September weather forecast
Glasgow, IA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Glasgow, Iowa, with temperature in the range of an average low of 56.7°F (13.7°C) and an average high of 76.3°F (24.6°C).

Temperature

The start of September signals a gentle decrease in the average high-temperature, transitioning from a warm 81.7°F (27.6°C) in August to a still moderately hot 76.3°F (24.6°C). Nighttime temperatures consistently average a moderate 56.7°F (13.7°C) during September.

Humidity

In Glasgow, the average relative humidity in September is 75%.

Rainfall

In Glasgow, in September, during 11.5 rainfall days, 2.56" (65mm) of precipitation is typically accumulated. Throughout the year, there are 140.1 rainfall days, and 29.92" (760mm) of precipitation is accumulated.

Snowfall

In Glasgow, snow does not fall in May through September.

Daylight

In September, the average length of the day in Glasgow, Iowa, is 12h and 27min.
On the first day of September, sunrise is at 6:34 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:50 pm CDT.

Sunshine

In September, the average sunshine is 9.3h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 4 transforms into these recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

Glasgow in September has an average high-temperature of 76.3°F (24.6°C) and an average low-temperature of 56.7°F (13.7°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is estimated at 87.8°F (31°C).

What is the average humidity in September?

The average relative humidity in September is 75%.

How much does it rain in Glasgow in September?

In Glasgow, in September, it is raining for 11.5 days, with typically 2.56" (65mm) of accumulated precipitation.

When it does not snow?

In Glasgow, snow does not fall in May through September.

Does it snow in September?

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

What is the average length of the day in September?

The average day length in September in Glasgow is 12h and 27min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:34 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:50 pm CDT.

How long on average sun shines in September?

In Glasgow, the average sunshine duration in September is 9.3h.

What is the UV index intensity in September?

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

Average temperature in September - Glasgow, IA
  • Average high temperature in September: 76.3°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in September: 56.7°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

Average pressure in September
Glasgow, IA

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

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in September
Glasgow, IA

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

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).

Average humidity in September
Glasgow, IA

Average humidity in September - Glasgow, IA
  • Average humidity in September: 75%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Glasgow, IA

Average rainfall in September - Glasgow, IA
  • Average rainfall in September: 2.56"

The wettest month (with the highest rainfall) is May (4.29").
The driest months (with the least rainfall) are February and December (1.38").

Average rainfall days in September
Glasgow, IA

Average rainfall days in September - Glasgow, IA
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (4.6 days).

Average snowfall in September
Glasgow, IA

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

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

Average snowfall days in September
Glasgow, IA

Average snowfall days in September - Glasgow, 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 May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Glasgow, 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 0min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

Average sunshine days in September
Glasgow, IA

Average sunshine days in September - Glasgow, IA
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is May (10.6 days).

Average UV index in September
Glasgow, IA

Average UV index in September - Glasgow, 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
Glasgow, IA

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

The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are July, August and September (Cloud cover 31).

Average visibility in September
Glasgow, IA

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

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

Glasgow, Iowa, USA

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