Country Overview For United Kingdom
The climate in United Kingdom is typically temperate; moderated by prevailing southwest winds over the North Atlantic Current; more than one-half of the days are overcast. The terrain: mostly rugged hills and low mountains; level to rolling plains in east and southeast. For London in January the daily average maximum temperatures is 7°C with the average minimum 3°C, while in June the average maximum is 19°C with a minimum of 11°C. The wettest month for London is October with an average of 87.3mm of precipitation falling while the driest month is March with 46.0mm falling.
HISTORICAL MONTHLY AVERAGES FOR SEPTEMBER
The information presented below gives detailed historical monthly average weather conditions along with exceptional weather occurrences. To maintain relevance to current weather trends the displayed information has been calculated using data collected over the past two decades. The climate profile is taken from closest available data source to Caldey Island.
Throughout the month of September daytime temperatures will generally reach highs of around 17°C that's about 63°F. At night the average minimum temperature drops down to around 10°C, that's 50°F.
In recent times the highest recorded temperature in September has been 25°C that's 77°F, with the lowest recorded temperature 2°C, about 36°F.
The average daily relative humidity for September is around 82%.
The Heat Index is a measure of how hot it feels when relative humidity is added to actual air temperature. From this a comfort level is calculated providing categories on how heat conditions might adversely affect someone.
Comfort Levels: Given average maximum temperatures and humidity levels generally you should not anticipate any discomfort from heat (see heat index for more information).
The average daily wind speed in September has been around 13 km/h, that’s the equivalent to about 8 mph, or 7 knots. In recent years the maximum sustained wind speed has reached 44 km/h, that’s the equivalent of around 28 mph, or 24 knots.
YEARLY TRENDS: WEATHER AVERAGES & EXTREMES
The following charts show yearly weather trends with information on monthly weather averages and extremes.
The chart below plots the average high and low temperature for each month of the year. It also shows the maximum and minimum recorded temperatures.
The chart below plots the average daily wind speed you can expect for any month. It also shows the maximum recorded sustained wind speed for each month.