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
September signifies a gentle decline in Onawa Junction's average high-temperature, easing from a warm 79.3°F (26.3°C) in August to a still moderately hot 73.8°F (23.2°C). Onawa Junction observes an average nighttime temperature of 55°F (12.8°C) during September.Humidity
In Onawa Junction, the average relative humidity in September is 73%.Rainfall
In September, the rain falls for 10.6 days. Throughout September, 1.77" (45mm) of precipitation is accumulated. Throughout the year, there are 117 rainfall days, and 19.84" (504mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September in Onawa Junction is 12h and 29min.On the first day of September, sunrise is at 6:47 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:04 pm CDT.
Sunshine
In September, the average sunshine is 9h.UV index
The average daily maximum UV index in September in Onawa Junction is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Onawa Junction?
What is the average humidity in September in Onawa Junction?
How much does it rain in Onawa Junction in September?
When it does not snow in Onawa Junction?
Does it snow in Onawa Junction in September?
How many hours of daylight does Onawa Junction have in September?
When are sunrise and sunset in September in Onawa Junction?
How long on average sun shines in September in Onawa Junction?
How high is the UV index in September in Onawa Junction?
Average temperature in September
Onawa Junction, IA
- Average high temperature in September: 73.8°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (24.4°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (12°F).
Average pressure in September
Onawa Junction, IA
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Onawa Junction, IA
- Average wind speed in September: 9mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.6mph).
Average humidity in September
Onawa Junction, IA
- Average humidity in September: 73%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and October (68%).
Average rainfall in September
Onawa Junction, IA
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is June (3.15").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Onawa Junction, IA
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (2.6 days).
Average snowfall in September
Onawa Junction, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.19").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Onawa Junction, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Onawa Junction, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Onawa Junction, IA
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in September
Onawa Junction, 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
Onawa Junction, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Onawa Junction, IA
- 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).
Onawa Junction, Iowa, USA
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