September weather forecast
Garden Grove, IA

Share

Weather in September

The first month of the autumn, September, is still a warm month in Garden Grove, Iowa, with an average temperature ranging between max 76.1°F (24.5°C) and min 56.3°F (13.5°C).

Temperature

September is marked by a subtle drop in average high-temperatures, transitioning from 81.9°F (27.7°C) in August to a still moderately hot 76.1°F (24.5°C). During the September nights, an average temperature of 56.3°F (13.5°C) is observed.

Humidity

The average relative humidity in September is 77%.

Rainfall

In Garden Grove, during September, the rain falls for 11.5 days and regularly aggregates up to 2.24" (57mm) of precipitation. In Garden Grove, during the entire year, the rain falls for 132.4 days and collects up to 20.24" (514mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in September is 12h and 27min.
On the first day of September, sunrise is at 6:42 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:57 pm CDT.

Sunshine

In Garden Grove, the average sunshine in September is 9.4h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In September, the UV index of 4 transforms into the following advice:
Guard yourself - An obligation to protect skin and eyes from harm exists. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Updated: Jul 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

September temperatures vary between a high-temperature of 76.1°F (24.5°C) and a low-temperature of 56.3°F (13.5°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is computed to be 87.8°F (31°C).

What is the average humidity in September?

The average relative humidity in September is 77%.

How much does it rain in September?

In Garden Grove, in September, during 11.5 rainfall days, 2.24" (57mm) of precipitation is typically accumulated.

When it does not snow?

In Garden Grove, snow does not fall in June through September.

Does it snow in September?

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

What is the average length of the day in September?

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

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:42 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:57 pm CDT.

How many hours of sunshine does Garden Grove have in September?

In September, the average sunshine duration is 9.4h.

What is the UV index intensity in September?

In Garden Grove, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes 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
Garden Grove, IA

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

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in September: 56.3°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).

Average pressure in September
Garden Grove, IA

Average pressure in September - Garden Grove, 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 (29.89"Hg).

Average wind speed in September
Garden Grove, IA

Average wind speed in September - Garden Grove, IA
  • Average wind speed in September: 7.9mph

The windiest months (with the highest average wind speed) are January, February and March (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).

Average humidity in September
Garden Grove, IA

Average humidity in September - Garden Grove, IA
  • Average humidity in September: 77%

The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).

Average rainfall in September
Garden Grove, IA

Average rainfall in September - Garden Grove, IA
  • Average rainfall in September: 2.24"

The wettest month (with the highest rainfall) is June (3.43").
The driest months (with the least rainfall) are January and December (0.67").

Average rainfall days in September
Garden Grove, IA

Average rainfall days in September - Garden Grove, IA
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is January (4.8 days).

Average snowfall in September
Garden Grove, IA

Average snowfall in September - Garden Grove, IA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.72").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Garden Grove, IA

Average snowfall days in September - Garden Grove, IA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Garden Grove, IA

Average daylight in September / Average sunshine in September - Garden Grove, 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 2min

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

Average sunshine days in September
Garden Grove, IA

Average sunshine days in September - Garden Grove, IA
  • Average sunshine days in September: 16 days

The month with the most sunshine days is December (20.3 days).
The month with the least sunshine days is June (8.9 days).

Average UV index in September
Garden Grove, IA

Average UV index in September - Garden Grove, IA
  • Average UV index in September: 4

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
Garden Grove, IA

Average cloud cover in September - Garden Grove, IA
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in September
Garden Grove, IA

Average visibility in September - Garden Grove, 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).

Garden Grove, Iowa, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location