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
Hartley's transition into September involves a gentle shift in temperature, receding from a moderately hot 74.1°F (23.4°C) in August to a refreshing 66.2°F (19°C). September brings an average low-temperature of 49.3°F (9.6°C) to Hartley.Humidity
In September, the average relative humidity is 79%.Rainfall
In Hartley, during September, the rain falls for 14 days and regularly aggregates up to 1.93" (49mm) of precipitation. Throughout the year, there are 112.5 rainfall days, and 22.68" (576mm) of precipitation is accumulated.Snowfall
In Hartley, snow does not fall in June through September.Daylight
In Hartley, the average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:37 pm. On the last day of September, in Hartley, sunrise is at 6:57 am and sunset at 6:40 pm CDT.
Sunshine
In September, the average sunshine is 7.7h.UV index
In Hartley, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: During September, 3 as the daily maximum UV index converts into the following advice:
Ensure safety - Sun damage prevention is strongly urged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Hartley have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Hartley, MI
- Average high temperature in September: 66.2°F
The warmest month (with the highest average high temperature) is July (76.5°F).
The month with the lowest average high temperature is January (19.2°F).
- Average low temperature in September: 49.3°F
The month with the highest average low temperature is July (56.5°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).
Average pressure in September
Hartley, MI
- Average pressure in September: 30"Hg
The months with the highest atmospheric pressure are February and March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Hartley, MI
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest months (with the lowest average wind speed) are June, July and August (7.1mph).
Average humidity in September
Hartley, MI
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is May (71%).
Average rainfall in September
Hartley, MI
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is April (2.52").
The driest month (with the least rainfall) is February (1.06").
Average rainfall days in September
Hartley, MI
- Average rainfall days in September: 14 days
The month with the highest number of rainy days is August (14.4 days).
The month with the least rainy days is February (1.5 days).
Average snowfall in September
Hartley, MI
- Average snowfall in September: 0"
The month with the highest snowfall is December (10.63").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Hartley, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (23.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Hartley, MI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 7h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 1h and 30min).
Average sunshine days in September
Hartley, MI
- Average sunshine days in September: 14.6 days
The month with the most sunshine days is July (15.5 days).
The month with the least sunshine days is January (7.4 days).
Average UV index in September
Hartley, MI
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Hartley, MI
- Average cloud cover in September: 44
The month with the most cloud cover is January (Cloud cover 85).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in September
Hartley, MI
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, September and October (6mi).
The months with the lowest visibility are January and February (4mi).
Hartley, Michigan, USA
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