September weather forecastPort Huron, MI
September
Weather in September
September in Port Huron marks the beginning of autumn. There's a significant drop in temperature, descending to a high of 71.2°F (21.8°C). This period is characterized by a balance between the fading summer warmth and the steadily creeping in autumn chills. As leaves start changing color, the city turns into an autumnal tapestry of russets, oranges, and yellows. The weather continues to cool as October approaches, heralding the fall season in full form.Temperature
With the arrival of September, Port Huron experiences a modest decline in average high-temperatures, transitioning from a warm 77.5°F (25.3°C) in August to a pleasant 71.2°F (21.8°C). An average low-temperature of 55.2°F (12.9°C) is noted during the month of September.Humidity
In September, the average relative humidity in Port Huron is 78%.Rainfall
In Port Huron, in September, during 12.4 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. Throughout the year, there are 140.4 rainfall days, and 19.41" (493mm) of precipitation is accumulated.Snowfall
In Port Huron, snow does not fall in June through September.Ocean temperature
In September, the average ocean temperature is 69.4°F (20.8°C).Note: The majority of people find swimming in 69.4°F (20.8°C) unenjoyable. As the water temperature decreases from 69.8°F (21°C) to 59°F (15°C), breathing becomes more challenging to control.
Daylight
In Port Huron, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:55 am and sunset at 8:03 pm. On the last day of September, sunrise is at 7:26 am and sunset at 7:12 pm EDT.
Sunshine
In Port Huron, the average sunshine in September is 8.2h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The average daily UV index of 3 in September transforms into the following instructions:
Undertake protective steps - Preventing sun damage is advised. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Port Huron, MI
- Average high temperature in September: 71.2°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in September
Port Huron, MI
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Port Huron, MI
- Average wind speed in September: 7.9mph
The windiest month (with the highest average wind speed) is January (11.3mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).
Average humidity in September
Port Huron, MI
- Average humidity in September: 78%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April and May (76%).
Average rainfall in September
Port Huron, MI
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is February (1.1").
Average rainfall days in September
Port Huron, MI
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in September
Port Huron, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.9").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Port Huron, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Port Huron, MI
- Average sea temperature in September: 69.4°F
The best month for swimming (with the highest average sea temperature) is August (73.7°F).
The coldest month (with the lowest average sea temperature) is February (32.4°F).
Average daylight in September /
Average sunshine in September
Port Huron, MI
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in September
Port Huron, MI
- Average sunshine days in September: 15 days
The month with the most sunshine days is November (15.2 days).
The month with the least sunshine days is February (11.3 days).
Average UV index in September
Port Huron, MI
- Average UV index in September: 3
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Port Huron, MI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Port Huron, MI
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
