September weather forecastCobo, Guernsey
September
Weather in September
September witnesses a climatic shift as Cobo, Guernsey, starts stepping into autumn. While the high temperatures stick around at 17.2°C (63°F), the rainfall also sees an increase moving up to 31mm (1.22"). With a decrease in daylight hours, evenings come in early, manifesting the onset of the autumn season. The weather is characterized by crisp mornings, warm afternoons and cool evenings. Wind speed starts to increase, bringing in waves of cooler air, slowly transforming the weather pattern.Temperature
September's beginning signals an average high-temperature of a still enjoyable 17.2°C (63°F), barely different from August's 17.8°C (64°F). Cobo's nocturnal September readings average at a moderate 15.4°C (59.7°F), showing little variation from the daytime temperatures.Humidity
In Cobo, the average relative humidity in September is 80%.Rainfall
In Cobo, Guernsey, in September, it is raining for 13.5 days, with typically 31mm (1.22") of accumulated precipitation. Throughout the year, there are 196.3 rainfall days, and 557mm (21.93") of precipitation is accumulated.Snowfall
In Cobo, snow does not fall in February through December.Daylight
In Cobo, the average length of the day in September is 12h and 36min.On the first day of September in Cobo, sunrise is at 06:27 and sunset at 19:53. On the last day of the month, sunrise is at 07:09 and sunset at 18:50 BST.
Sunshine
In September, the average sunshine is 8.4h.UV index
The months with the highest UV index are July through September, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cobo, Guernsey
- Average high temperature in September: 17.2°C
The warmest month (with the highest average high temperature) is August (17.8°C).
The month with the lowest average high temperature is February (9.2°C).
- Average low temperature in September: 15.4°C
The month with the highest average low temperature is August (15.8°C).
The coldest month (with the lowest average low temperature) is February (7°C).
Average pressure in September
Cobo, Guernsey
- Average pressure in September: 1017.9mbar
The month with the highest atmospheric pressure is September (1017.9mbar).
The month with the lowest atmospheric pressure is November (1011.5mbar).
Average wind speed in September
Cobo, Guernsey
- Average wind speed in September: 25.8km/h
The windiest month (with the highest average wind speed) is December (36km/h).
The calmest month (with the lowest average wind speed) is July (21.9km/h).
Average humidity in September
Cobo, Guernsey
- Average humidity in September: 80%
The months with the highest relative humidity are June and July (84%).
The months with the lowest relative humidity are November and December (77%).
Average rainfall in September
Cobo, Guernsey
- Average rainfall in September: 31mm
The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is July (26mm).
Average rainfall days in September
Cobo, Guernsey
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is November (22.8 days).
The month with the least rainy days is June (11.5 days).
Average snowfall in September
Cobo, Guernsey
- Average snowfall in September: 0mm
The month with the highest snowfall is January (2mm).
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Cobo, Guernsey
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Cobo, Guernsey
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 12min).
- Average sunshine in September: 8h and 24min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January, November and December (Average sunshine: 3h and 54min).
Average sunshine days in September
Cobo, Guernsey
- Average sunshine days in September: 13.1 days
The month with the most sunshine days is May (16.3 days).
The month with the least sunshine days is November (4 days).
Average UV index in September
Cobo, Guernsey
- Average UV index in September: 5
The months with the highest UV index are July, August and September (UV index 5).
The month with the lowest UV index is February (UV index 2).
Average cloud cover in September
Cobo, Guernsey
- Average cloud cover in September: 41
The months with the most cloud cover are November and December (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in September
Cobo, Guernsey
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
