September weather forecast
Martinsburg, MO

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Weather in September

The first month of the autumn, September, is still a warm month in Martinsburg, Missouri, with an average temperature fluctuating between 79°F (26.1°C) and 58.8°F (14.9°C).

Temperature

The onset of September brings a small shift in high-temperatures, falling from a warm 85.3°F (29.6°C) in August to a still moderately hot 79°F (26.1°C). In Martinsburg, an average temperature of 58.8°F (14.9°C) is noted during September nights.

Humidity

In September, the average relative humidity is 75%.

Rainfall

In Martinsburg, Missouri, during September, the rain falls for 11.2 days and regularly aggregates up to 2.05" (52mm) of precipitation. In Martinsburg, during the entire year, the rain falls for 139.8 days and collects up to 28.7" (729mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

The average length of the day in September in Martinsburg is 12h and 26min.
On the first day of the month, sunrise is at 6:36 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:50 pm CDT.

Sunshine

The average sunshine in September is 9.1h.

UV index

In Martinsburg, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 5 suggests this advice:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Updated: Aug 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Martinsburg in September?

In Martinsburg, 79°F (26.1°C) is the average high-temperature and 58.8°F (14.9°C) is the average low-temperature during September. In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 95°F (35°C).

What is the average humidity in September?

The average relative humidity in September is 75%.

How much does it rain in September?

In Martinsburg, in September, during 11.2 rainfall days, 2.05" (52mm) of precipitation is typically accumulated.

When it does not snow?

May through October are months without snowfall.

How many hours of daylight does Martinsburg have in September?

In September, the average day length is 12h and 26min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:36 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:50 pm CDT.

How many hours of sunshine does Martinsburg have in September?

In Martinsburg, the average sunshine duration in September is 9.1h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to the Sun's 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
Martinsburg, MO

Average temperature in September - Martinsburg, MO
  • Average high temperature in September: 79°F

The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in September: 58.8°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

Average pressure in September
Martinsburg, MO

Average pressure in September - Martinsburg, MO
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in September
Martinsburg, MO

Average wind speed in September - Martinsburg, MO
  • Average wind speed in September: 6.6mph

The windiest months (with the highest average wind speed) are January and February (9.3mph).
The calmest month (with the lowest average wind speed) is July (6mph).

Average humidity in September
Martinsburg, MO

Average humidity in September - Martinsburg, MO
  • Average humidity in September: 75%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (72%).

Average rainfall in September
Martinsburg, MO

Average rainfall in September - Martinsburg, MO
  • Average rainfall in September: 2.05"

The wettest month (with the highest rainfall) is May (3.39").
The driest months (with the least rainfall) are January and February (1.46").

Average rainfall days in September
Martinsburg, MO

Average rainfall days in September - Martinsburg, MO
  • Average rainfall days in September: 11.2 days

The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is December (6.5 days).

Average snowfall in September
Martinsburg, MO

Average snowfall in September - Martinsburg, MO
  • Average snowfall in September: 0"

The month with the highest snowfall is January (3.11").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Martinsburg, MO

Average snowfall days in September - Martinsburg, MO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (5.9 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
Martinsburg, MO

Average daylight in September / Average sunshine in September - Martinsburg, MO
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in September
Martinsburg, MO

Average sunshine days in September - Martinsburg, MO
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is December (20 days).
The month with the least sunshine days is May (12.2 days).

Average UV index in September
Martinsburg, MO

Average UV index in September - Martinsburg, MO
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Martinsburg, MO

Average cloud cover in September - Martinsburg, MO
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in September
Martinsburg, MO

Average visibility in September - Martinsburg, MO
  • 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).

Martinsburg, Missouri, USA

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