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 move into September indicates a reduction in the average high-temperature, down from August's moderately hot 75.7°F (24.3°C) to a refreshing 65.7°F (18.7°C). During September, Riggins notes a substantial drop from the daytime peak to an average minimum temperature of 39.7°F (4.3°C).Humidity
In Riggins, the average relative humidity in September is 55%.Rainfall
In Riggins, in September, it is raining for 7.7 days, with typically 1.06" (27mm) of accumulated precipitation. In Riggins, during the entire year, the rain falls for 81 days and collects up to 32.68" (830mm) of precipitation.Snowfall
January through December are months with snowfall. In September, it is snowing for 2.9 days. Throughout September, 2.32" (59mm) of snow is accumulated. Throughout the year, there are 160 snowfall days, and 210.63" (5350mm) of snow is accumulated.Daylight
In Riggins, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:07 am and sunset at 7:22 pm. On the last day of September, sunrise is at 6:43 am and sunset at 6:26 pm PDT.
Sunshine
In September, the average sunshine in Riggins is 8.9h.UV index
In Riggins, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 3 in September translates into this advice:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
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?
How much does it snow in September?
How many hours of daylight does Riggins have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Riggins, ID
- Average high temperature in September: 65.7°F
The warmest months (with the highest average high temperature) are July and August (75.7°F).
The month with the lowest average high temperature is December (25.3°F).
- Average low temperature in September: 39.7°F
The month with the highest average low temperature is August (45.7°F).
The coldest month (with the lowest average low temperature) is January (12°F).
Average pressure in September
Riggins, ID
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.23"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Riggins, ID
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is March (6mph).
The calmest months (with the lowest average wind speed) are May, June, August and September (5.3mph).
Average humidity in September
Riggins, ID
- Average humidity in September: 55%
The month with the highest relative humidity is February (94%).
The month with the lowest relative humidity is August (48%).
Average rainfall in September
Riggins, ID
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is February (4.49").
The driest month (with the least rainfall) is July (0.51").
Average rainfall days in September
Riggins, ID
- Average rainfall days in September: 7.7 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (1.8 days).
Average snowfall in September
Riggins, ID
- Average snowfall in September: 2.32"
The month with the highest snowfall is February (36.1").
The month with the least snowfall is August (0.08").
Average snowfall days in September
Riggins, ID
- Average snowfall days in September: 2.9 days
The month with the highest number of snowfall days is March (24.9 days).
The month with the least snowfall days is August (0.3 days).
Average daylight in September /
Average sunshine in September
Riggins, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in September
Riggins, ID
- Average sunshine days in September: 18.3 days
The month with the most sunshine days is July (22.3 days).
The months with the least sunshine days are February and March (6.3 days).
Average UV index in September
Riggins, ID
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, November and December (UV index 1).
Average cloud cover in September
Riggins, ID
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 73).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Riggins, ID
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (3mi).
Riggins, Idaho, USA
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