September weather forecastOskaloosa, IA
September
Weather in September
September in Oskaloosa marks the beginning of fall, characterized by pleasing weather. The temperatures start to decrease, providing more comfortable weather conditions. With falling temperatures, September boasts perfect conditions to enjoy outdoor activities and festivities. It typically is an active time in the city due to various seasonal celebrations and events.Temperature
Oskaloosa in September witnesses an average high-temperature of a still warm 75.9°F (24.4°C), indicating a slight variation from August's 81.1°F (27.3°C). In the month of September, the temperature generally rests at an average low of 56.1°F (13.4°C).Humidity
In Oskaloosa, the average relative humidity in September is 76%.Rainfall
In Oskaloosa, during September, the rain falls for 12.2 days and regularly aggregates up to 2.87" (73mm) of precipitation. In Oskaloosa, during the entire year, the rain falls for 141.1 days and collects up to 28.5" (724mm) of precipitation.Snowfall
In Oskaloosa, snow does not fall in June through September.Daylight
In September, the average length of the day in Oskaloosa, Iowa, is 12h and 28min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:42 pm. On the last day of September, in Oskaloosa, sunrise is at 7:07 am and sunset at 6:53 pm CDT.
Sunshine
In September, the average sunshine in Oskaloosa, Iowa, is 9.4h.UV index
The average daily maximum UV index in September in Oskaloosa is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: In September, the maximum UV index of 4 suggests these recommendations:
Be vigilant - Preventing sunburn is recommended. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Oskaloosa, IA
- Average high temperature in September: 75.9°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in September: 56.1°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure in September
Oskaloosa, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Oskaloosa, IA
- Average wind speed in September: 7.9mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).
Average humidity in September
Oskaloosa, IA
- Average humidity in September: 76%
The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Oskaloosa, IA
- Average rainfall in September: 2.87"
The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in September
Oskaloosa, IA
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is June (18.6 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in September
Oskaloosa, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.92").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Oskaloosa, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Oskaloosa, IA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 24min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in September
Oskaloosa, IA
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (9 days).
Average UV index in September
Oskaloosa, IA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Oskaloosa, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are August and September (Cloud cover 29).
Average visibility in September
Oskaloosa, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
