000 in 💨 7 mph H 45%30.21 inHg

2:00 PM

Sunny

96° 💧 None 💨 7 mph H 42%30.21 inHg

3:00 PM

Sunny

96° 💧 0.000 in 💨 6 mph H 41%30.18 inHg

4:00 PM

Mostly sunny

96° 💧 0.000 in 💨 6 mph H 41%30.15 inHg

5:00 PM

Light rain

92° 💧 0.029 in 💨 6 mph H 49%30.12 inHg

6:00 PM

Light rain

88° 💧 0.010 in 💨 5 mph H 62%30.15 inHg

7:00 PM

Mostly sunny

84° 💧 0.002 in 💨 2 mph H 71%30.15 inHg

8:00 PM

Clear night

82° 💧 None 💨 4 mph H 74%30.15 inHg

9:00 PM

Clear night

82° 💧 None 💨 5 mph H 73%30.18 inHg

10:00 PM

Clear night

82° 💧 None 💨 5 mph H 68%30.21 inHg

11:00 PM

Clear night

81° 💧 None 💨 6 mph H 63%30.21 inHg

Thursday

12:00 AM

Clear night

81° 💧 None 💨 7 mph H 64%30.21 inHg

1:00 AM

Clear night

80° 💧 None 💨 6 mph H 66%30.18 inHg

2:00 AM

Clear night

79° 💧 None 💨 6 mph H 68%30.18 inHg

3:00 AM

Clear night

78° 💧 None 💨 6 mph H 70%30.18 inHg

4:00 AM

Clear night

78° 💧 None 💨 7 mph H 70%30.18 inHg

5:00 AM

Clear night

78° 💧 None 💨 7 mph H 70%30.18 inHg

6:00 AM

Clear night

77° 💧 None 💨 7 mph H 71%30.21 inHg

7:00 AM

Sunny

77° 💧 None 💨 7 mph H 71%30.21 inHg

8:00 AM

Sunny

81° 💧 None 💨 7 mph H 65%30.21 inHg

9:00 AM

Sunny

85° 💧 None 💨 7 mph H 57%30.21 inHg

10:00 AM

Sunny

89° 💧 None 💨 8 mph H 50%30.24 inHg

11:00 AM

Sunny

93° 💧 None 💨 8 mph H 44%30.21 inHg

12:00 PM

Sunny

95° 💧 None 💨 9 mph H 41%30.18 inHg

1:00 PM

Strong thunderstorm

97° 💧 None 💨 8 mph H 37%30.18 inHg

2:00 PM

Sunny

98° 💧 None 💨 7 mph H 36%30.15 inHg

3:00 PM

Sunny

98° 💧 0.000 in 💨 7 mph H 36%30.12 inHg

4:00 PM

Partly cloudy

97° 💧 0.000 in 💨 6 mph H 37%30.09 inHg

5:00 PM

Light thunderstorms

94° 💧 0.006 in 💨 6 mph H 43%30.09 inHg

6:00 PM

Light rain

92° 💧 0.010 in 💨 5 mph H 48%30.09 inHg

7:00 PM

Partly cloudy

88° 💧 None 💨 3 mph H 56%30.12 inHg

Friday

4:00 AM

Clear night

76° 💧 None 💨 7 mph H 92%30.15 inHg

7:00 AM

Mostly sunny

73° 💧 None 💨 8 mph H 91%30.18 inHg

10:00 AM

Sunny

82° 💧 None 💨 8 mph H 65%30.18 inHg

1:00 PM

Sunny

90° 💧 None 💨 5 mph H 53%30.12 inHg

4:00 PM

Light rain

91° 💧 None 💨 2 mph H 52%30.03 inHg

7:00 PM

Partly cloudy night

82° 💧 None 💨 8 mph H 73%30.03 inHg

10:00 PM

Clear night

79° 💧 None 💨 9 mph H 80%30.03 inHg

Saturday

1:00 AM

Clear night

76° 💧 None 💨 8 mph H 86%30.00 inHg

4:00 AM

Clear night

75° 💧 None 💨 8 mph H 89%29.97 inHg

7:00 AM

Mostly sunny

75° 💧 None 💨 9 mph H 89%29.97 inHg

10:00 AM

Mostly sunny

86° 💧 None 💨 9 mph H 56%29.97 inHg

1:00 PM

Mostly sunny

95° 💧 None 💨 9 mph H 30%29.88 inHg

4:00 PM

Overcast

94° 💧 None 💨 8 mph H 31%29.85 inHg

7:00 PM

Overcast night

88° 💧 None 💨 1 mph H 49%29.80 inHg

10:00 PM

Partly cloudy night

82° 💧 None 💨 2 mph H 59%29.85 inHg

Sunday

1:00 AM

Light rain

76° 💧 None 💨 3 mph H 79%29.88 inHg

4:00 AM

Mostly cloudy night

73° 💧 None 💨 3 mph H 87%29.83 inHg

7:00 AM

