September weather forecast and climate
Olney, MO

September, the first month of the autumn, in Olney, is also a moderately hot month, with temperature in the range of an average high of 79°F (26.1°C) and an average low of 58.8°F (14.9°C).

Temperature

In Olney, the average high-temperature marginally drops, from 85.3°F (29.6°C) in August, to a still warm 79°F (26.1°C). In Olney, the average low-temperature is 58.8°F (14.9°C).

Humidity

In September, the average relative humidity in Olney is 75%.

Rainfall

In Olney, during 11.2 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. In Olney, Missouri, during the entire year, the rain falls for 139.8 days and collects up to 28.7" (729mm) of precipitation.

Snowfall

In Olney snow does not fall in May through October.

Daylight

In Olney, Missouri, the average length of the day is 12.4h.

Sunshine

The average sunshine in Olney is 9.1h.

UV index

In Olney, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Olney?

The average high-temperature, in September, in Olney, is 79°F (26.1°C), while the average low-temperature is 58.8°F (14.9°C).

What is the average humidity in September in Olney?

In September, the average relative humidity is 75%.

How much does it rain in Olney in September?

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

When it does not snow in Olney?

May through October are months without snowfall in Olney.

How many hours of daylight does Olney have in September?

The average length of the day in September is 12.4h.

How long on average sun shines in September in Olney?

In Olney, Missouri, the average sunshine in September is 9.1h.

How high is the UV index in September in Olney?

In September, the average daily maximum UV index in Olney is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV radiation.
Average temperature in September - Olney, MO
  • Average high temperature in September: 26.1°C

The warmest month (with the highest average high temperature) is July (30.4°C).
The month with the lowest average high temperature is January (2.3°C).

  • Average low temperature in September: 14.9°C

The month with the highest average low temperature is July (19.8°C).
The coldest month (with the lowest average low temperature) is January (-5.3°C).

Average pressure in September - Olney, MO
  • Average pressure in September: 1016.7mbar

The month with the highest atmospheric pressure is January (1021.2mbar).
The month with the lowest atmospheric pressure is June (1013mbar).

Average wind speed in September - Olney, MO
  • Average wind speed in September: 10.6km/h

The windiest month (with the highest average wind speed) is January (15km/h).
The calmest month (with the lowest average wind speed) is July (9.6km/h).

Average humidity in September - Olney, 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 - Olney, MO
  • Average rainfall in September: 52mm

The wettest month (with the highest rainfall) is May (86mm).
The driest months (with the least rainfall) are January and February (37mm).

Average rainfall days in September - Olney, 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 - Olney, MO
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (79mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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

The month with the highest number of snowfall days is February (5.9 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Olney, MO
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 9.1h

The month with the most sunshine is June (Average sunshine: 10.2h).
The month with the least sunshine is January (Average sunshine: 4.4h).

Average sunshine days in September - Olney, 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 - Olney, MO
  • Average UV index in September: 5

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

Average cloud cover in September - Olney, 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 - Olney, MO
  • Average visibility in September: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).