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 August shifts into September in Riggins, a slight alteration in temperatures is observed, with average highs reducing from a warm 75.7°F (24.3°C) to a comfortable 65.7°F (18.7°C). September nights present a stark temperature decrease to an icy 39.7°F (4.3°C).Humidity
In September, the average relative humidity in Riggins is 55%.Rainfall
In September, in Riggins, the rain falls for 7.7 days. Throughout September, 1.06" (27mm) of precipitation is accumulated. Throughout the year, in Riggins, there are 81 rainfall days, and 32.68" (830mm) of precipitation is accumulated.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 September in Riggins, sunrise is at 6:07 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:26 pm PDT.
Sunshine
In Riggins, the average sunshine in September is 8.9h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: A maximum high UV index of 3 in September translates into the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Frequently asked questions
What is the usual temperature for Riggins in September?
What is the average humidity in September in Riggins?
How many days does it rain in September in Riggins?
How many days does it snow in September in Riggins?
What is the average length of the day in September in Riggins?
What time are sunrise and sunset in September in Riggins?
How many hours of sunshine does Riggins have in September?
How high is the UV index in September in Riggins?
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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