September weather forecast
Richmond Heights, MO

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Richmond Heights, Missouri, with temperature in the range of an average high of 79.7°F (26.5°C) and an average low of 60.1°F (15.6°C).

Temperature

A minor decrease in the average high-temperature is observed during September, shifting from a warm 85.5°F (29.7°C) in August to a still moderately hot 79.7°F (26.5°C). Nighttime temperature lowers to an average of 60.1°F (15.6°C) in September.

Humidity

In September, the average relative humidity is 73%.

Rainfall

In Richmond Heights, in September, it is raining for 12 days, with typically 1.97" (50mm) of accumulated precipitation. In Richmond Heights, during the entire year, the rain falls for 144.8 days and collects up to 30.59" (777mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

In Richmond Heights, the average length of the day in September is 12h and 25min.
On the first day of September, sunrise is at 6:31 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:45 pm CDT.

Sunshine

The average sunshine in September is 9.6h.

UV index

In Richmond Heights, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.

Frequently asked questions

What are September temperatures?

September temperatures in Richmond Heights vary between a high-temperature of 79.7°F (26.5°C) and a low-temperature of 60.1°F (15.6°C). In August, the average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, is computed to be 95°F (35°C).

What is the average humidity in September?

The average relative humidity in September in Richmond Heights is 73%.

How many days does it rain in September?

In September, the rain falls for 12 days. Throughout September, 1.97" (50mm) of precipitation is accumulated.

When it does not snow?

April through October are months without snowfall.

What is the average length of the day in September?

The average day length in September in Richmond Heights is 12h and 25min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:31 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:45 pm CDT.

How long on average sun shines in September?

The average sunshine duration in September is 9.6h.

What is the UV index reading in September in Richmond Heights?

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health threat 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
Richmond Heights, MO

Average temperature in September - Richmond Heights, MO
  • Average high temperature in September: 79.7°F

The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in September: 60.1°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in September
Richmond Heights, MO

Average pressure in September - Richmond Heights, 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 (29.92"Hg).

Average wind speed in September
Richmond Heights, MO

Average wind speed in September - Richmond Heights, MO
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

Average humidity in September
Richmond Heights, MO

Average humidity in September - Richmond Heights, MO
  • Average humidity in September: 73%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (70%).

Average rainfall in September
Richmond Heights, MO

Average rainfall in September - Richmond Heights, MO
  • Average rainfall in September: 1.97"

The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is February (1.69").

Average rainfall days in September
Richmond Heights, MO

Average rainfall days in September - Richmond Heights, MO
  • Average rainfall days in September: 12 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (6.5 days).

Average snowfall in September
Richmond Heights, MO

Average snowfall in September - Richmond Heights, MO
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.6").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Richmond Heights, MO

Average snowfall days in September - Richmond Heights, MO
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are May, June, July and August (0 days).

Average daylight in September /
Average sunshine in September
Richmond Heights, MO

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

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 4min

The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

Average sunshine days in September
Richmond Heights, MO

Average sunshine days in September - Richmond Heights, MO
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is January (21 days).
The month with the least sunshine days is June (11.2 days).

Average UV index in September
Richmond Heights, MO

Average UV index in September - Richmond Heights, 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, February and December (UV index 2).

Average cloud cover in September
Richmond Heights, MO

Average cloud cover in September - Richmond Heights, MO
  • Average cloud cover in September: 28

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in September
Richmond Heights, MO

Average visibility in September - Richmond Heights, 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).

Richmond Heights, Missouri, USA

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