Portsmouth weather: Hour by hour forecast as "heavy" rain and "thundery" conditions set to hit city

The Met Office has issued a yellow weather warning for rain this evening (September 4). It will be in place from 9pm today until 9am tomorrow morning.

The forecaster said heavy showers, perhaps thundery, are possible in places. “Whilst there is some uncertainty, and not all areas will be affected, scattered heavy showers on Wednesday evening may merge into longer spells of heavy, showery rain in places through Wednesday night into Thursday morning,” the Met Office said.

“Where heavy downpours occur, perhaps thundery in places, accumulations of 20-40 mm are possible in an hour or two, with the small chance of isolated accumulations over 50 mm, potentially impacting the Thursday morning commute in some areas.” Spray and flooding could cause difficult driving conditions and road closures, alongside disruption on rail and bus services, the Met Office said.

They added that there is a small chance of power cuts, damage to buildings alongside lightning strikes and strong winds. “There is a small chance of fast flowing or deep floodwater causing danger to life,” they said. Here is the current Met Office forecast today. Much of the rain is expected tonight and into tomorrow morning.

Hour by hour Portsmouth forecast

8am - cloudy - 14C - less than 5 per cent chance of rain

9am - cloudy - 15C - less than 5 per cent chance of rain

10am - cloudy - 16C - 10 per cent chance of rain

11am - cloudy - 16C - 20 per cent chance of rain

12pm - overcast - 17C - 20 per cent chance of rain

1pm - overcast - 17C - 40 per cent chance of rain

2pm - overcast - 18C - 40 per cent chance of rain

3pm - light rain - 17C - 50 per cent chance of rain

4pm - cloudy - 17C - 50 per cent chance of rain

5pm - cloudy - 17C - 50 per cent chance of rain

6pm - cloudy - 17C - 40 per cent chance of rain

7pm - cloudy - 16C - 50 per cent chance of rain

8pm - cloudy - 15C - 50 per cent chance of rain

9pm - light showers - 15C - 50 per cent chance of rain

10pm - cloudy - 15C - 50 per cent chance of rain

11pm - cloudy - 14C - 50 per cent chance of rain