As of 01:03 EDT

Weather in South Lyon, MI

67°

South Lyon, Sunday, 9 August, 01:03

Clear. Feels like 67°. High 89°, low 65°.

Pressure30.00 inHg

Wind1 mph NW

Humidity78%

Visibility6.2 mi

Dew point59°

See detailed hourly forecast

Mon, 1087° / 71°

0.28

87 °

South Lyon, Monday, 10 August

Rain. High 87°, low 71°.

Pressure29.88 inHg

Wind9.3 mph NW

Humidity81%

Visibility6.2 mi

Dew point70°

Tue, 1172° / 65°

0.92

72 °

South Lyon, Tuesday, 11 August

Heavy rain. High 72°, low 65°.

Pressure29.85 inHg

Wind11 mph S

Humidity91%

Visibility6.2 mi

Dew point68°

Wed, 1282° / 62°

0.02

82 °

South Lyon, Wednesday, 12 August

Light rain. High 82°, low 62°.

Pressure29.80 inHg

Wind6.4 mph NW

Humidity57%

Visibility6.2 mi

Dew point61°

Thu, 1371° / 54°

71 °

South Lyon, Thursday, 13 August

Overcast. High 71°, low 54°.

Pressure30.00 inHg

Wind10.2 mph N

Humidity43%

Visibility—

Dew point44°

Fri, 1478° / 53°

78 °

South Lyon, Friday, 14 August

Clear. High 78°, low 53°.

Pressure30.09 inHg

Wind10.5 mph N

Humidity39%

Visibility—

Dew point47°

Sat, 1577° / 57°

77 °

South Lyon, Saturday, 15 August

Overcast. High 77°, low 57°.

Pressure30.27 inHg

Wind7.3 mph NE

Humidity36%

Visibility—

Dew point45°

Sun, 1679° / 57°

79 °

South Lyon, Sunday, 16 August

Partly cloudy. High 79°, low 57°.

Pressure30.15 inHg

Wind7.2 mph S

Humidity35%

Visibility—

Dew point47°

Mon, 1779° / 62°

79 °

South Lyon, Monday, 17 August

Partly cloudy. High 79°, low 62°.

Pressure30.00 inHg

Wind7.8 mph SW

Humidity50%

Visibility—

Dew point57°

Tue, 1885° / 62°

85 °

South Lyon, Tuesday, 18 August

Partly cloudy. High 85°, low 62°.

Pressure29.97 inHg

Wind11.3 mph SW

Humidity41%

Visibility—

Dew point56°

Wed, 1977° / 61°

0.06

77 °

South Lyon, Wednesday, 19 August

Light rain. High 77°, low 61°.

Pressure29.77 inHg

Wind19.8 mph W

Humidity56%

Visibility—

Dew point59°

Thu, 2077° / 60°

77 °

South Lyon, Thursday, 20 August

Overcast. High 77°, low 60°.

Pressure29.91 inHg

Wind15.5 mph NW

Humidity45%

Visibility—

Dew point50°

Fri, 2177° / 51°

77 °

South Lyon, Friday, 21 August

Clear. High 77°, low 51°.

Pressure30.06 inHg

Wind7.7 mph N

Humidity28%

Visibility—

Dew point37°

Sat, 2276° / 55°

0.01

76 °

South Lyon, Saturday, 22 August

Light rain. High 76°, low 55°.

Pressure29.94 inHg

Wind12.3 mph SE

Humidity35%

Visibility—

Dew point44°

Sun, 2385° / 61°

85 °

South Lyon, Sunday, 23 August

Partly cloudy. High 85°, low 61°.

Pressure29.80 inHg

Wind21.8 mph W

Humidity46%

Visibility—

Dew point59°

Mon, 2481° / 57°

81 °

South Lyon, Monday, 24 August

Partly cloudy. High 81°, low 57°.

Pressure30.00 inHg

Wind10.2 mph NW

Humidity34%

Visibility—

Dew point47°

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 South Lyon, MI 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 South Lyon, MI 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.