September weather forecastNew Castle, CO
September
Weather in September
September, the first month of the autumn in New Castle, is also an agreeable month, with an average temperature fluctuating between 43.9°F (6.6°C) and 70.9°F (21.6°C).Temperature
The transition into September involves a small decrease in the average high-temperature, dipping slightly from a moderately hot 78.4°F (25.8°C) in August to a pleasant 70.9°F (21.6°C). New Castle measures a considerable dip from daytime highs with an average low-temperature of 43.9°F (6.6°C) during September.Humidity
In September, the average relative humidity is 48%.Rainfall
September is the month with the least rainfall in New Castle. Rain falls for 7.9 days and accumulates 0.51" (13mm) of precipitation.Snowfall
June through September are months without snowfall in New Castle, Colorado.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:40 pm. On the last day of September, in New Castle, sunrise is at 7:06 am and sunset at 6:53 pm MDT.
Sunshine
The average sunshine in September in New Castle is 11h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, a daily UV index of 4 turns into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
New Castle, CO
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in September: 43.9°F
The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is January (12°F).
Average pressure in September
New Castle, CO
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is May (29.93"Hg).
Average wind speed in September
New Castle, CO
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is June (6.2mph).
The calmest month (with the lowest average wind speed) is January (4.1mph).
Average humidity in September
New Castle, CO
- Average humidity in September: 48%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is June (43%).
Average rainfall in September
New Castle, CO
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is April (1.57").
The driest month (with the least rainfall) is September (0.51").
Average rainfall days in September
New Castle, CO
- Average rainfall days in September: 7.9 days
The month with the highest number of rainy days is April (14 days).
The month with the least rainy days is June (5.9 days).
Average snowfall in September
New Castle, CO
- Average snowfall in September: 0"
The month with the highest snowfall is February (8.74").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
New Castle, CO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
New Castle, CO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 11h and 0min
The months with the most sunshine are June, July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 6h and 6min).
Average sunshine days in September
New Castle, CO
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is June (20.7 days).
The month with the least sunshine days is April (11.7 days).
Average UV index in September
New Castle, CO
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
New Castle, CO
- Average cloud cover in September: 12
The month with the most cloud cover is February (Cloud cover 39).
The months with the least cloud cover are June and September (Cloud cover 12).
Average visibility in September
New Castle, CO
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
