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
The shift from August to September involves a decrease in the average high-temperature, dropping from a moderately hot 82.9°F (28.3°C) to a pleasant 72.7°F (22.6°C). Compared to daytime temperatures, Herbert's temperature drops significantly, averaging a chilly 47.3°F (8.5°C) during the nights of September.Humidity
In Herbert, the average relative humidity in September is 43%.Rainfall
In Herbert, in September, it is raining for 9 days, with typically 0.91" (23mm) of accumulated precipitation. In Herbert, during the entire year, the rain falls for 120.3 days and collects up to 11.02" (280mm) of precipitation.Snowfall
Months with snowfall in Herbert, Idaho, are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Herbert, during the entire year, snow falls for 84.8 days and aggregates up to 31.85" (809mm) of snow.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:51 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:08 pm MDT.
Sunshine
In September, the average sunshine in Herbert is 10h.UV index
In Herbert, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 suggests this advice:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Frequently asked questions
What is the average September temperature in Herbert?
What is the average humidity in September in Herbert?
How many days does it rain in September in Herbert?
When does it start snowing in Herbert?
What is the average length of the day in September in Herbert?
When are sunrise and sunset in September in Herbert?
How long on average sun shines in September in Herbert?
What is the UV index reading in September in Herbert?
Average temperature in September
Herbert, ID
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is December (26.6°F).
- Average low temperature in September: 47.3°F
The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).
Average pressure in September
Herbert, ID
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Herbert, ID
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is January (4.3mph).
Average humidity in September
Herbert, ID
- Average humidity in September: 43%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (38%).
Average rainfall in September
Herbert, ID
- Average rainfall in September: 0.91"
The wettest months (with the highest rainfall) are April and May (1.26").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Herbert, ID
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is April (14.9 days).
The month with the least rainy days is July (6.3 days).
Average snowfall in September
Herbert, ID
- Average snowfall in September: 0.04"
The month with the highest snowfall is January (8.9").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Herbert, ID
- Average snowfall days in September: 0.1 days
The months with the highest number of snowfall days are January and February (18.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Herbert, ID
- 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: 10h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Herbert, ID
- Average sunshine days in September: 18 days
The month with the most sunshine days is July (20.6 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in September
Herbert, ID
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Herbert, ID
- Average cloud cover in September: 16
The months with the most cloud cover are January and February (Cloud cover 53).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in September
Herbert, ID
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
Herbert, Idaho, USA
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