September weather forecastGolden, CO
September
Weather in September
September marks the commencement of autumn in Golden. Temperatures commence their downward journey, falling to 73°F (22.8°C) from the summer peaks. This month witnesses a sizable reduction in rainfall, being the driest month of the year, indicating the receding monsoons. The decrease in days' length and relative increase in humidity signifies the end of summer. The decline of temperature and light create the ideal autumnal atmosphere of cool, crisp days and chilly nights.Temperature
Golden observes a small decrease in the average high-temperature with the arrival of September, falling from August's moderately hot 79.3°F (26.3°C) to an agreeable 73°F (22.8°C). Golden anticipates a stark contrast in temperature during September nights, with an average low of 48.7°F (9.3°C).Humidity
The average relative humidity in September in Golden is 45%.Rainfall
In Golden, in September, it is raining for 11.8 days, with typically 1.02" (26mm) of accumulated precipitation. Throughout the year, there are 141.9 rainfall days, and 17.32" (440mm) of precipitation is accumulated.Snowfall
In Golden, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:31 pm. On the last day of September, in Golden, Colorado, sunrise is at 6:56 am and sunset at 6:44 pm MDT.
Sunshine
In September, the average sunshine in Golden is 11.1h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 4 during September translates into these guidelines:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Golden, CO
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is December (36.5°F).
- Average low temperature in September: 48.7°F
The month with the highest average low temperature is July (56.3°F).
The coldest months (with the lowest average low temperature) are February and December (18.3°F).
Average pressure in September
Golden, CO
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are April, May and June (29.92"Hg).
Average wind speed in September
Golden, CO
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is January (6.7mph).
The calmest month (with the lowest average wind speed) is September (5.4mph).
Average humidity in September
Golden, CO
- Average humidity in September: 45%
The month with the highest relative humidity is February (70%).
The month with the lowest relative humidity is June (43%).
Average rainfall in September
Golden, CO
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is May (2.99").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in September
Golden, CO
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is July (21.6 days).
The month with the least rainy days is November (5 days).
Average snowfall in September
Golden, CO
- Average snowfall in September: 0"
The month with the highest snowfall is March (9.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Golden, CO
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (12.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Golden, 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 6min
The months with the most sunshine are June, July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).
Average sunshine days in September
Golden, CO
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is July (5.4 days).
Average UV index in September
Golden, 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, October, November and December (UV index 2).
Average cloud cover in September
Golden, CO
- Average cloud cover in September: 15
The months with the most cloud cover are April and May (Cloud cover 27).
The month with the least cloud cover is September (Cloud cover 15).
Average visibility in September
Golden, CO
- 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).
