September weather forecast
Fort Sumner, NM

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Weather in September

In September, the summer heat in Fort Sumner, New Mexico, begins to wane, with a notable drop to 81.3°F (27.4°C) in the maximum temperature. The daylight hours gradually lessen, reflecting the imminent arrival of fall. As the rainfall frequency descends, the climate returns to drier conditions. A slight rise in the wind speed accompanies the shift from summer to autumn. Moreover, the atmosphere remains free of snowfall as warmth still prevails.

Temperature

With the arrival of September, Fort Sumner experiences a modest decline in average high-temperatures, transitioning from a hot 88.9°F (31.6°C) in August to a moderately hot 81.3°F (27.4°C). An average low-temperature of 60.8°F (16°C) is expected during September.

Heat index

September's heat index is appraised at 82.4°F (28°C). If one persists in activity during exposure, it could induce weariness and subsequently, heat cramps.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.

Humidity

In Fort Sumner, the average relative humidity in September 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

In Fort Sumner, snow does not fall in May through September.

Daylight

The average length of the day in September in Fort Sumner is 12h and 23min.
On the first day of September in Fort Sumner, sunrise is at 6:30 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:41 pm MDT.

Sunshine

The average sunshine in September is 10.8h.

UV index

The average daily maximum UV index in September in Fort Sumner is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 5 during September translates into the following directions:
Put precautions into practice - Ensuring skin and eye safety is a necessity. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Updated: Feb 13, 2024 | Published by: Weather U.S. | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What is the temperature in September in Fort Sumner?

An average high-temperature, in September, in Fort Sumner, is 81.3°F (27.4°C) and the average low-temperature is 60.8°F (16°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in September is appraised at 82.4°F (28°C).

What is the average humidity in September in Fort Sumner?

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

How many days does it rain in September in Fort Sumner?

In September, in Fort Sumner, the rain falls for 9.2 days. Throughout September, 1.06" (27mm) of precipitation is accumulated.

When it does not snow in Fort Sumner?

May through September are months without snowfall in Fort Sumner, New Mexico.

Does it snow in Fort Sumner in September?

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

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

The average day length in September is 12h and 23min.

When are sunrise and sunset in September in Fort Sumner?

On the first day of September, sunrise is at 6:30 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:41 pm MDT.

How long on average sun shines in September in Fort Sumner?

In September, the average sunshine duration in Fort Sumner, New Mexico, is 10.8h.

What is the UV index intensity 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 medium hazard to health from unprotected exposure to UV radiation.
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
Fort Sumner, NM

Average temperature in September - Fort Sumner, NM
  • Average high temperature in September: 81.3°F

The warmest months (with the highest average high temperature) are June and July (90°F).
The month with the lowest average high temperature is December (49.3°F).

  • Average low temperature in September: 60.8°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).

Average pressure in September
Fort Sumner, NM

Average pressure in September - Fort Sumner, NM
  • Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is April (29.86"Hg).

Average wind speed in September
Fort Sumner, NM

Average wind speed in September - Fort Sumner, NM
  • Average wind speed in September: 10.1mph

The windiest month (with the highest average wind speed) is April (12.9mph).
The calmest month (with the lowest average wind speed) is August (9mph).

Average humidity in September
Fort Sumner, NM

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 - Fort Sumner, NM
  • Average rainfall in September: 1.06"

The wettest month (with the highest rainfall) is July (1.61").
The driest month (with the least rainfall) is January (0.35").

Average rainfall days in September
Fort Sumner, NM

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

The month with the highest snowfall is November (1.85").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Fort Sumner, NM

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

The months with the highest number of snowfall days are January and December (3.5 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
Fort Sumner, NM

Average daylight in September / Average sunshine in September - Fort Sumner, NM
  • 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: 10h and 5min

The month with the most sunshine is June (Average sunshine: 11h and 54min).
The months with the least sunshine are January and December (Average sunshine: 7h and 6min).

Average sunshine days in September
Fort Sumner, NM

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 - 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 cloud cover in September
Fort Sumner, NM

Average cloud cover in September - Fort Sumner, NM
  • Average cloud cover in September: 16

The month with the most cloud cover is December (Cloud cover 19).
The month with the least cloud cover is June (Cloud cover 12).

Average visibility in September
Fort Sumner, NM

Average visibility in September - Fort Sumner, NM
  • Average visibility in September: 6mi

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

Fort Sumner, New Mexico, USA

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