September weather forecast
Ashton, IA

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Weather in September

September, the first month of the autumn in Ashton, is still a warm month, with an average temperature ranging between max 73.6°F (23.1°C) and min 53.8°F (12.1°C).

Temperature

Start of September brings a slight shift in the average high-temperature, dipping a bit from August's moderately hot 79.3°F (26.3°C) to a still warm 73.6°F (23.1°C). Nighttime temperatures in September average to a cool 53.8°F (12.1°C).

Humidity

The average relative humidity in September is 72%.

Rainfall

In Ashton, Iowa, during September, the rain falls for 11.9 days and regularly aggregates up to 2.17" (55mm) of precipitation. Throughout the year, there are 128.1 rainfall days, and 24.17" (614mm) of precipitation is accumulated.

Snowfall

In Ashton, 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 6:48 am and sunset at 7:57 pm. On the last day of September, sunrise is at 7:20 am and sunset at 7:05 pm CDT.

Sunshine

In September, the average sunshine in Ashton, Iowa, is 9h.

UV index

In Ashton, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily high UV index of 4 in September translates into this advice:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Updated: Jul 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

In Ashton, 73.6°F (23.1°C) is the average high-temperature and 53.8°F (12.1°C) is the average low-temperature during September. The average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in July is calculated to be 87.8°F (31°C).

What is the average humidity in September?

The average relative humidity in September is 72%.

How many days does it rain in September?

In Ashton, during September, the rain falls for 11.9 days and regularly aggregates up to 2.17" (55mm) of precipitation.

When it does not snow?

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

Does it snow in September?

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

What is the average length of the day in September?

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

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:48 am and sunset at 7:57 pm. On the last day of the month, in Ashton, Iowa, sunrise is at 7:20 am and sunset at 7:05 pm CDT.

How many hours of sunshine does Ashton have in September?

The average sunshine duration in September is 9h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unsafe 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
Ashton, IA

Average temperature in September - Ashton, IA
  • Average high temperature in September: 73.6°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (23.4°F).

  • Average low temperature in September: 53.8°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 (9.9°F).

Average pressure in September
Ashton, IA

Average pressure in September - Ashton, IA
  • Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

Average wind speed in September
Ashton, IA

Average wind speed in September - Ashton, IA
  • Average wind speed in September: 9.3mph

The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).

Average humidity in September
Ashton, IA

Average humidity in September - Ashton, IA
  • Average humidity in September: 72%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (68%).

Average rainfall in September
Ashton, IA

Average rainfall in September - Ashton, IA
  • Average rainfall in September: 2.17"

The wettest month (with the highest rainfall) is June (3.86").
The driest month (with the least rainfall) is January (0.71").

Average rainfall days in September
Ashton, IA

Average rainfall days in September - Ashton, IA
  • Average rainfall days in September: 11.9 days

The months with the highest number of rainy days are May and June (17.8 days).
The month with the least rainy days is February (2.6 days).

Average snowfall in September
Ashton, IA

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

The month with the highest snowfall is February (4.76").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Ashton, IA

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

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Ashton, 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 0min

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 6min).

Average sunshine days in September
Ashton, IA

Average sunshine days in September - Ashton, IA
  • Average sunshine days in September: 15.8 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (9.6 days).

Average UV index in September
Ashton, IA

Average UV index in September - Ashton, 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 February (UV index 1).

Average cloud cover in September
Ashton, IA

Average cloud cover in September - Ashton, IA
  • Average cloud cover in September: 30

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in September
Ashton, IA

Average visibility in September - Ashton, 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).

Ashton, Iowa, USA

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