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 heralds a minor drop in average high-temperature, sliding from August's 93.4°F (34.1°C) to a still tropical 87.4°F (30.8°C). Durham's average low-temperature of 59.9°F (15.5°C) in September reflects a considerable decline from the daytime peak.Humidity
In September, the average relative humidity in Durham is 35%.Rainfall
In Durham, in September, it is raining for 3.2 days, with typically 0.35" (9mm) of accumulated precipitation. Throughout the year, in Durham, there are 90.7 rainfall days, and 21.81" (554mm) of precipitation is accumulated.Snowfall
January through November are months without snowfall.Daylight
The average length of the day in September in Durham is 12h and 26min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:50 pm PDT.
Sunshine
In Durham, the average sunshine in September is 11.1h.UV index
In September, the average daily maximum UV index in Durham is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Exercise prevention - Protecting skin and eyes from harm is required. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
How hot is it in Durham in September?
What is the average humidity in September in Durham?
How much does it rain in Durham in September?
When it does not snow in Durham?
What is the average length of the day in September in Durham?
When is the sunrise / sunset in September in Durham?
How long on average sun shines in September in Durham?
What is the UV index intensity in September in Durham?
Average temperature in September
Durham, CA
- Average high temperature in September: 87.4°F
The warmest month (with the highest average high temperature) is July (95.2°F).
The month with the lowest average high temperature is December (53.2°F).
- Average low temperature in September: 59.9°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is December (39°F).
Average pressure in September
Durham, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Durham, CA
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is March (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in September
Durham, CA
- Average humidity in September: 35%
The month with the highest relative humidity is March (72%).
The month with the lowest relative humidity is July (32%).
Average rainfall in September
Durham, CA
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is February (3.94").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in September
Durham, CA
- Average rainfall days in September: 3.2 days
The month with the highest number of rainy days is March (15.2 days).
The month with the least rainy days is August (1.9 days).
Average snowfall in September
Durham, CA
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.12").
The months with the least snowfall are January, February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Durham, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (0.4 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Durham, CA
- 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 24min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The months with the least sunshine are January and December (Average sunshine: 5h and 54min).
Average sunshine days in September
Durham, CA
- Average sunshine days in September: 25.5 days
The month with the most sunshine days is August (28.1 days).
The month with the least sunshine days is March (14.9 days).
Average UV index in September
Durham, CA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Durham, CA
- Average cloud cover in September: 8
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Durham, CA
- 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).
Durham, California, USA
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