Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Illmo, Missouri, experiences an average high-temperature of a warm 81.1°F (27.3°C) in September, subtly different from August's 86.2°F (30.1°C). Illmo's nighttime temperature in September drops to an average of 61.3°F (16.3°C).Heat index
During September, the heat index is estimated at a tropical 86°F (30°C). Exhaustion might be the outcome of enduring exposure and continuous activity, with a risk of heat cramps.Know that the heat index computations account for shaded terrains and slight winds. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
Humidity
The average relative humidity in September in Illmo is 73%.Rainfall
The month with the least rainfall in Illmo is September, when the rain falls for 11.4 days and typically collects 1.5" (38mm) of precipitation.Snowfall
In Illmo, snow does not fall in May through September.Daylight
The average length of the day in September in Illmo is 12h and 25min.On the first day of September, sunrise is at 6:29 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:42 pm CDT.
Sunshine
In September, the average sunshine is 9.7h.UV index
In September, the average daily maximum UV index in Illmo is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 5 suggests these recommendations:
Undertake precautions - Guarding against sun damage is counselled. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Frequently asked questions
What is the temperature in September in Illmo?
What is the average humidity in September in Illmo?
What is the driest month in Illmo?
How much does it rain in Illmo in September?
When it does not snow in Illmo?
Does it snow in Illmo in September?
What is the average length of the day in September in Illmo?
When are sunrise and sunset in September in Illmo?
How many hours of sunshine does Illmo have in September?
What is the UV index reading in September in Illmo?
Average temperature in September
Illmo, MO
- Average high temperature in September: 81.1°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (41°F).
- Average low temperature in September: 61.3°F
The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (27.9°F).
Average pressure in September
Illmo, 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 (29.94"Hg).
Average wind speed in September
Illmo, MO
- Average wind speed in September: 6.2mph
The windiest months (with the highest average wind speed) are January and February (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in September
Illmo, MO
- Average humidity in September: 73%
The months with the highest relative humidity are March and May (78%).
The month with the lowest relative humidity is October (69%).
Average rainfall in September
Illmo, MO
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is April (4.33").
The driest month (with the least rainfall) is September (1.5").
Average rainfall days in September
Illmo, MO
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is January (9.8 days).
Average snowfall in September
Illmo, MO
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.17").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Illmo, MO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.7 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
Illmo, MO
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Illmo, MO
- Average sunshine days in September: 16.9 days
The month with the most sunshine days is October (18.6 days).
The month with the least sunshine days is July (11.9 days).
Average UV index in September
Illmo, 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
Illmo, MO
- Average cloud cover in September: 27
The month with the most cloud cover is February (Cloud cover 48).
The months with the least cloud cover are June, August and September (Cloud cover 27).
Average visibility in September
Illmo, 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).
Illmo, Missouri, USA
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