September weather forecast
Hartford, WI

Weather in September

September, the first month of the autumn, in Hartford, is also an agreeable month, with temperature in the range of an average low of 53.2°F (11.8°C) and an average high of 70°F (21.1°C).

Temperature

In September, the average high-temperature marginally drops, from a warm 76.6°F (24.8°C) in August, to a pleasant 70°F (21.1°C). In September, the average low-temperature is 53.2°F (11.8°C).

Humidity

In Hartford, the average relative humidity in September is 81%.

Rainfall

In Hartford, it is raining for 13 days, with typically 2.2" (56mm) of accumulated precipitation. In Hartford, during the entire year, the rain falls for 141.6 days and collects up to 25.67" (652mm) of precipitation.

Snowfall

In Hartford snow does not fall in June through September.

Daylight

In Hartford, Wisconsin, the average length of the day in September is 12.5h.

Sunshine

The average sunshine is 9h.

UV index

In September, the average daily maximum UV index in Hartford is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in September in Hartford?

In Hartford, the average relative humidity in September is 81%.

How much does it rain in Hartford in September?

In Hartford, in September, it is raining for 13 days, with typically 2.2" (56mm) of accumulated precipitation.

When it does not snow in Hartford?

June through September are months without snowfall in Hartford.

Does it snow in Hartford in September?

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

How many hours of daylight does Hartford have in September?

The average length of the day in September is 12.5h.

How many hours of sunshine does Hartford have in September?

In September, the average sunshine in Hartford is 9h.

How high is the UV index in September in Hartford?

In Hartford, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in September
Hartford, WI

Average temperature in September - Hartford, WI
  • Average high temperature in September: 70°F

The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (23.9°F).

  • Average low temperature in September: 53.2°F

The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).

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Average pressure in September
Hartford, WI

Average pressure in September - Hartford, WI
  • Average pressure in September: 30.03"

Months with the highest atmospheric pressure are January, February and March (30.09").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Hartford, WI

Average wind speed in September - Hartford, WI
  • Average wind speed in September: 7.8mph

The windiest months (with the highest average wind speed) are January and February (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

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Average humidity in September
Hartford, WI

Average humidity in September - Hartford, WI
  • Average humidity in September: 81%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (77%).

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Average rainfall in September
Hartford, WI

Average rainfall in September - Hartford, WI
  • Average rainfall in September: 2.2"

The wettest month (with the highest rainfall) is June (3.11").
The driest months (with the least rainfall) are February and December (1.18").

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Average rainfall days in September
Hartford, WI

Average rainfall days in September - Hartford, WI
  • Average rainfall days in September: 13 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is February (4.3 days).

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Average snowfall in September
Hartford, WI

Average snowfall in September - Hartford, WI
  • Average snowfall in September: 0"

The month with the highest snowfall is February (4.45").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Hartford, WI

Average snowfall days in September - Hartford, WI
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (15.1 days).
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
Hartford, WI

Average daylight in September / Average sunshine in September - Hartford, WI
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.4h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in September: 9h

The month with the most sunshine is July (Average sunshine: 10.1h).
The month with the least sunshine is January (Average sunshine: 3.3h).

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Average sunshine days in September
Hartford, WI

Average sunshine days in September - Hartford, WI
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is May (10.8 days).

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Average UV index in September
Hartford, WI

Average UV index in September - Hartford, WI
  • Average UV index in September: 3

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

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Average cloud cover in September
Hartford, WI

Average cloud cover in September - Hartford, WI
  • Average cloud cover in September: 31

The month with the most cloud cover is January (Cloud cover 64).
Months with the least cloud cover are July, August and September (Cloud cover 31).

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Average visibility in September
Hartford, WI

Average visibility in September - Hartford, WI
  • Average visibility in September: 6mi

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

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