September weather forecast
Quincy, IA

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Weather in September

September, the first month of the autumn in Quincy, is still a warm month, with an average temperature varying between 56.1°F (13.4°C) and 75.6°F (24.2°C).

Temperature

The beginning of September brings a slight decrease in the average high-temperature, transitioning from 81.1°F (27.3°C) in August to a still warm 75.6°F (24.2°C). Quincy, during the month of September, experiences an average low-temperature of 56.1°F (13.4°C).

Humidity

The average relative humidity in September is 76%.

Rainfall

In Quincy, in September, it is raining for 10.4 days, with typically 1.5" (38mm) of accumulated precipitation. In Quincy, during the entire year, the rain falls for 115.1 days and collects up to 19.21" (488mm) of precipitation.

Snowfall

In Quincy, snow does not fall in May through September.

Daylight

In Quincy, the average length of the day in September is 12h and 27min.
On the first day of September, sunrise is at 6:46 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:02 pm CDT.

Sunshine

In Quincy, the average sunshine in September is 9.2h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum daily UV index of 5 during September morphs into the following directions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Updated: Aug 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September in Quincy?

September temperatures vary between a high-temperature of 75.6°F (24.2°C) and a low-temperature of 56.1°F (13.4°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines air temperature and relative humidity, is estimated at 86°F (30°C).

What is the average humidity in September?

In Quincy, the average relative humidity in September is 76%.

How much does it rain in September?

In September, the rain falls for 10.4 days. Throughout September, 1.5" (38mm) of precipitation is accumulated.

When it does not snow?

In Quincy, snow does not fall in May through September.

Does it snow in September?

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

How many hours of daylight does Quincy have in September?

In September, the average day length is 12h and 27min.

What time are sunrise and sunset in September in Quincy?

In September, on the first day of the month, sunrise is at 6:46 am and sunset at 7:51 pm. On the last day of the month, in Quincy, sunrise is at 7:15 am and sunset at 7:02 pm CDT.

How many hours of sunshine does Quincy have in September?

In September, the average sunshine duration is 9.2h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
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
Quincy, IA

Average temperature in September - Quincy, IA
  • Average high temperature in September: 75.6°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (29.3°F).

  • Average low temperature in September: 56.1°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (16°F).

Average pressure in September
Quincy, IA

Average pressure in September - Quincy, IA
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in September
Quincy, IA

Average wind speed in September - Quincy, IA
  • Average wind speed in September: 8.2mph

The windiest months (with the highest average wind speed) are March and April (10.5mph).
The calmest month (with the lowest average wind speed) is July (7mph).

Average humidity in September
Quincy, IA

Average humidity in September - Quincy, IA
  • Average humidity in September: 76%

The months with the highest relative humidity are January and June (81%).
The month with the lowest relative humidity is October (70%).

Average rainfall in September
Quincy, IA

Average rainfall in September - Quincy, IA
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is June (3.74").
The driest month (with the least rainfall) is February (0.51").

Average rainfall days in September
Quincy, IA

Average rainfall days in September - Quincy, IA
  • Average rainfall days in September: 10.4 days

The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is February (3 days).

Average snowfall in September
Quincy, IA

Average snowfall in September - Quincy, IA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.28").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Quincy, IA

Average snowfall days in September - Quincy, IA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Quincy, IA

Average daylight in September / Average sunshine in September - Quincy, IA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in September
Quincy, IA

Average sunshine days in September - Quincy, IA
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is May (12 days).

Average UV index in September
Quincy, IA

Average UV index in September - Quincy, IA
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in September
Quincy, IA

Average cloud cover in September - Quincy, IA
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July and September (Cloud cover 29).

Average visibility in September
Quincy, IA

Average visibility in September - Quincy, IA
  • 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).

Quincy, Iowa, USA

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