Porthmadog (Gwynedd) weather

Headline:

An unsettled start to Autumn.

Today:

A wet start to Monday with heavy band of organised showers. These turning most isolated through the morning and potentially turning heavy and thundery at times. Sunny spells in between but staying breezy, especially near coasts. Temperatures near average. Maximum temperature 18 °C.

Tonight:

Clear spells for most overnight with the odd isolated shower. Staying blustery but winds dying down by dawn where a risk of more persistent rain moves into the south. Minimum temperature 15 °C.

Tuesday:

Heavy rain and low cloud tracks eastwards across the south of the country, with blustery conditions through the Bristol Channel. Elsewhere winds a lot lighter than in previous days. Maximum temperature 19 °C.

Outlook for Wednesday to Friday:

Remaining unsettled throughout with further spells of rain and showers. The rain will be heavy at times, but some drier and sunnier interludes will develop. Temperatures around average.

Changeable weather conditions are expected across the UK during this period with low pressure systems tending to dominate the overall pattern. This will mean showers or longer spells of rain will affect much of the UK at times. Some heavy rain or showers are expected in places, most often in the west. Thunderstorms and hail are also possible, as are some spells of strong winds if any deep areas of low pressure form in the vicinity of the UK. Some short-lived spells of drier and more settled weather are also possible at times, especially early and again late in the period, when they may last a little longer. Temperatures will likely be close to average or slightly below overall, but may rise above at times in any drier, sunnier spells.

Low pressure is likely to dominate much of this period, bringing changeable weather conditions with showers or some longer spells of rain at times. There will likely be some drier, more settled interludes, particularly at the start of the period. Temperatures are likely to be close to average, perhaps turning warmer than average later in the period.