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 beginning of September marks a decrease in the average high-temperature, transitioning from a hot 88.2°F (31.2°C) in August to a warm 77.4°F (25.2°C). During September, Castleford's temperature records a considerable difference from its daily highs to an average low of 54.9°F (12.7°C).Humidity
In September, the average relative humidity is 34%.Rainfall
In Castleford, Idaho, during September, the rain falls for 5.9 days and regularly aggregates up to 0.35" (9mm) of precipitation. In Castleford, during the entire year, the rain falls for 85.9 days and collects up to 8.27" (210mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 7:05 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 7:21 pm MDT.
Sunshine
The average sunshine in September is 9.5h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
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 much does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September in Castleford?
When are sunrise and sunset in September?
How many hours of sunshine does Castleford have in September?
What is the UV index intensity in September?
Average temperature in September
Castleford, ID
- Average high temperature in September: 77.4°F
The warmest month (with the highest average high temperature) is July (89.8°F).
The month with the lowest average high temperature is December (34.2°F).
- Average low temperature in September: 54.9°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is December (22.8°F).
Average pressure in September
Castleford, ID
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Castleford, ID
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (7.2mph).
Average humidity in September
Castleford, ID
- Average humidity in September: 34%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is July (27%).
Average rainfall in September
Castleford, ID
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is January (1.18").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in September
Castleford, ID
- Average rainfall days in September: 5.9 days
The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is October (5.2 days).
Average snowfall in September
Castleford, ID
- Average snowfall in September: 0"
The month with the highest snowfall is January (5").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Castleford, ID
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Castleford, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Castleford, ID
- Average sunshine days in September: 22.1 days
The month with the most sunshine days is October (24.5 days).
The month with the least sunshine days is February (16.1 days).
Average UV index in September
Castleford, ID
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Castleford, ID
- Average cloud cover in September: 13
The month with the most cloud cover is December (Cloud cover 39).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in September
Castleford, ID
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Castleford, Idaho, USA
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