September weather forecastRathdrum, ID
September
Weather in September
September in Rathdrum brings in the official onset of Autumn marked by declining temperatures. Notably, conditions remain fairly dry with rainfall averaging 0.79" (20mm). The sunlit hours reduce and cloud cover increases, indicating the approach of cooler days. Chilly mornings and evenings might require light layering of clothes. The shift in season is even more evident with the changing foliage and cooler winds setting in.Temperature
In the transition to September, Rathdrum observes a drop in the average high-temperature, moving from a moderately hot 82°F (27.8°C) in August to an agreeable 71.4°F (21.9°C). Rathdrum in September observes a sharp transition from the daytime heat, falling to an average low of 45°F (7.2°C).Humidity
The average relative humidity in September in Rathdrum is 58%.Rainfall
In September, in Rathdrum, the rain falls for 8.4 days. Throughout September, 0.79" (20mm) of precipitation is accumulated. 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. September is the first month it typically snows in Rathdrum. Throughout September, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow. In Rathdrum, during the entire year, snow falls for 71.8 days and aggregates up to 56.54" (1436mm) of snow.Daylight
In September, the average length of the day in Rathdrum, Idaho, is 12h and 33min.On the first day of the month, sunrise is at 6:07 am and sunset at 7:27 pm. On the last day of September, in Rathdrum, sunrise is at 6:46 am and sunset at 6:28 pm PDT.
Sunshine
In September, the average sunshine is 9.8h.UV index
In September, the average daily maximum UV index in Rathdrum is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: An average UV index of 4 in September transforms into this advice:
Make use of precautions - Suggestions to resist sunburn are communicated. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rathdrum, 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
Rathdrum, 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
Rathdrum, 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
Rathdrum, 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
Rathdrum, 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
Rathdrum, 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
Rathdrum, 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
Rathdrum, 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
Rathdrum, ID
- Average daylight in September: 12h and 36min
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 48min
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
Rathdrum, 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
Rathdrum, 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
Rathdrum, 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
Rathdrum, 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).
