September weather forecast
Merriam Woods, MO

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Weather in September

September, the first month of the autumn in Merriam Woods, is still a warm month, with an average temperature fluctuating between 59.7°F (15.4°C) and 81.7°F (27.6°C).

Temperature

September ushers in a minor alteration in Merriam Woods's climate, with the average high-temperature moving from August's hot 88.9°F (31.6°C) to a moderately hot 81.7°F (27.6°C). Merriam Woods's September nights see a large temperature deviation, with temperatures resting at a low of 59.7°F (15.4°C).

Heat index

Throughout September, the heat index is evaluated at a hot 86°F (30°C). With constant exposure and activity, a state of weariness might ensue, leading to potential heat cramps.
Records show heat index calculations are tailored for shaded regions and mild winds. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'feels like', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.

Humidity

In Merriam Woods, Missouri, the average relative humidity in September is 74%.

Rainfall

In Merriam Woods, in September, it is raining for 11.8 days, with typically 1.89" (48mm) of accumulated precipitation. In Merriam Woods, during the entire year, the rain falls for 142.8 days and collects up to 30.47" (774mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In Merriam Woods, Missouri, the average length of the day in September is 12h and 24min.
On the first day of the month, sunrise is at 6:44 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:07 am and sunset at 6:57 pm CDT.

Sunshine

In Merriam Woods, the average sunshine in September is 9.4h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: In September, the maximum UV index of 5 suggests these recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Updated: Jul 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The high-temperature, in September, in Merriam Woods, records 81.7°F (27.6°C), while the low-temperature is 59.7°F (15.4°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in September is evaluated at 86°F (30°C).

What is the average humidity in September?

The average relative humidity in September is 74%.

How much does it rain in September?

In Merriam Woods, in September, during 11.8 rainfall days, 1.89" (48mm) of precipitation is typically accumulated.

When it does not snow?

May through October are months without snowfall.

What is the average length of the day in September?

The average day length in September is 12h and 24min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:44 am and sunset at 7:40 pm. On the last day of the month, in Merriam Woods, sunrise is at 7:07 am and sunset at 6:57 pm CDT.

How long on average sun shines in September?

The average sunshine duration in September in Merriam Woods, Missouri, is 9.4h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to Sun's UV rays.
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
Merriam Woods, MO

Average temperature in September - Merriam Woods, MO
  • Average high temperature in September: 81.7°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (44.1°F).

  • Average low temperature in September: 59.7°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (27.9°F).

Average pressure in September
Merriam Woods, MO

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

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
Merriam Woods, MO

Average wind speed in September - Merriam Woods, MO
  • Average wind speed in September: 5.2mph

The windiest months (with the highest average wind speed) are January, February, March and April (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.9mph).

Average humidity in September
Merriam Woods, MO

Average humidity in September - Merriam Woods, MO
  • Average humidity in September: 74%

The months with the highest relative humidity are March and May (78%).
The months with the lowest relative humidity are January, July, August and October (73%).

Average rainfall in September
Merriam Woods, MO

Average rainfall in September - Merriam Woods, MO
  • Average rainfall in September: 1.89"

The wettest month (with the highest rainfall) is May (4.41").
The driest month (with the least rainfall) is February (1.42").

Average rainfall days in September
Merriam Woods, MO

Average rainfall days in September - Merriam Woods, MO
  • Average rainfall days in September: 11.8 days

The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (7.2 days).

Average snowfall in September
Merriam Woods, MO

Average snowfall in September - Merriam Woods, MO
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.46").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Merriam Woods, MO

Average snowfall days in September - Merriam Woods, MO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.4 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
Merriam Woods, MO

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

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 42min).
The months with the least sunshine are January and February (Average sunshine: 5h and 24min).

Average sunshine days in September
Merriam Woods, MO

Average sunshine days in September - Merriam Woods, MO
  • Average sunshine days in September: 15.8 days

The month with the most sunshine days is December (21.5 days).
The month with the least sunshine days is July (12.2 days).

Average UV index in September
Merriam Woods, MO

Average UV index in September - Merriam Woods, MO
  • Average UV index in September: 5

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

Average cloud cover in September
Merriam Woods, MO

Average cloud cover in September - Merriam Woods, MO
  • Average cloud cover in September: 30

The month with the most cloud cover is March (Cloud cover 47).
The months with the least cloud cover are June, July and August (Cloud cover 28).

Average visibility in September
Merriam Woods, MO

Average visibility in September - Merriam Woods, MO
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Merriam Woods, Missouri, USA

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