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
With September's onset, the weather reveals a slight temperature decrease, transitioning from a warm 80.2°F (26.8°C) in August to a still moderately hot 73.9°F (23.3°C). Nighttime temperatures consistently average a cool 53.6°F (12°C) during September.Humidity
The average relative humidity in September in Lester is 71%.Rainfall
In Lester, in September, during 11.3 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. Throughout the year, there are 119.2 rainfall days, and 22.13" (562mm) of precipitation is accumulated.Snowfall
In Lester, Iowa, snow does not fall in June through September.Daylight
In September, the average length of the day in Lester is 12h and 29min.On the first day of September, sunrise is at 6:50 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:07 pm CDT.
Sunshine
In September, the average sunshine in Lester is 8.9h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Frequently asked questions
What is the temperature in September in Lester?
What is the average humidity in September in Lester?
How much does it rain in Lester in September?
When it does not snow in Lester?
Does it snow in Lester in September?
What is the average length of the day in September in Lester?
What time are sunrise and sunset in September in Lester?
How many hours of sunshine does Lester have in September?
What is the UV index intensity in September in Lester?
Average temperature in September
Lester, IA
- Average high temperature in September: 73.9°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 (23°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (9.5°F).
Average pressure in September
Lester, IA
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Lester, IA
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in September
Lester, IA
- Average humidity in September: 71%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (67%).
Average rainfall in September
Lester, IA
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is June (3.43").
The driest month (with the least rainfall) is January (0.71").
Average rainfall days in September
Lester, IA
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (2.7 days).
Average snowfall in September
Lester, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.61").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Lester, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (11.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lester, 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: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Lester, IA
- Average sunshine days in September: 17 days
The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is June (10.1 days).
Average UV index in September
Lester, 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 January (UV index 1).
Average cloud cover in September
Lester, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Lester, 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).
Lester, Iowa, USA
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