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
Granby observes a small decrease in the average high-temperature with the arrival of September, falling from August's pleasant 71.2°F (21.8°C) to an enjoyable 64.4°F (18°C). Despite drastic daily temperature oscillations, Granby cools down to an average low-temperature of 36.9°F (2.7°C) in September.Humidity
In Granby, the average relative humidity in September is 52%.Rainfall
In Granby, Colorado, in September, it is raining for 7.1 days, with typically 0.59" (15mm) of accumulated precipitation. In Granby, during the entire year, the rain falls for 96.3 days and collects up to 11.54" (293mm) of precipitation.Snowfall
Months with snowfall in Granby, Colorado, are January through June, August through December. In Granby, in September, during 2 snowfall days, 0.87" (22mm) of snow is typically accumulated. In Granby, during the entire year, snow falls for 110.7 days and aggregates up to 59.88" (1521mm) of snow.Daylight
The average length of the day in September in Granby is 12h and 26min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:34 pm. On the last day of September, in Granby, Colorado, sunrise is at 6:59 am and sunset at 6:47 pm MDT.
Sunshine
In September, the average sunshine is 11.2h.UV index
In September, the average daily maximum UV index in Granby is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: A maximum high UV index of 3 in September translates into the following recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Frequently asked questions
What is the temperature in September in Granby?
What is the average humidity in September in Granby?
How much does it rain in Granby in September?
How much does it snow in Granby in September?
How many hours of daylight does Granby have in September?
When is the sunrise / sunset in September in Granby?
How long on average sun shines in September in Granby?
What is the UV index reading in September in Granby?
Average temperature in September
Granby, CO
- Average high temperature in September: 64.4°F
The warmest month (with the highest average high temperature) is July (72.3°F).
The month with the lowest average high temperature is December (24.6°F).
- Average low temperature in September: 36.9°F
The month with the highest average low temperature is July (43.7°F).
The coldest month (with the lowest average low temperature) is January (4.3°F).
Average pressure in September
Granby, CO
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are April, May and June (29.93"Hg).
Average wind speed in September
Granby, CO
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is February (7mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Granby, CO
- Average humidity in September: 52%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is June (49%).
Average rainfall in September
Granby, CO
- Average rainfall in September: 0.59"
The wettest month (with the highest rainfall) is May (1.73").
The driest month (with the least rainfall) is August (0.55").
Average rainfall days in September
Granby, CO
- Average rainfall days in September: 7.1 days
The month with the highest number of rainy days is May (12.8 days).
The month with the least rainy days is October (4.9 days).
Average snowfall in September
Granby, CO
- Average snowfall in September: 0.87"
The month with the highest snowfall is April (10.94").
The month with the least snowfall is July (0").
Average snowfall days in September
Granby, CO
- Average snowfall days in September: 2 days
The month with the highest number of snowfall days is February (16.1 days).
The month with the least snowfall days is July (0 days).
Average daylight in September /
Average sunshine in September
Granby, CO
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 11h and 1min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).
Average sunshine days in September
Granby, CO
- Average sunshine days in September: 19.5 days
The months with the most sunshine days are September and November (19.5 days).
The month with the least sunshine days is May (9.5 days).
Average UV index in September
Granby, CO
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Granby, CO
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is September (Cloud cover 15).
Average visibility in September
Granby, CO
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April and December (5mi).
Granby, Colorado, USA
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