September weather forecast
Williamston, MI

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Weather in September

The first month of the autumn, September, is still a pleasant month in Williamston, Michigan, with an average temperature varying between 52.9°F (11.6°C) and 71.2°F (21.8°C).

Temperature

The commencement of September includes a gentle temperature shift, with the average high-temperature dropping a bit from a moderately hot 77.5°F (25.3°C) in August to an agreeable 71.2°F (21.8°C). In the month of September, Williamston's average low-temperature falls to a fresh 52.9°F (11.6°C).

Humidity

The average relative humidity in September is 80%.

Rainfall

In September, the rain falls for 12.6 days. Throughout September, 1.77" (45mm) of precipitation is accumulated. Throughout the year, there are 150.4 rainfall days, and 24.65" (626mm) of precipitation is accumulated.

Snowfall

In Williamston, Michigan, snow does not fall in June through September.

Daylight

In September, the average length of the day is 12h and 29min.
On the first day of September in Williamston, Michigan, sunrise is at 7:02 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 7:19 pm EDT.

Sunshine

In September, the average sunshine is 7.9h.

UV index

The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 3 translates into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Resources | Updated: Feb 12, 2024 | Published by: Weather U.S.

Frequently asked questions

What are September temperatures in Williamston?

In Williamston, 71.2°F (21.8°C) is the average high-temperature and 52.9°F (11.6°C) is the average low-temperature during September.

What is the average humidity in September in Williamston?

In September, the average relative humidity in Williamston, Michigan, is 80%.

How much does it rain in Williamston in September?

In September, in Williamston, the rain falls for 12.6 days. Throughout September, 1.77" (45mm) of precipitation is accumulated.

When it does not snow in Williamston?

In Williamston, snow does not fall in June through September.

Does it snow in Williamston in September?

In Williamston, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Williamston have in September?

The average day length in September is 12h and 29min.

When is the sunrise / sunset in September in Williamston?

On the first day of September, sunrise is at 7:02 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 7:19 pm EDT.

How many hours of sunshine does Williamston have in September?

In Williamston, Michigan, the average sunshine duration in September is 7.9h.

How high is the UV index in September in Williamston?

The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Williamston, MI

Average temperature in September - Williamston, MI
  • Average high temperature in September: 71.2°F

The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (27.7°F).

  • Average low temperature in September: 52.9°F

The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

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Average pressure in September
Williamston, MI

Average pressure in September - Williamston, MI
  • Average pressure in September: 30.03"Hg

The months with the highest atmospheric pressure are March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Williamston, MI

Average wind speed in September - Williamston, MI
  • Average wind speed in September: 7.2mph

The windiest months (with the highest average wind speed) are January and February (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

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Average humidity in September
Williamston, MI

Average humidity in September - Williamston, MI
  • Average humidity in September: 80%

The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is April (77%).

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Average rainfall in September
Williamston, MI

Average rainfall in September - Williamston, MI
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is May (2.99").
The driest month (with the least rainfall) is December (1.42").

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Average rainfall days in September
Williamston, MI

Average rainfall days in September - Williamston, MI
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (6.2 days).

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Average snowfall in September
Williamston, MI

Average snowfall in September - Williamston, MI
  • Average snowfall in September: 0"

The month with the highest snowfall is February (5.51").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Williamston, MI

Average snowfall days in September - Williamston, MI
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (17.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Williamston, MI

Average daylight in September / Average sunshine in September - Williamston, MI
  • Average daylight in September: 12h and 3min

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: 7h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 2h and 42min).

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Average sunshine days in September
Williamston, MI

Average sunshine days in September - Williamston, MI
  • Average sunshine days in September: 15.6 days

The month with the most sunshine days is September (15.6 days).
The month with the least sunshine days is February (8.6 days).

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Average UV index in September
Williamston, MI

Average UV index in September - Williamston, MI
  • Average UV index in September: 3

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in September
Williamston, MI

Average cloud cover in September - Williamston, MI
  • Average cloud cover in September: 36

The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in September
Williamston, MI

Average visibility in September - Williamston, MI
  • Average visibility in September: 5mi

The months with the highest visibility are March, April, May, June, July, October and November (6mi).
The months with the lowest visibility are January, February, August, September and December (5mi).

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Williamston, Michigan, USA

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