September weather forecast
Grannis, AR

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Weather in September

September, the first month of the autumn in Grannis, is still a tropical month, with an average temperature varying between 65.5°F (18.6°C) and 86.9°F (30.5°C).

Temperature

The advent of September brings a slight shift in average high-temperature, moving from a tropical 93.2°F (34°C) in August to a still hot 86.9°F (30.5°C). An average minimum temperature of 65.5°F (18.6°C) marks the month of September.

Heat index

The average heat index in September is appraised at a torrid 96.8°F (36°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
When assessing, remember that heat index measurements are for light winds and shaded spots. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', quantifies the warmth felt when relative humidity is considered. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

In September, the average relative humidity in Grannis is 69%.

Rainfall

September is the month with the least rainfall. Rain falls for 11.1 days and accumulates 1.34" (34mm) of precipitation.

Snowfall

In Grannis, snow does not fall in April through November.

Daylight

The average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:51 am and sunset at 7:42 pm. On the last day of September, in Grannis, sunrise is at 7:11 am and sunset at 7:02 pm CDT.

Sunshine

In September, the average sunshine in Grannis is 9.4h.

UV index

In Grannis, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The UV index of 6 in September translates into these instructions:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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Frequently asked questions

Is it hot in Grannis during September?

In Grannis, 86.9°F (30.5°C) is the average high-temperature and 65.5°F (18.6°C) is the average low-temperature during September. In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is appraised at 96.8°F (36°C).

What is the average humidity in September in Grannis?

The average relative humidity in September in Grannis, Arkansas, is 69%.

What is the driest month in Grannis?

The month with the least rainfall in Grannis is September, when the rain falls for 11.1 days and typically collects 1.34" (34mm) of precipitation.

How much does it rain in Grannis in September?

In September, in Grannis, Arkansas, the rain falls for 11.1 days. Throughout September, 1.34" (34mm) of precipitation is accumulated.

When it does not snow in Grannis?

April through November are months without snowfall in Grannis.

How many hours of daylight does Grannis have in September?

In September, the average day length in Grannis, Arkansas, is 12h and 22min.

When are sunrise and sunset in September in Grannis?

On the first day of September in Grannis, sunrise is at 6:51 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 7:02 pm CDT.

How many hours of sunshine does Grannis have in September?

The average sunshine duration in September in Grannis is 9.4h.

How high is the UV index in September in Grannis?

The average daily maximum UV index in September in Grannis is 6. A UV Index reading of 6 to 7 represents a high 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
Grannis, AR

Average temperature in September - Grannis, AR
  • Average high temperature in September: 86.9°F

The warmest month (with the highest average high temperature) is July (93.4°F).
The month with the lowest average high temperature is January (51.3°F).

  • Average low temperature in September: 65.5°F

The month with the highest average low temperature is July (72°F).
The coldest month (with the lowest average low temperature) is January (34.3°F).

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Average pressure in September
Grannis, AR

Average pressure in September - Grannis, AR
  • 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 (29.93"Hg).

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Average wind speed in September
Grannis, AR

Average wind speed in September - Grannis, AR
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in September
Grannis, AR

Average humidity in September - Grannis, AR
  • Average humidity in September: 69%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (68%).

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Average rainfall in September
Grannis, AR

Average rainfall in September - Grannis, AR
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is May (3.98").
The driest month (with the least rainfall) is September (1.34").

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Average rainfall days in September
Grannis, AR

Average rainfall days in September - Grannis, AR
  • Average rainfall days in September: 11.1 days

The month with the highest number of rainy days is July (13.7 days).
The month with the least rainy days is January (8.5 days).

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Average snowfall in September
Grannis, AR

Average snowfall in September - Grannis, AR
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.51").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Grannis, AR

Average snowfall days in September - Grannis, AR
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Grannis, AR

Average daylight in September / Average sunshine in September - Grannis, AR
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).

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Average sunshine days in September
Grannis, AR

Average sunshine days in September - Grannis, AR
  • Average sunshine days in September: 16.8 days

The month with the most sunshine days is January (20.5 days).
The months with the least sunshine days are May and August (14.8 days).

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Average UV index in September
Grannis, AR

Average UV index in September - Grannis, AR
  • Average UV index in September: 6

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).

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Average cloud cover in September
Grannis, AR

Average cloud cover in September - Grannis, AR
  • Average cloud cover in September: 27

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 26).

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Average visibility in September
Grannis, AR

Average visibility in September - Grannis, AR
  • Average visibility in September: 6mi

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

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Grannis, Arkansas, USA

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