September weather forecastDuval, Guernsey
September
Weather in September
September signifies the onset of autumn, with the high temperature gently decreasing to 17.2°C (63°F). It continues to be warm but carries the crisp undertone typical of impending fall weather. Marked as a perfect blend of summer and autumn, it offers the residents a chance to enjoy the warm afternoons and cooler nights. The receding summer and incoming autumn assign September the duty of ushering in the change of seasons in Duval, Guernsey. It is a pleasant month overall, enabling the locals to savor the remaining warmth.Temperature
The commencement of September in Duval introduces an average high-temperature of a still enjoyable 17.2°C (63°F), closely mirroring the preceding month. Duval experiences a subtle drop in temperature during the September nights, recording an average of 15.4°C (59.7°F).Humidity
The average relative humidity in September in Duval is 80%.Rainfall
In Duval, during September, the rain falls for 13.5 days and regularly aggregates up to 31mm (1.22") of precipitation. Throughout the year, in Duval, there are 196.3 rainfall days, and 557mm (21.93") of precipitation is accumulated.Snowfall
In Duval, snow does not fall in February through December.Daylight
In Duval, the average length of the day in September is 12h and 36min.On the first day of September in Duval, sunrise is at 06:26 and sunset at 19:52. On the last day of the month, sunrise is at 07:08 and sunset at 18:50 BST.
Sunshine
In September, the average sunshine in Duval is 8.4h.UV index
The months with the highest UV index in Duval are July through September, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The daily maximum UV index of 5 in September interprets into the following advice:
Make use of precautions - It is urged to ward off sun damage. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Duval, 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
Duval, 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
Duval, 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
Duval, 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
Duval, 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
Duval, 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
Duval, 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
Duval, 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
Duval, 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 18min).
- 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
Duval, 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
Duval, 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
Duval, 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
Duval, 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).
