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 is characterized by a mild reduction in the average high-temperature, from a moderately hot 77.7°F (25.4°C) in August to an agreeable 71.8°F (22.1°C). Saint Olaf's temperature drops to an average low of 52.7°F (11.5°C) during the nights of September.Humidity
In September, the average relative humidity is 80%.Rainfall
In September, the rain falls for 11.5 days. Throughout September, 2.6" (66mm) of precipitation is accumulated. In Saint Olaf, during the entire year, the rain falls for 138 days and collects up to 29.21" (742mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Saint Olaf, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:30 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:47 pm CDT.
Sunshine
The average sunshine in September is 9h.UV index
In Saint Olaf, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow in Saint Olaf?
Does it snow in September?
How many hours of daylight does Saint Olaf have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Saint Olaf have in September?
What is the UV index reading in September?
Average temperature in September
Saint Olaf, IA
- Average high temperature in September: 71.8°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (23.5°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (10.9°F).
Average pressure in September
Saint Olaf, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Saint Olaf, IA
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Saint Olaf, IA
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Saint Olaf, IA
- Average rainfall in September: 2.6"
The wettest month (with the highest rainfall) is June (4.25").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in September
Saint Olaf, IA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is February (3.6 days).
Average snowfall in September
Saint Olaf, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.04").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Saint Olaf, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Saint Olaf, 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 August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Saint Olaf, IA
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is June (8.9 days).
Average UV index in September
Saint Olaf, IA
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Saint Olaf, IA
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Saint Olaf, IA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
Saint Olaf, Iowa, USA
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