Guymon
Oklahoma, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Guymon, OK

September, the first month of the autumn, in Guymon, is also a moderately hot month, with average temperature fluctuating between 55.9°F (13.3°C) and 84.9°F (29.4°C).

Temperature

In Guymon, the average high-temperature slightly decreases, from a hot 91.9°F (33.3°C) in August, to a moderately hot 84.9°F (29.4°C). In September, in Guymon, Oklahoma, the average low-temperature is 55.9°F (13.3°C).

Heat index

In September, the average heat index is estimated at a hot 87.6°F (30.9°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', 'real feel', or 'apparent temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, clothing, metabolic differences). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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

In Guymon, the average relative humidity is 55%.

Rainfall

In September, in Guymon, the rain falls for 3.6 days. Throughout September, 1.9" (48.3mm) of precipitation is accumulated. Throughout the year, there are 44.4 rainfall days, and 20.9" (530.8mm) of precipitation is accumulated.

Snowfall

In Guymon, Oklahoma, in September, it doesn't snow. In October, it regularly snows. Throughout the year, 16.5" (419.1mm) of snow is accumulated.

Daylight

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

Sunshine

The average sunshine in September is 9h.

UV index

In Guymon, Oklahoma, the average daily maximum UV index is 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 8 translate into the following recommendations:
Take extra precautions. Protection against sun damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Guymon?

In September, in Guymon, Oklahoma, the average high-temperature is 84.9°F (29.4°C), and the average low-temperature is 55.9°F (13.3°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that combines air temperature and relative humidity, in September is evaluated at 87.6°F (30.9°C).

What is the average humidity in September in Guymon?

In September, the average relative humidity in Guymon is 55%.

How much does it rain in Guymon in September?

In Guymon, Oklahoma, in September, it is raining for 3.6 days, with typically 1.9" (48.3mm) of accumulated precipitation.

Does it snow in Guymon in September?

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

What is the average length of the day in September in Guymon?

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

How long on average sun shines in September in Guymon?

The average sunshine in September in Guymon is 9h.

How high is the UV index in September in Guymon?

In Guymon, Oklahoma, the average daily maximum UV index in September is 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in September - Guymon, OK
  • Average high temperature in September: 85°F

The warmest month (with the highest average high temperature) is July (93°F).
The month with the lowest average high temperature is January (48°F).

  • Average low temperature in September: 56°F

Months with the highest average low temperature are July and August (65°F).
The coldest month (with the lowest average low temperature) is January (21°F).

Average humidity in September - Guymon, OK
  • Average humidity in September: 55%

The month with the highest relative humidity is January (75%).
The month with the lowest relative humidity is August (54%).

Average rainfall in September - Guymon, OK
  • Average rainfall in September: 1.9"

The wettest month (with the highest rainfall) is July (3.5").
The driest month (with the lowest rainfall) is January (0.5").

Average rainfall days in September - Guymon, OK
  • Average rainfall days in September: 3.6 days

Months with the highest number of rainy days are May and July (6.2 days).
The month with the lowest number of rainy days is January (1.6 days).

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

The month with the highest snowfall is February (3.9").
Months with the lowest snowfall are June, July, August and September (0").

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

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

  • Average sunshine in September: 9h

Months with most sunshine are June and July (Average sunshine: 11h).
The month with least sunshine is December (Average sunshine: 6h).

Average UV index in September - Guymon, OK
  • Average UV index in September: 8

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 2).