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's arrival comes with a mild decrease in the average high-temperature, moving subtly from a moderately hot 79.5°F (26.4°C) in August to a pleasant 72.3°F (22.4°C). Jamestown documents a substantial deviation from daytime highs with a consistent low-temperature of 47.8°F (8.8°C) during September nights.Humidity
June, August and September, with an average relative humidity of 45%, are the least humid months in Jamestown.Rainfall
In Jamestown, in September, during 9.9 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. In Jamestown, during the entire year, the rain falls for 117.3 days and collects up to 14.17" (360mm) of precipitation.Snowfall
In Jamestown, snow does not fall in June through September.Daylight
The average length of the day in September in Jamestown is 12h and 26min.On the first day of September, sunrise is at 6:30 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm MDT.
Sunshine
The average sunshine in September in Jamestown is 10.9h.UV index
The average daily maximum UV index in September in Jamestown, Colorado, is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: A maximum UV index of 4 in September translates into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
What is the average September temperature in Jamestown?
What are the least humid months in Jamestown?
What is the average humidity in September in Jamestown?
How many days does it rain in September in Jamestown?
When it does not snow in Jamestown?
Does it snow in Jamestown in September?
What is the average length of the day in September in Jamestown?
When is the sunrise / sunset in September in Jamestown?
How long on average sun shines in September in Jamestown?
How high is the UV index in September in Jamestown?
Average temperature in September
Jamestown, CO
- Average high temperature in September: 72.3°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is December (35.2°F).
- Average low temperature in September: 47.8°F
The month with the highest average low temperature is July (55.2°F).
The coldest month (with the lowest average low temperature) is February (18°F).
Average pressure in September
Jamestown, 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
Jamestown, CO
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is January (7.3mph).
The calmest months (with the lowest average wind speed) are May, July, August and September (5.7mph).
Average humidity in September
Jamestown, CO
- Average humidity in September: 45%
The month with the highest relative humidity is February (70%).
The months with the lowest relative humidity are June, August and September (45%).
Average rainfall in September
Jamestown, CO
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is May (2.48").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in September
Jamestown, CO
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (3.3 days).
Average snowfall in September
Jamestown, CO
- Average snowfall in September: 0"
The month with the highest snowfall is April (7.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Jamestown, CO
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Jamestown, 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: 10h and 5min
The months with the most sunshine are June and July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).
Average sunshine days in September
Jamestown, CO
- Average sunshine days in September: 17.6 days
The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is July (9.9 days).
Average UV index in September
Jamestown, 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, November and December (UV index 2).
Average cloud cover in September
Jamestown, CO
- Average cloud cover in September: 16
The months with the most cloud cover are April and May (Cloud cover 28).
The month with the least cloud cover is September (Cloud cover 16).
Average visibility in September
Jamestown, 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).
Jamestown, Colorado, USA
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