September weather forecastTripoli, IA
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Tripoli, Iowa, with an average temperature ranging between max 71.8°F (22.1°C) and min 53.4°F (11.9°C).Temperature
The start of September involves a subtle temperature drop, shifting from a moderately hot 77.7°F (25.4°C) in August to a pleasant 71.8°F (22.1°C). During September, the average low-temperature is a cool 53.4°F (11.9°C).Humidity
In September, the average relative humidity is 79%.Rainfall
In Tripoli, during September, the rain falls for 12.5 days and regularly aggregates up to 2.28" (58mm) of precipitation. Throughout the year, in Tripoli, there are 146.8 rainfall days, and 30.79" (782mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September in Tripoli is 12h and 29min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:43 pm. On the last day of September, in Tripoli, Iowa, sunrise is at 7:06 am and sunset at 6:51 pm CDT.
Sunshine
The average sunshine in September is 9.1h.UV index
In Tripoli, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Tripoli, IA
- Average high temperature in September: 71.8°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (23.5°F).
- Average low temperature in September: 53.4°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (11.1°F).
Average pressure in September
Tripoli, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Tripoli, IA
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in September
Tripoli, IA
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Tripoli, IA
- Average rainfall in September: 2.28"
The wettest month (with the highest rainfall) is June (5.04").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days in September
Tripoli, IA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (20.3 days).
The months with the least rainy days are January and February (4.3 days).
Average snowfall in September
Tripoli, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.83").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Tripoli, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Tripoli, IA
- Average daylight in September: 12h and 30min
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 6min
The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Tripoli, IA
- Average sunshine days in September: 15.4 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is June (7.3 days).
Average UV index in September
Tripoli, IA
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Tripoli, IA
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in September
Tripoli, IA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
