Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With the onset of September, Petersburg's average high-temperature slightly adjusts, moderately receding from August's moderately hot 78.4°F (25.8°C) to an agreeable 72.9°F (22.7°C). Throughout the month of September, the nighttime temperature dips to an average of 55.8°F (13.2°C).Humidity
In September, the average relative humidity is 78%.Rainfall
In Petersburg, in September, during 11.7 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. Throughout the year, there are 132.8 rainfall days, and 16.18" (411mm) of precipitation is accumulated.Snowfall
In Petersburg, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 7:01 am and sunset at 8:07 pm. On the last day of September, sunrise is at 7:31 am and sunset at 7:17 pm EDT.
Sunshine
The average sunshine in September is 8h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: In September, the maximum UV index of 4 translates into these guidelines:
Exercise prevention - Warding off sunburn is urged. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Petersburg, MI
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in September: 55.8°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in September
Petersburg, MI
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Petersburg, MI
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).
Average humidity in September
Petersburg, MI
- Average humidity in September: 78%
The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Petersburg, MI
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is June (2.13").
The driest month (with the least rainfall) is December (0.71").
Average rainfall days in September
Petersburg, MI
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in September
Petersburg, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.44").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Petersburg, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Petersburg, MI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in September
Petersburg, MI
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is October (17.3 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in September
Petersburg, MI
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Petersburg, MI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Petersburg, 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).
Petersburg, Michigan, USA
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