September weather forecastButes, Guernsey
September
Weather in September
September's approach in Butes, Guernsey, nudges the climate progressively towards the onset of autumn. The month ushers in a palpable shift from the sweltering August highs, settling into more temperate highs and lows. Rainfall sees a minor increase, yet keeps a reasonable balance not to disrupt the overall pleasant weather. The decreasing daylight hours to 12.6 signal the slow decrease in temperature, preparing residents for the approaching winter season. September retains the charm of summer days while gradually introducing the tranquility of autumn nights.Temperature
Shifting into September, Butes records an average high-temperature of a still refreshing 17.1°C (62.8°F), presenting minor fluctuations compared to the previous month. September introduces a small decrease to a nighttime average of 15.4°C (59.7°F).Humidity
In September, the average relative humidity in Butes, Guernsey, is 80%.Rainfall
In September, in Butes, the rain falls for 13.6 days. Throughout September, 33mm (1.3") of precipitation is accumulated. Throughout the year, in Butes, there are 190.5 rainfall days, and 559mm (22.01") of precipitation is accumulated.Snowfall
In Butes, snow does not fall in February through October and December.Daylight
In Butes, the average length of the day in September is 12h and 36min.On the first day of the month, sunrise is at 06:25 and sunset at 19:52. On the last day of September, in Butes, sunrise is at 07:08 and sunset at 18:49 BST.
Sunshine
In September, the average sunshine is 8.5h.UV index
In Butes, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 4 during September translates into the following directions:
Undertake precautions - Guarding against sun damage is counselled. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Butes, Guernsey
- Average high temperature in September: 17.1°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 (8.9°C).
- Average low temperature in September: 15.4°C
The month with the highest average low temperature is August (16°C).
The coldest month (with the lowest average low temperature) is February (7.1°C).
Average pressure in September
Butes, Guernsey
- Average pressure in September: 1017.7mbar
The month with the highest atmospheric pressure is September (1017.7mbar).
The month with the lowest atmospheric pressure is November (1011.3mbar).
Average wind speed in September
Butes, Guernsey
- Average wind speed in September: 25.9km/h
The windiest month (with the highest average wind speed) is December (35.9km/h).
The calmest month (with the lowest average wind speed) is July (22km/h).
Average humidity in September
Butes, Guernsey
- Average humidity in September: 80%
The month with the highest relative humidity is June (85%).
The months with the lowest relative humidity are January, February, November and December (78%).
Average rainfall in September
Butes, Guernsey
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is November (84mm).
The driest months (with the least rainfall) are May and July (26mm).
Average rainfall days in September
Butes, Guernsey
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is November (22 days).
The month with the least rainy days is June (11.5 days).
Average snowfall in September
Butes, Guernsey
- Average snowfall in September: 0mm
The months with the highest snowfall are January and November (1mm).
The months with the least snowfall are February, March, April, May, June, July, August, September, October and December (0mm).
Average snowfall days in September
Butes, Guernsey
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September, October and December (0 days).
Average daylight in September /
Average sunshine in September
Butes, 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 30min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The months with the least sunshine are January, November and December (Average sunshine: 4h and 0min).
Average sunshine days in September
Butes, Guernsey
- Average sunshine days in September: 13.3 days
The month with the most sunshine days is May (17.7 days).
The month with the least sunshine days is November (4.7 days).
Average UV index in September
Butes, Guernsey
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 5).
The month with the lowest UV index is February (UV index 2).
Average cloud cover in September
Butes, Guernsey
- Average cloud cover in September: 40
The month with the most cloud cover is December (Cloud cover 62).
The month with the least cloud cover is July (Cloud cover 36).
Average visibility in September
Butes, 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).
