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
September ushers in a minute temperature change, with average high-temperatures reducing from August's moderately hot 75.9°F (24.4°C) to a pleasant 70.5°F (21.4°C). Throughout September, Larkspur acknowledges a distinct difference between its daytime highs and the steady low average of 47.3°F (8.5°C).Humidity
In September, the average relative humidity is 51%.Rainfall
In Larkspur, in September, it is raining for 11.5 days, with typically 1.38" (35mm) of accumulated precipitation. Throughout the year, in Larkspur, there are 117.5 rainfall days, and 19.41" (493mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 68.6 snowfall days, and 50.51" (1283mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:28 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:43 pm MDT.
Sunshine
In September, the average sunshine is 10.8h.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 the average person.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How many days does it rain in September in Larkspur?
When does it start to snow?
How many hours of daylight does Larkspur have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Larkspur, CO
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is December (36°F).
- Average low temperature in September: 47.3°F
The month with the highest average low temperature is July (54°F).
The coldest month (with the lowest average low temperature) is December (17.1°F).
Average pressure in September
Larkspur, CO
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is April (29.91"Hg).
Average wind speed in September
Larkspur, CO
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is April (8.2mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in September
Larkspur, CO
- Average humidity in September: 51%
The month with the highest relative humidity is February (69%).
The month with the lowest relative humidity is June (48%).
Average rainfall in September
Larkspur, CO
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is May (3.31").
The driest months (with the least rainfall) are January, November and December (0.63").
Average rainfall days in September
Larkspur, CO
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is July (18.6 days).
The month with the least rainy days is November (3.6 days).
Average snowfall in September
Larkspur, CO
- Average snowfall in September: 0.08"
The month with the highest snowfall is April (9.29").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Larkspur, CO
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (11.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Larkspur, CO
- Average daylight in September: 12h and 2min
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 30min).
- Average sunshine in September: 10h and 5min
The months with the most sunshine are June and July (Average sunshine: 11h and 36min).
The month with the least sunshine is February (Average sunshine: 6h and 30min).
Average sunshine days in September
Larkspur, CO
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is November (21.7 days).
The month with the least sunshine days is May (9.5 days).
Average UV index in September
Larkspur, 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
Larkspur, CO
- Average cloud cover in September: 19
The months with the most cloud cover are April and May (Cloud cover 30).
The months with the least cloud cover are September, October and November (Cloud cover 19).
Average visibility in September
Larkspur, 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).
Larkspur, Colorado, USA
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