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
As August makes way for September, Spirit Lake's average high-temperature eases from a moderately hot 78.3°F (25.7°C) to a pleasant 72.5°F (22.5°C). Nightly temperatures drop to an average low of 53.6°F (12°C) in September.Humidity
In Spirit Lake, the average relative humidity in September is 74%.Rainfall
In Spirit Lake, in September, during 11.5 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. Throughout the year, there are 124.6 rainfall days, and 24.37" (619mm) of precipitation is accumulated.Snowfall
In Spirit Lake, snow does not fall in June through September.Daylight
The average length of the day in September in Spirit Lake, Iowa, is 12h and 29min.On the first day of September, sunrise is at 6:45 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 7:02 pm CDT.
Sunshine
In Spirit Lake, the average sunshine in September is 9h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September in Spirit Lake?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Spirit Lake have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Spirit Lake have in September?
What is the UV index reading in September?
Average temperature in September
Spirit Lake, IA
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (9.3°F).
Average pressure in September
Spirit Lake, 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
Spirit Lake, IA
- Average wind speed in September: 9.1mph
The windiest months (with the highest average wind speed) are January, February and April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in September
Spirit Lake, IA
- Average humidity in September: 74%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (68%).
Average rainfall in September
Spirit Lake, IA
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is June (3.9").
The driest month (with the least rainfall) is January (0.83").
Average rainfall days in September
Spirit Lake, IA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is February (2.1 days).
Average snowfall in September
Spirit Lake, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.47").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Spirit Lake, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (10.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Spirit Lake, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Spirit Lake, IA
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is June (8.6 days).
Average UV index in September
Spirit Lake, IA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February and November (UV index 1).
Average cloud cover in September
Spirit Lake, IA
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Spirit Lake, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Spirit Lake, Iowa, USA
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