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 arrival, Spirit Lake sees a decrease in average high-temperatures, moving from a warm 82°F (27.8°C) in August to an agreeable 71.4°F (21.9°C). Spirit Lake experiences a drastic reduction from day temperatures to an average low of 45°F (7.2°C) in September.Humidity
In Spirit Lake, the average relative humidity in September is 58%.Rainfall
In Spirit Lake, in September, it is raining for 8.4 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, there are 141.2 rainfall days, and 22.6" (574mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Spirit Lake. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow. Throughout the year, there are 71.8 snowfall days, and 56.54" (1436mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 33min.On the first day of September, sunrise is at 6:06 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:27 pm PDT.
Sunshine
In Spirit Lake, the average sunshine in September is 9.8h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 4 in September translates into these instructions:
Undertake protective steps - Preventing sun damage is advised. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How many days does it rain in September?
When does it start snowing?
How many hours of daylight does Spirit Lake have in September?
When is the sunrise / sunset in September in Spirit Lake?
How long on average sun shines in September in Spirit Lake?
How high is the UV index in September?
Average temperature in September
Spirit Lake, ID
- Average high temperature in September: 71.4°F
The warmest month (with the highest average high temperature) is August (82°F).
The month with the lowest average high temperature is December (31.3°F).
- Average low temperature in September: 45°F
The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is December (21.2°F).
Average pressure in September
Spirit Lake, ID
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in September
Spirit Lake, ID
- Average wind speed in September: 4.1mph
The windiest month (with the highest average wind speed) is April (5mph).
The calmest month (with the lowest average wind speed) is December (3.9mph).
Average humidity in September
Spirit Lake, ID
- Average humidity in September: 58%
The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is August (48%).
Average rainfall in September
Spirit Lake, ID
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is January (3.27").
The driest months (with the least rainfall) are July and August (0.43").
Average rainfall days in September
Spirit Lake, ID
- Average rainfall days in September: 8.4 days
The month with the highest number of rainy days is March (17.5 days).
The month with the least rainy days is August (5.6 days).
Average snowfall in September
Spirit Lake, ID
- Average snowfall in September: 0.31"
The month with the highest snowfall is January (16.57").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Spirit Lake, ID
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (16.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Spirit Lake, 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 30min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).
Average sunshine days in September
Spirit Lake, ID
- Average sunshine days in September: 19.8 days
The month with the most sunshine days is July (23.9 days).
The month with the least sunshine days is February (8.6 days).
Average UV index in September
Spirit Lake, 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 February, November and December (UV index 1).
Average cloud cover in September
Spirit Lake, ID
- Average cloud cover in September: 23
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Spirit Lake, ID
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).
Spirit Lake, Idaho, USA
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