Saturday 26th September
After a slow start, due to variable cloud on Friday morning, the sun became quite hot in the afternoon that lifted the temperature to a peak of 22.6C at 16.07, which was again above the September average at +3.6C. However, the opposite occurred overnight with the temperature slowly falling away during the early hours and then quickly dropping to a minimum of 5.1C in the hour before dawn that was a significant 4.4C below average, which made it the coldest night this month and in fact since 12th May. The cold front that passed over around midday had cleared in the evening that resulted in a clear sky, there was also a lack of any breeze to stir up the atmosphere after 01.00.
Radiation fog formed in the River Og and River Kennet valleys before dawn that only began to thin after the sun rose above the horizon at 06.59 and had totally evaporated just after 08.00. Today will be the best day of the weekend with a sunny morning and variable cloud limiting the sunshine this afternoon. The high pressure is hanging on today, hence the fine weather.
Two weather fronts will arrive later on Sunday afternoon that might produce a little precipitation, however, it will be a cloudy day with the advance cloud in the morning thickening after around midday.
Monday will see a return to fine dry weather as the high pressure makes a brief reappearance, centred over the English Channel. However, brewing to the west of Ireland, with more certainty now, will be a very deep low pressure system that will see winds strengthening considerably, especially to the west of the UK, heralding the start of a more unsettled period. The centre of the low is forecast to have very low-pressure of 957mb. The thinking at the moment is that the depression might be blocked from crossing the country by the high pressure still to the east over Scandinavia and near Continent.
The Harvest Moon is the full moon that happens closest to the start of autumn. It is so called because traditionally this time of year was when crops were harvested and a nice bright full moon meant that you could work well into the evening.