September weather forecast
Castle Grove, IA

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Weather in September

The first month of the autumn, September, is also an agreeable month in Castle Grove, Iowa, with temperature in the range of an average high of 73°F (22.8°C) and an average low of 54.3°F (12.4°C).

Temperature

In Castle Grove, the average high-temperature in September gently drops from a warm 78.6°F (25.9°C) in August to an agreeable 73°F (22.8°C). Castle Grove's temperature in September lowers to a consistent average of 54.3°F (12.4°C) during the nights.

Humidity

In September, the average relative humidity is 79%.

Rainfall

In September, the rain falls for 11.4 days. Throughout September, 2.52" (64mm) of precipitation is accumulated. Throughout the year, there are 142.5 rainfall days, and 28.27" (718mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In Castle Grove, the average length of the day in September is 12h and 28min.
On the first day of September, sunrise is at 6:31 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:47 pm CDT.

Sunshine

In September, the average sunshine is 9.1h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: During September, 4 as the daily maximum UV index converts into the following advice:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.

Frequently asked questions

What is the temperature in September?

In Castle Grove, 73°F (22.8°C) is the average high-temperature and 54.3°F (12.4°C) is the average low-temperature during September.

What is the average humidity in September?

The average relative humidity in September in Castle Grove is 79%.

How many days does it rain in September?

In Castle Grove, in September, it is raining for 11.4 days, with typically 2.52" (64mm) of accumulated precipitation.

When it does not snow?

In Castle Grove, snow does not fall in May through September.

Does it snow in September?

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

How many hours of daylight does Castle Grove have in September?

The average day length in September is 12h and 28min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:31 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:47 pm CDT.

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

In September, the average sunshine duration is 9.1h.

What is the UV index reading in September?

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health threat 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
Castle Grove, IA

Average temperature in September - Castle Grove, IA
  • Average high temperature in September: 73°F

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (25.2°F).

  • Average low temperature in September: 54.3°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).

Average pressure in September
Castle Grove, IA

Average pressure in September - Castle Grove, IA
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in September
Castle Grove, IA

Average wind speed in September - Castle Grove, IA
  • Average wind speed in September: 8mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).

Average humidity in September
Castle Grove, IA

Average humidity in September - Castle Grove, IA
  • Average humidity in September: 79%

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is October (74%).

Average rainfall in September
Castle Grove, IA

Average rainfall in September - Castle Grove, IA
  • Average rainfall in September: 2.52"

The wettest month (with the highest rainfall) is May (4.25").
The driest months (with the least rainfall) are January and February (1.26").

Average rainfall days in September
Castle Grove, IA

Average rainfall days in September - Castle Grove, IA
  • Average rainfall days in September: 11.4 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (5.2 days).

Average snowfall in September
Castle Grove, IA

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

The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Castle Grove, IA

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

The month with the highest number of snowfall days is January (12.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 9h and 1min

The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in September
Castle Grove, IA

Average sunshine days in September - Castle Grove, IA
  • Average sunshine days in September: 17 days

The month with the most sunshine days is September (17 days).
The month with the least sunshine days is June (10.5 days).

Average UV index in September
Castle Grove, IA

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

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

Average cloud cover in September
Castle Grove, IA

Average cloud cover in September - Castle Grove, IA
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in September
Castle Grove, IA

Average visibility in September - Castle Grove, IA
  • Average visibility in September: 6mi

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

Castle Grove, Iowa, USA

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