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
Arrival of September comes with a reduction in the average high-temperature, falling from a moderately hot 77.7°F (25.4°C) in August to an agreeable 68°F (20°C). September nights in Lanark, Idaho, show a substantial disparity from the daytime peak with an average low-temperature of 42.3°F (5.7°C).Humidity
In September, the average relative humidity in Lanark is 49%.Rainfall
In Lanark, Idaho, in September, during 9.1 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. Throughout the year, there are 117.5 rainfall days, and 20.24" (514mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 0.35" (9mm) of snow. In Lanark, during the entire year, snow falls for 116.1 days and aggregates up to 91.14" (2315mm) of snow.Daylight
The average length of the day in September in Lanark is 12h and 28min.On the first day of September, sunrise is at 6:51 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:08 pm MDT.
Sunshine
In Lanark, Idaho, the average sunshine in September is 10.1h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high daily UV index of 3 during September translates into the following directions:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Lanark?
What is the average humidity in September in Lanark?
How much does it rain in Lanark in September?
When does it start to snow in Lanark?
What is the average length of the day in September in Lanark?
What time are sunrise and sunset in September in Lanark?
How many hours of sunshine does Lanark have in September?
What is the UV index intensity in September in Lanark?
Average temperature in September
Lanark, ID
- Average high temperature in September: 68°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is December (25.2°F).
- Average low temperature in September: 42.3°F
The month with the highest average low temperature is July (48.9°F).
The coldest month (with the lowest average low temperature) is January (7.9°F).
Average pressure in September
Lanark, ID
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Lanark, ID
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is June (5.8mph).
The calmest months (with the lowest average wind speed) are January and December (4.2mph).
Average humidity in September
Lanark, ID
- Average humidity in September: 49%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is August (42%).
Average rainfall in September
Lanark, ID
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is May (2.6").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in September
Lanark, ID
- Average rainfall days in September: 9.1 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (6 days).
Average snowfall in September
Lanark, ID
- Average snowfall in September: 0.35"
The month with the highest snowfall is February (18.39").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Lanark, ID
- Average snowfall days in September: 0.5 days
The month with the highest number of snowfall days is December (21.6 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Lanark, ID
- 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 6min).
- Average sunshine in September: 10h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in September
Lanark, ID
- Average sunshine days in September: 18.3 days
The month with the most sunshine days is July (18.8 days).
The month with the least sunshine days is February (6.8 days).
Average UV index in September
Lanark, ID
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Lanark, ID
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Lanark, ID
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (3mi).
Lanark, Idaho, USA
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