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
Ralston, Iowa, experiences a transition to a still warm 74.7°F (23.7°C) in average high-temperatures with the arrival of September, not greatly differing from August's 79.5°F (26.4°C). Throughout the month of September, Ralston expects an average low of 55.8°F (13.2°C).Humidity
In Ralston, the average relative humidity in September is 75%.Rainfall
In Ralston, during September, the rain falls for 10.9 days and regularly aggregates up to 2.72" (69mm) of precipitation. In Ralston, during the entire year, the rain falls for 130.1 days and collects up to 27.28" (693mm) of precipitation.Snowfall
June through September are months without snowfall in Ralston.Daylight
In Ralston, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:44 am and sunset at 7:51 pm. On the last day of September, in Ralston, Iowa, sunrise is at 7:15 am and sunset at 7:01 pm CDT.
Sunshine
In Ralston, the average sunshine in September is 9.2h.UV index
In Ralston, Iowa, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 4 during September translates into the following guidance:
Prioritize safety - Suggestions to prevent sun damage are offered. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Boost your sun resistance with garments that are densely woven yet spacious.
Frequently asked questions
What are the temperatures in Ralston in September?
What is the average humidity in September in Ralston?
How much does it rain in Ralston in September?
When it does not snow in Ralston?
Does it snow in Ralston in September?
What is the average length of the day in September in Ralston?
What time are sunrise and sunset in September in Ralston?
How many hours of sunshine does Ralston have in September?
What is the UV index reading in September in Ralston?
Average temperature in September
Ralston, IA
- Average high temperature in September: 74.7°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 (26.2°F).
- Average low temperature in September: 55.8°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure in September
Ralston, IA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Ralston, IA
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in September
Ralston, IA
- Average humidity in September: 75%
The month with the highest relative humidity is January (84%).
The months with the lowest relative humidity are April and October (69%).
Average rainfall in September
Ralston, IA
- Average rainfall in September: 2.72"
The wettest month (with the highest rainfall) is May (4.29").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in September
Ralston, IA
- Average rainfall days in September: 10.9 days
The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in September
Ralston, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.12").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Ralston, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Ralston, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 9h and 1min
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 12min).
Average sunshine days in September
Ralston, IA
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is June (10 days).
Average UV index in September
Ralston, 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 February (UV index 1).
Average cloud cover in September
Ralston, 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
Ralston, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January and August (5mi).
Ralston, Iowa, USA
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