Port Sanilac weather by month
What a typical year looks like in Port Sanilac, Michigan: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Lexington Water Plant, 18 km from Port Sanilac; records cover 2001–2026.
The year at a glance
- Precipitation a year
- 35.4 in898 mm
- Snow a year
- Rare
- Last spring freeze
- May 5
- First fall freeze
- Oct 22
- Heating degree days
- 7,128
- Cooling degree days
- 435
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −4°−20° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
Port Sanilac in January
Highs average 30°−1° and lows 16°−9°, with 2.6 in66 mm of precipitation in a typical January.
- Record high
- 60°16° (2008)
- Record low
- −16°−27° (2014)
- Heating degree days
- 1302
- Cooling degree days
- 0
Port Sanilac in February
Highs average 32°0° and lows 16°−9°, with 2 in51 mm of precipitation in a typical February.
- Record high
- 70°21° (2024)
- Record low
- −18°−28° (2015)
- Heating degree days
- 1145
- Cooling degree days
- 0
Port Sanilac in March
Highs average 40°5° and lows 24°−5°, with 2.1 in52 mm of precipitation in a typical March.
- Record high
- 79°26° (2007)
- Record low
- −11°−24° (2003)
- Heating degree days
- 1023
- Cooling degree days
- 0
Port Sanilac in April
Highs average 52°11° and lows 34°1°, with 3.4 in86 mm of precipitation in a typical April.
- Record high
- 87°31° (2002)
- Record low
- 15°−9° (2018)
- Heating degree days
- 671
- Cooling degree days
- 1
Port Sanilac in May
Highs average 63°17° and lows 45°7°, with 3.9 in100 mm of precipitation in a typical May.
- Record high
- 91°33° (2006)
- Record low
- 24°−4° (2020)
- Heating degree days
- 362
- Cooling degree days
- 16
Port Sanilac in June
Highs average 73°23° and lows 55°13°, with 3.7 in94 mm of precipitation in a typical June.
- Record high
- 97°36° (2012)
- Record low
- 37°3° (2009)
- Heating degree days
- 110
- Cooling degree days
- 76
Port Sanilac in July
Highs average 78°26° and lows 60°16°, with 3.2 in81 mm of precipitation in a typical July.
- Record high
- 99°37° (2012)
- Record low
- 45°7° (2007)
- Heating degree days
- 25
- Cooling degree days
- 153
Port Sanilac in August
Highs average 78°25° and lows 60°15°, with 3.1 in79 mm of precipitation in a typical August.
- Record high
- 97°36° (2006)
- Record low
- 44°7° (2025)
- Heating degree days
- 23
- Cooling degree days
- 133
Port Sanilac in September
Highs average 72°22° and lows 53°12°, with 3.3 in84 mm of precipitation in a typical September.
- Record high
- 96°36° (2013)
- Record low
- 34°1° (2020)
- Heating degree days
- 132
- Cooling degree days
- 51
Port Sanilac in OctoberThis month
Highs average 59°15° and lows 42°6°, with 3.3 in85 mm of precipitation in a typical October.
- Record high
- 90°32° (2007)
- Record low
- 23°−5° (2020)
- Heating degree days
- 453
- Cooling degree days
- 5
Port Sanilac in November
Highs average 47°8° and lows 32°0°, with 2.5 in64 mm of precipitation in a typical November.
- Record high
- 75°24° (2016)
- Record low
- 8°−13° (2019)
- Heating degree days
- 772
- Cooling degree days
- 0
Port Sanilac in December
Highs average 35°2° and lows 23°−5°, with 2.3 in58 mm of precipitation in a typical December.
- Record high
- 67°19° (2001)
- Record low
- −8°−22° (2017)
- Heating degree days
- 1110
- Cooling degree days
- 0