Moderate rain

71° 💧 None 💨 11 mph H 95%29.91 inHg

10:00 AM

Mostly sunny

82° 💧 None 💨 2 mph H 67%29.88 inHg

1:00 PM

Light rain

92° 💧 None 💨 1 mph H 48%29.85 inHg

4:00 PM

Light rain

76° 💧 None 💨 4 mph H 96%29.88 inHg

7:00 PM

Mostly cloudy night

76° 💧 None 💨 5 mph H 92%29.88 inHg

10:00 PM

Mostly cloudy night

75° 💧 None 💨 8 mph H 97%29.91 inHg

Monday

1:00 AM

Overcast night

73° 💧 None 💨 8 mph H 98%29.88 inHg

7:00 AM

Sunny

78° 💧 None 💨 4 mph H 69%29.83 inHg

1:00 PM

Sunny

72° 💧 None 💨 2 mph H 74%29.85 inHg

7:00 PM

Light rain

82° 💧 None 💨 12 mph H 65%29.94 inHg

Tuesday

1:00 AM

Moderate rain

75° 💧 None 💨 6 mph H 93%29.91 inHg

7:00 AM

Mostly sunny

71° 💧 None 💨 6 mph H 97%29.94 inHg

1:00 PM

Partly cloudy

68° 💧 None 💨 6 mph H 99%29.97 inHg

7:00 PM

Mostly cloudy night

78° 💧 None 💨 6 mph H 59%30.00 inHg

Wednesday

1:00 AM

Clear night

73° 💧 None 💨 6 mph H 69%29.97 inHg

7:00 AM

Sunny

65° 💧 None 💨 4 mph H 95%30.03 inHg

1:00 PM

Mostly cloudy

67° 💧 None 💨 4 mph H 96%30.06 inHg

7:00 PM

Mostly clear night

79° 💧 None 💨 7 mph H 56%30.06 inHg

Thursday

1:00 AM

Mostly clear night

73° 💧 None 💨 5 mph H 64%30.03 inHg

7:00 AM

Sunny

66° 💧 None 💨 4 mph H 86%30.06 inHg

1:00 PM

Sunny

62° 💧 None 💨 3 mph H 97%30.09 inHg

7:00 PM

Mostly clear night

79° 💧 None 💨 5 mph H 52%30.06 inHg

Friday

1:00 AM

Clear night

74° 💧 None 💨 6 mph H 58%30.00 inHg

7:00 AM

Mostly sunny

65° 💧 None 💨 6 mph H 76%30.03 inHg

1:00 PM

Partly cloudy

62° 💧 None 💨 5 mph H 87%30.06 inHg

7:00 PM

Mostly cloudy night

78° 💧 None 💨 2 mph H 54%30.03 inHg

Saturday

1:00 AM

Overcast night

74° 💧 None 💨 4 mph H 64%29.94 inHg

7:00 AM

Light rain

70° 💧 None 💨 6 mph H 76%29.94 inHg

1:00 PM

Overcast

67° 💧 None 💨 5 mph H 97%29.91 inHg

7:00 PM

Light rain

72° 💧 None 💨 3 mph H 84%29.91 inHg

Sunday

1:00 AM

Light rain

68° 💧 None 💨 7 mph H 94%29.91 inHg

7:00 AM

Sunny

63° 💧 None 💨 6 mph H 95%29.94 inHg

1:00 PM

Sunny

61° 💧 None 💨 6 mph H 97%30.00 inHg

7:00 PM

Light rain

75° 💧 None 💨 9 mph H 61%30.03 inHg

Monday

1:00 AM

Clear night

70° 💧 None 💨 9 mph H 66%30.03 inHg

7:00 AM

Sunny

62° 💧 None 💨 9 mph H 68%30.12 inHg

1:00 PM

Sunny

56° 💧 None 💨 8 mph H 86%30.15 inHg

7:00 PM

Clear night

72° 💧 None 💨 9 mph H 48%30.15 inHg

Tuesday

1:00 AM

Clear night

65° 💧 None 💨 5 mph H 62%30.09 inHg

7:00 AM

Partly cloudy

59° 💧 None 💨 9 mph H 75%30.12 inHg

1:00 PM

Overcast

55° 💧 None 💨 9 mph H 73%30.15 inHg

7:00 PM

Overcast night

71° 💧 None 💨 10 mph H 51%30.12 inHg

Wednesday

1:00 AM

Overcast night

68° 💧 None 💨 8 mph H 58%30.09 inHg

