September weather forecast
Graettinger, IA

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Weather in September

The first month of the autumn, September, is still a warm month in Graettinger, Iowa, with temperature in the range of an average high of 73.4°F (23°C) and an average low of 54.3°F (12.4°C).

Temperature

Graettinger's average high-temperature in September is a still warm 73.4°F (23°C), marking an insignificant difference from the 78.4°F (25.8°C) of August. In September, Graettinger reports a consistent average low-temperature of 54.3°F (12.4°C) during the nights.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Graettinger, Iowa, in September, during 12.9 rainfall days, 2.36" (60mm) of precipitation is typically accumulated. Throughout the year, there are 138 rainfall days, and 26.77" (680mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:44 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:16 am and sunset at 7:01 pm CDT.

Sunshine

In Graettinger, the average sunshine in September is 9.1h.

UV index

In September, the average daily maximum UV index in Graettinger is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily high UV index of 4 in September translates into this advice:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.

Frequently asked questions

What are the temperatures in September?

During September, Graettinger experiences an average high-temperature of 73.4°F (23°C) and a low-temperature of 54.3°F (12.4°C). In July, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines air temperature and relative humidity, is calculated to be 86°F (30°C).

What is the average humidity in September?

In Graettinger, the average relative humidity in September is 74%.

How many days does it rain in September?

In September, the rain falls for 12.9 days. Throughout September, 2.36" (60mm) of precipitation is accumulated.

When it does not snow?

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

Does it snow in Graettinger in September?

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

How many hours of daylight does Graettinger have in September?

In September, the average day length in Graettinger is 12h and 29min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:44 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:01 pm CDT.

How many hours of sunshine does Graettinger have in September?

The average sunshine duration in September is 9.1h.

How high is the UV index in September?

In Graettinger, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
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
Graettinger, IA

Average temperature in September - Graettinger, IA
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (23.2°F).

  • Average low temperature in September: 54.3°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (10.6°F).

Average pressure in September
Graettinger, IA

Average pressure in September - Graettinger, IA
  • Average pressure in September: 30"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
Graettinger, IA

Average wind speed in September - Graettinger, IA
  • Average wind speed in September: 8.8mph

The windiest months (with the highest average wind speed) are January and April (11mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).

Average humidity in September
Graettinger, IA

Average humidity in September - Graettinger, IA
  • Average humidity in September: 74%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (68%).

Average rainfall in September
Graettinger, IA

Average rainfall in September - Graettinger, IA
  • Average rainfall in September: 2.36"

The wettest month (with the highest rainfall) is June (4.25").
The driest month (with the least rainfall) is January (0.98").

Average rainfall days in September
Graettinger, IA

Average rainfall days in September - Graettinger, IA
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is June (20 days).
The month with the least rainy days is February (3.4 days).

Average snowfall in September
Graettinger, IA

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

The month with the highest snowfall is February (5.91").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Graettinger, IA

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

The month with the highest number of snowfall days is January (12.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Graettinger, 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 0min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

Average sunshine days in September
Graettinger, IA

Average sunshine days in September - Graettinger, IA
  • Average sunshine days in September: 14.6 days

The month with the most sunshine days is November (18 days).
The month with the least sunshine days is June (8.1 days).

Average UV index in September
Graettinger, IA

Average UV index in September - Graettinger, IA
  • Average UV index in September: 4

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

Average cloud cover in September
Graettinger, IA

Average cloud cover in September - Graettinger, IA
  • Average cloud cover in September: 31

The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are July and September (Cloud cover 31).

Average visibility in September
Graettinger, IA

Average visibility in September - Graettinger, IA
  • Average visibility in September: 6mi

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

Graettinger, Iowa, USA

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