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
As September commences, the average high-temperature shows a reduction, transitioning from a moderately hot 79.9°F (26.6°C) in August to a pleasant 68.5°F (20.3°C). September presents a pronounced difference from daytime highs, with a consistent average low-temperature of 41.9°F (5.5°C).Humidity
The average relative humidity in September is 62%.Rainfall
In September, in Dover, the rain falls for 9.5 days. Throughout September, 0.98" (25mm) of precipitation is accumulated. In Dover, during the entire year, the rain falls for 151 days and collects up to 23.98" (609mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.59" (15mm) of snow. Throughout the year, there are 80.7 snowfall days, and 61.3" (1557mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 6:05 am and sunset at 7:27 pm. On the last day of September, sunrise is at 6:45 am and sunset at 6:26 pm PDT.
Sunshine
In Dover, the average sunshine in September is 9.7h.UV index
In Dover, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 3 during September translates into the following guidance:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start snowing?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Dover, ID
- Average high temperature in September: 68.5°F
The warmest month (with the highest average high temperature) is August (79.9°F).
The month with the lowest average high temperature is December (28.9°F).
- Average low temperature in September: 41.9°F
The month with the highest average low temperature is August (48.6°F).
The coldest month (with the lowest average low temperature) is December (18.5°F).
Average pressure in September
Dover, ID
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).
Average wind speed in September
Dover, ID
- Average wind speed in September: 3.8mph
The windiest month (with the highest average wind speed) is April (4.5mph).
The calmest month (with the lowest average wind speed) is December (3.4mph).
Average humidity in September
Dover, ID
- Average humidity in September: 62%
The month with the highest relative humidity is January (95%).
The month with the lowest relative humidity is August (53%).
Average rainfall in September
Dover, ID
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is January (3.35").
The driest month (with the least rainfall) is August (0.43").
Average rainfall days in September
Dover, ID
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is March (18.8 days).
The month with the least rainy days is August (6.3 days).
Average snowfall in September
Dover, ID
- Average snowfall in September: 0.59"
The month with the highest snowfall is January (17.28").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Dover, ID
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (18.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Dover, ID
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in September
Dover, ID
- Average sunshine days in September: 18.5 days
The months with the most sunshine days are July and August (21.4 days).
The month with the least sunshine days is March (7.9 days).
Average UV index in September
Dover, ID
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February, November and December (UV index 1).
Average cloud cover in September
Dover, ID
- Average cloud cover in September: 25
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 14).
Average visibility in September
Dover, ID
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January and February (3mi).
Dover, Idaho, USA
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