In Mason and, more broadly, across the state of Illinois: This morning will start with a mix of sun and clouds, with temperatures rising into the mid to upper 60s. Expect warm conditions to continue into the afternoon, with highs reaching around 88 degrees. There is a potential for light rain later in the day, with an accumulation of about 0.04 inches, and the chance of rain is high. Winds will be moderate from the south at up to 15 mph, with gusts reaching around 39 mph. Be prepared for possible brief showers and gusty conditions as the day progresses.

15-Day Weather Outlook for Mason

TomorrowTomorrow

Strong thunderstorm 96°/74° 💧 None 💨 7 mph

Thursday, Sep 17Thu Sep 17

Strong thunderstorm 98°/77° 💧 None 💨 9 mph

Friday, Sep 18Fri Sep 18

Light rain 91°/73° 💧 0.183 in 💨 9 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 95°/75° 💧 None 💨 9 mph

Sunday, Sep 20Sun Sep 20

Moderate rain 92°/71° 💧 0.402 in 💨 11 mph

Monday, Sep 21Mon Sep 21

Light rain 82°/72° 💧 0.031 in 💨 12 mph

Tuesday, Sep 22Tue Sep 22

Moderate rain 78°/68° 💧 0.476 in 💨 6 mph

Wednesday, Sep 23Wed Sep 23

Mostly sunny 79°/65° 💧 0.006 in 💨 7 mph

Thursday, Sep 24Thu Sep 24

Mostly sunny 79°/62° 💧 0.001 in 💨 5 mph

Friday, Sep 25Fri Sep 25

Mostly sunny 78°/62° 💧 None 💨 6 mph

Saturday, Sep 26Sat Sep 26

Light rain 74°/67° 💧 0.659 in 💨 6 mph

Sunday, Sep 27Sun Sep 27

Light rain 75°/61° 💧 0.138 in 💨 9 mph

Monday, Sep 28Mon Sep 28

Sunny 72°/56° 💧 0.035 in 💨 9 mph

Tuesday, Sep 29Tue Sep 29

Partly cloudy 71°/55° 💧 None 💨 10 mph

Wednesday, Sep 30Wed Sep 30

Overcast 68°/68° 💧 None 💨 8 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Mason

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Mason

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 11:00 AM

PM2.5 Fine particles Good 7,1µg/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 8,1µg/m³

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

O₃ Ozone Fair 73,3µg/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 Mason

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 7,3High 🙂Fair

Tomorrow UV 7,0High 😐Moderate

Thursday UV 9,0Very high 🙂Fair

Friday UV 9,0Very high 🙂Fair

Saturday UV 9,0Very high 🙂Fair

Sunday UV 8,0Very high —Unavailable

Monday UV 8,0Very high —Unavailable

Hourly UV index today

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

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · MASON, ILLINOIS

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 2:00 AM–3:00 AM.

99/100Best-hour score

BEST TIME TONIGHT 2:00 AM–3:00 AM Astronomical darkness: 8:33 PM–5:06 AM

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

☾ Moonlight 21% Waxing Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 62° high at the best hour.

✦ Estimated visible meteors 2–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min77%

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 Mason were last refreshed today at 10:08 AM. The current forecast period extends through 17/09/2026 at 8:00 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.