September weather forecast
Brookdale, IA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Brookdale, Iowa, with an average temperature fluctuating between 76.1°F (24.5°C) and 55°F (12.8°C).

Temperature

September is marked by a subtle drop in average high-temperatures, transitioning from a moderately hot 82°F (27.8°C) in August to a still warm 76.1°F (24.5°C). The average low-temperature of 55°F (12.8°C) is witnessed in Brookdale during September.

Humidity

In Brookdale, the average relative humidity in September is 70%.

Rainfall

In September, the rain falls for 11.8 days. Throughout September, 1.93" (49mm) of precipitation is accumulated. In Brookdale, Iowa, during the entire year, the rain falls for 122 days and collects up to 21.61" (549mm) of precipitation.

Snowfall

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

Daylight

In Brookdale, Iowa, the average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:51 am and sunset at 7:59 pm. On the last day of September, in Brookdale, sunrise is at 7:22 am and sunset at 7:08 pm CDT.

Sunshine

In Brookdale, the average sunshine in September is 8.8h.

UV index

In September, the average daily maximum UV index in Brookdale is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: A typical high UV index of 5 in September suggests the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures in Brookdale?

The high-temperature in Brookdale during September is 76.1°F (24.5°C) and the low-temperature is 55°F (12.8°C). In August, the average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, is appraised at 87.8°F (31°C).

What is the average humidity in September in Brookdale?

The average relative humidity in September in Brookdale is 70%.

How many days does it rain in September in Brookdale?

In Brookdale, in September, during 11.8 rainfall days, 1.93" (49mm) of precipitation is typically accumulated.

When it does not snow in Brookdale?

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

Does it snow in Brookdale in September?

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

What is the average length of the day in September in Brookdale?

In Brookdale, the average day length in September is 12h and 28min.

What time are sunrise and sunset in September in Brookdale?

On the first day of September in Brookdale, Iowa, sunrise is at 6:51 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:08 pm CDT.

How long on average sun shines in September in Brookdale?

The average sunshine duration in September in Brookdale is 8.8h.

What is the UV index reading in September in Brookdale?

In September, the average daily maximum UV index in Brookdale, Iowa, is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health 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
Brookdale, IA

Average temperature in September - Brookdale, IA
  • Average high temperature in September: 76.1°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (27°F).

  • Average low temperature in September: 55°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).

Average pressure in September
Brookdale, IA

Average pressure in September - Brookdale, IA
  • Average pressure in September: 29.98"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

Average wind speed in September
Brookdale, IA

Average wind speed in September - Brookdale, IA
  • Average wind speed in September: 9mph

The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.6mph).

Average humidity in September
Brookdale, IA

Average humidity in September - Brookdale, IA
  • Average humidity in September: 70%

The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (65%).

Average rainfall in September
Brookdale, IA

Average rainfall in September - Brookdale, IA
  • Average rainfall in September: 1.93"

The wettest months (with the highest rainfall) are May and June (3.03").
The driest month (with the least rainfall) is February (0.67").

Average rainfall days in September
Brookdale, IA

Average rainfall days in September - Brookdale, IA
  • Average rainfall days in September: 11.8 days

The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3.3 days).

Average snowfall in September
Brookdale, IA

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

The month with the highest snowfall is January (2.95").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Brookdale, IA

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

The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Brookdale, IA
  • 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: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in September
Brookdale, IA

Average sunshine days in September - Brookdale, IA
  • Average sunshine days in September: 16.4 days

The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is June (9.7 days).

Average UV index in September
Brookdale, IA

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

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

Average cloud cover in September
Brookdale, IA

Average cloud cover in September - Brookdale, IA
  • Average cloud cover in September: 28

The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 26).

Average visibility in September
Brookdale, IA

Average visibility in September - Brookdale, 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).

Brookdale, Iowa, USA

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