September weather forecast and climate
Griggs, OK

Weather in September

September, the first month of the autumn, in Griggs, is still a warm month, with average temperature fluctuating between 62.2°F (16.8°C) and 83.3°F (28.5°C).

Temperature

In September, the average high-temperature marginally drops, from a hot 91°F (32.8°C) in August, to a moderately hot 83.3°F (28.5°C). The average low-temperature, in Griggs, Oklahoma, is 62.2°F (16.8°C).

Heat index

The average heat index is appraised at 84.2°F (29°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, differences in body mass, height, and shape, wind). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in Griggs is 50%.

Rainfall

In Griggs, during September, the rain falls for 9.4 days and regularly aggregates up to 0.94" (24mm) of precipitation. Throughout the year, in Griggs, there are 82.6 rainfall days, and 11.81" (300mm) of precipitation is accumulated.

Snowfall

In Griggs snow does not fall in June through September.

Daylight

The average length of the day in Griggs is 12.4h.

Sunshine

In Griggs, the average sunshine is 9.5h.

UV index

In September, the average daily maximum UV index in Griggs is 5. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Griggs?

In Griggs, in September, the average high-temperature is 83.3°F (28.5°C), and the average low-temperature is 62.2°F (16.8°C). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is appraised at 84.2°F (29°C).

What is the average humidity in September in Griggs?

In September, the average relative humidity in Griggs is 50%.

How much does it rain in Griggs in September?

In Griggs, in September, during 9.4 rainfall days, 0.94" (24mm) of precipitation is typically accumulated.

When it does not snow in Griggs?

June through September are months without snowfall in Griggs.

Does it snow in Griggs in September?

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

How many hours of daylight does Griggs have in September?

In September, the average length of the day in Griggs, Oklahoma, is 12.4h.

How many hours of sunshine does Griggs have in September?

In September, the average sunshine in Griggs is 9.5h.

What is the UV index intensity in September in Griggs?

The average daily maximum UV index in September in Griggs is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in September
Griggs, OK

Average temperature in September - Griggs, OK
  • Average high temperature in September: 83.3°F

The warmest month (with the highest average high temperature) is July (92.8°F).
The month with the lowest average high temperature is December (47.7°F).

  • Average low temperature in September: 62.2°F

The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).

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Average pressure in September
Griggs, OK

Average pressure in September - Griggs, OK
  • Average pressure in September: 29.94"

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.81").

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Average wind speed in September
Griggs, OK

Average wind speed in September - Griggs, OK
  • Average wind speed in September: 12mph

The windiest month (with the highest average wind speed) is April (13.4mph).
The calmest month (with the lowest average wind speed) is August (10.6mph).

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Average humidity in September
Griggs, OK

Average humidity in September - Griggs, OK
  • Average humidity in September: 50%

The month with the highest relative humidity is December (56%).
Months with the lowest relative humidity are March, April and June (43%).

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Average rainfall in September
Griggs, OK

Average rainfall in September - Griggs, OK
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is July (1.93").
The driest months (with the least rainfall) are February and November (0.35").

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Average rainfall days in September
Griggs, OK

Average rainfall days in September - Griggs, OK
  • Average rainfall days in September: 9.4 days

The month with the highest number of rainy days is July (12.8 days).
The month with the least rainy days is January (1.8 days).

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Average snowfall in September
Griggs, OK

Average snowfall in September - Griggs, OK
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.81").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Griggs, OK

Average snowfall days in September - Griggs, OK
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Griggs, OK

Average daylight in September / Average sunshine in September - Griggs, OK
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 9.5h

The month with the most sunshine is June (Average sunshine: 11.8h).
The month with the least sunshine is December (Average sunshine: 6.8h).

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Average sunshine days in September
Griggs, OK

Average sunshine days in September - Griggs, OK
  • Average sunshine days in September: 18.3 days

The month with the most sunshine days is January (26.2 days).
The month with the least sunshine days is August (15.5 days).

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Average UV index in September
Griggs, OK

Average UV index in September - Griggs, OK
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in September
Griggs, OK

Average cloud cover in September - Griggs, OK
  • Average cloud cover in September: 18

Months with the most cloud cover are February and April (Cloud cover 24).
The month with the least cloud cover is June (Cloud cover 14).

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Average visibility in September
Griggs, OK

Average visibility in September - Griggs, OK
  • Average visibility in September: 6mi

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

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