September weather forecastFort Madison, IA
September
Weather in September
In September, the city of Fort Madison transitions to Autumn with a noticeable dip in temperature. The humidity levels drop, offering the residents the first signs of relief after the prolonged summer heat. The duration of sunlight reduces, and the leaves start changing colors, making the surroundings picturesque. Wind speed increases slightly, contributing to the pleasant weather parameters. A more significant cooldown is rendered, with temperatures now oscillating between 57.4°F (14.1°C) and 77°F (25°C).Temperature
Stepping into September, Fort Madison records an average high-temperature of a still warm 77°F (25°C), almost consistent with August. In Fort Madison, the average nighttime temperature during September is a moderate 57.4°F (14.1°C).Humidity
In September, the average relative humidity is 74%.Rainfall
In Fort Madison, in September, during 8.2 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. In Fort Madison, during the entire year, the rain falls for 101.8 days and collects up to 9.92" (252mm) of precipitation.Snowfall
In Fort Madison, snow does not fall in May through September.Daylight
In Fort Madison, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:48 pm CDT.
Sunshine
In Fort Madison, the average sunshine in September is 9.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 4 during September leads to these advisories:
Take precautions - Protection against sunburn is recommended. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Fort Madison, IA
- Average high temperature in September: 77°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (30.4°F).
- Average low temperature in September: 57.4°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in September
Fort Madison, 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 (29.9"Hg).
Average wind speed in September
Fort Madison, IA
- Average wind speed in September: 7.7mph
The windiest months (with the highest average wind speed) are January, February, March and April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.7mph).
Average humidity in September
Fort Madison, IA
- Average humidity in September: 74%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Fort Madison, IA
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is May (1.46").
The driest months (with the least rainfall) are January and December (0.47").
Average rainfall days in September
Fort Madison, IA
- Average rainfall days in September: 8.2 days
The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is February (3.5 days).
Average snowfall in September
Fort Madison, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.1").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Fort Madison, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Fort Madison, IA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Fort Madison, IA
- Average sunshine days in September: 19.4 days
The month with the most sunshine days is December (22.9 days).
The month with the least sunshine days is May (14 days).
Average UV index in September
Fort Madison, IA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Fort Madison, IA
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July, August and September (Cloud cover 28).
Average visibility in September
Fort Madison, 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).
