September weather forecast and climate
Fort Sumner, NM

The first month of the autumn, September, is still a warm month in Fort Sumner, New Mexico, with average temperature fluctuating between 60.8°F (16°C) and 81.3°F (27.4°C).

Temperature

In Fort Sumner, the average high-temperature in September slightly decreases, from a tropical 88.9°F (31.6°C) in August, to a warm 81.3°F (27.4°C). The average low-temperature, in Fort Sumner, is 60.8°F (16°C).

Heat index

In September, the average heat index is evaluated at 81.9°F (27.7°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. 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', 'apparent temperature', 'real feel', or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, clothing, metabolic differences, and pregnancy affect individual temperature impact. 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 Fort Sumner, New Mexico, the average relative humidity is 48%.

Rainfall

In Fort Sumner, in September, during 9.2 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. In Fort Sumner, during the entire year, the rain falls for 78.6 days and collects up to 9.06" (230mm) of precipitation.

Snowfall

May through September are months without snowfall in Fort Sumner.

Daylight

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

Sunshine

In September, the average sunshine is 10.8h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 Fort Sumner?

In September, the average high-temperature is 81.3°F (27.4°C), and the average low-temperature is 60.8°F (16°C). In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), that combines air temperature and relative humidity, is appraised at 81.9°F (27.7°C).

What is the average humidity in September in Fort Sumner?

In Fort Sumner, New Mexico, the average relative humidity in September is 48%.

How much does it rain in Fort Sumner in September?

In Fort Sumner, in September, it is raining for 9.2 days, with typically 1.06" (27mm) of accumulated precipitation.

Does it snow in Fort Sumner in September?

In Fort Sumner, New Mexico, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Fort Sumner?

May through September are months without snowfall in Fort Sumner.

How many hours of daylight does Fort Sumner have in September?

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

How many hours of sunshine does Fort Sumner have in September?

The average sunshine in September in Fort Sumner is 10.8h.

What is the UV index reading in September in Fort Sumner?

In September, the average daily maximum UV index in Fort Sumner, New Mexico, is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.
Average temperature in September - Fort Sumner, NM
  • Average high temperature in September: 27.4°C

The warmest months (with the highest average high temperature) are June and July (32.2°C).
The month with the lowest average high temperature is December (9.6°C).

  • Average low temperature in September: 16°C

The month with the highest average low temperature is July (20.5°C).
The coldest month (with the lowest average low temperature) is January (-0.8°C).

Average pressure in September - Fort Sumner, NM
  • Average pressure in September: 1015.5mbar

The month with the highest atmospheric pressure is January (1020mbar).
The month with the lowest atmospheric pressure is April (1011.3mbar).

Average wind speed in September - Fort Sumner, NM
  • Average wind speed in September: 16.3km/h

The windiest month (with the highest average wind speed) is April (20.8km/h).
The calmest month (with the lowest average wind speed) is August (14.5km/h).

Average humidity in September - Fort Sumner, NM
  • Average humidity in September: 48%

The month with the highest relative humidity is December (52%).
The month with the lowest relative humidity is April (31%).

Average rainfall in September - Fort Sumner, NM
  • Average rainfall in September: 27mm

The wettest month (with the highest rainfall) is July (41mm).
The driest month (with the least rainfall) is January (9mm).

Average rainfall days in September - Fort Sumner, NM
  • Average rainfall days in September: 9.2 days

The month with the highest number of rainy days is July (12.5 days).
The month with the least rainy days is November (2.4 days).

Average snowfall in September - Fort Sumner, NM
  • Average snowfall in September: 0mm

The month with the highest snowfall is November (47mm).
Months with the least snowfall are May, June, July, August and September (0mm).

Average snowfall days in September - Fort Sumner, NM
  • Average snowfall days in September: 0 days

Months with the highest number of snowfall days are January and December (3.5 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Fort Sumner, NM
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 10.8h

The month with the most sunshine is June (Average sunshine: 11.9h).
Months with the least sunshine are January and December (Average sunshine: 7.1).

Average sunshine days in September - Fort Sumner, NM
  • Average sunshine days in September: 17.9 days

The month with the most sunshine days is November (25.5 days).
The month with the least sunshine days is July (14 days).

Average UV index in September - Fort Sumner, NM
  • Average UV index in September: 5

The month with the highest UV index is June (UV index 7).
The month with the lowest UV index is December (UV index 2).

Average visibility in September - Fort Sumner, NM
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).