As of 09:06 CDT

Weather in Mason, IL

70°

Mason, Monday, 12 October, 09:06

Clear. Feels like 71°. High 89°, low 61°.

Pressure30.00 inHg

Wind6.3 mph SW

Humidity79%

Visibility6.2 mi

Dew point63°

See detailed hourly forecast

Tue, 1390° / 67°

90 °

Mason, Tuesday, 13 October

Clear. High 90°, low 67°.

Pressure29.91 inHg

Wind9.4 mph SW

Humidity51%

Visibility6.2 mi

Dew point63°

Wed, 1480° / 71°

0.22

80 °

Mason, Wednesday, 14 October

Rain. High 80°, low 71°.

Pressure30.03 inHg

Wind6.6 mph SW

Humidity70%

Visibility6.2 mi

Dew point69°

Thu, 1579° / 69°

0.57

79 °

Mason, Thursday, 15 October

Heavy rain. High 79°, low 69°.

Pressure30.03 inHg

Wind5.1 mph SW

Humidity96%

Visibility3.1 mi

Dew point73°

Fri, 1668° / 52°

0.03

68 °

Mason, Friday, 16 October

Light rain. High 68°, low 52°.

Pressure30.33 inHg

Wind18.1 mph N

Humidity43%

Visibility—

Dew point38°

Sat, 1762° / 43°

62 °

Mason, Saturday, 17 October

Clear. High 62°, low 43°.

Pressure30.50 inHg

Wind8.9 mph NE

Humidity45%

Visibility—

Dew point37°

Sun, 1867° / 40°

67 °

Mason, Sunday, 18 October

Clear. High 67°, low 40°.

Pressure30.33 inHg

Wind10.6 mph S

Humidity21%

Visibility—

Dew point20°

Mon, 1972° / 50°

72 °

Mason, Monday, 19 October

Overcast. High 72°, low 50°.

Pressure30.24 inHg

Wind12.7 mph S

Humidity53%

Visibility—

Dew point49°

Tue, 2077° / 57°

0.03

77 °

Mason, Tuesday, 20 October

Light rain. High 77°, low 57°.

Pressure30.18 inHg

Wind6.6 mph S

Humidity49%

Visibility—

Dew point54°

Wed, 2178° / 60°

0.06

78 °

Mason, Wednesday, 21 October

Light rain. High 78°, low 60°.

Pressure30.24 inHg

Wind8.5 mph SE

Humidity54%

Visibility—

Dew point57°

Thu, 2282° / 61°

82 °

Mason, Thursday, 22 October

Partly cloudy. High 82°, low 61°.

Pressure30.30 inHg

Wind12.1 mph SE

Humidity42%

Visibility—

Dew point53°

Fri, 2381° / 66°

81 °

Mason, Friday, 23 October

Overcast. High 81°, low 66°.

Pressure30.27 inHg

Wind15.7 mph SW

Humidity41%

Visibility—

Dew point52°

Sat, 2481° / 61°

81 °

Mason, Saturday, 24 October

Overcast. High 81°, low 61°.

Pressure30.06 inHg

Wind18.4 mph S

Humidity48%

Visibility—

Dew point55°

Sun, 2567° / 53°

0.07

67 °

Mason, Sunday, 25 October

Light rain. High 67°, low 53°.

Pressure30.03 inHg

Wind17.9 mph W

Humidity51%

Visibility—

Dew point46°

Mon, 2662° / 46°

62 °

Mason, Monday, 26 October

Overcast. High 62°, low 46°.

Pressure30.18 inHg

Wind15.2 mph NW

Humidity30%

Visibility—

Dew point26°

Tue, 2769° / 45°

69 °

Mason, Tuesday, 27 October

Clear. High 69°, low 45°.

Pressure29.80 inHg

Wind18.3 mph NW

Humidity36%

Visibility—

Dew point37°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Mason, IL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Mason, IL since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.