We've had a very wet few days, with more rain to come this week. So far, there has been about 72mm rainfall since Sunday 22 September. that's not too far short of twice the rain we had for the whole month of September last year and more than we'd expect in most months.
it's not unusual for it to rain in the autumn. Atlantic Cyclones start to track over the UK after summer weather patterns have pushed them northwards and it is not uncommon for the remnants of Atlantic Hurricanes and Tropical Storms to be mixed up with them, as has happened this time. The vast amounts of moisture and energy transported out of the tropics by these mighty systems is enormous.