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No official flood warning is active nearby and the closest river stations are within normal ranges.
Updated 2026-10-10 04:45:45 UTC · Official GOV.UK warnings · Flood preparation & help guide
The Isle of Portland is a tied island, 6 kilometres (4 mi) long by 2.7 kilometres (1.7 mi) wide, in the English Channel. The southern tip, Portland Bill, lies 8 kilometres (5 mi) south of the resort of Weymouth, forming the southernmost point of the county of Dorset, England. A barrier beach called Chesil Beach joins Portland with mainland England. The A354 road passes down the Portland end of the beach and then over the Fleet Lagoon by bridge to the mainland. The population of Portland is 13,417.
Towns and villages near Portland with a page of their own: the homes in a flood risk area there, the nearest river gauges, and recorded floods.
Place names: Contains OS data © Crown copyright and database rights 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0.
The river map has no watercourse within 1 km of the middle of Portland's gauges.
That means this spot is not on the river map, not that there is no water here: Ordnance Survey’s river map (OS Open Rivers) leaves out small streams, ditches and culverts. Contains OS data © Crown copyright and database rights 2026.
Portland is monitored by 2 Environment Agency river level stations on the Dorset Coast, in Dorset. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The Dorset Coast is monitored by 2 stations (Chiswell, Portland). Each station records water levels continuously, with data synced to FloodRadar every 5 minutes.
There are 8 Environment Agency flood warning areas within 10km of Portland. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: Hamm Beach Road, Portland Beach Road Mereside, Coode Way, Castletown and Portland Port; A354 Chiswell, Brandy Row, Pebble Lane, Victoria Square up to the junction with Queens Road, the car parks along the A354 and the yard along Lerret Road; Chesil Bank and The Fleet Nature Reserve and Ferry Bridge Marine Services, Portland Beach Road; Cove Row and Street, Hope Street, Trinity Road and Street, Caroline Place, Commerical Road, Custom House Quay, Fredrick Place, Great George Street, Beaufort Garden Mews, St. Edmund Street, West Street, Westham Road and Wooperton Street in Weymouth.
There are 23 storm overflows within 5km of Portland. None of the 22 with a reporting monitor are currently discharging (1 has no live status right now). Enable "Sewage" on the map above to see their locations.
6 of them, nearest first, with their own page of live status and past discharges:
If flooding is forecast in Portland, call Floodline on 0345 988 1188 for the latest information. Move valuables upstairs, turn off gas and electricity if safe to do so, and avoid walking or driving through flood water. Sign up for flood warnings on any station page above to receive email alerts when water levels rise. For emergency numbers, a preparation checklist and insurance guidance, see our flood help & preparation guide.
Portland gets about 823 mm of rain a year on average (wettest month November, 103 mm; driest July, 46 mm). That is 29% drier than the UK as a whole, which averages 1,163 mm a year. See the rain gauges →
A thirty-year average for the area, not a forecast and not a flood risk on its own. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 1.9 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of the town centre — most recent first. These are records of mapped extents, not a full list of floods. See them on the map →
Records, not floods: no outline on the record is not evidence a place has not flooded.
Current verdict: Normal. No official flood warning is active nearby and the closest river stations are within normal ranges.
Portland has river level monitoring on Dorset Coast — 2 monitoring stations in total.
Use the GOV.UK Check for Flooding service (check-for-flooding.service.gov.uk) or call Floodline on 0345 988 1188 (24 hours). You can also set up free FloodRadar email or browser alerts from any station page above.
Follow official advice: move valuables and vehicles to safety, never walk or drive through flood water, turn off gas and electricity if safe, and check on vulnerable neighbours. See our flood preparation guide at floodradar.co.uk/flood-help.
Yes — the Environment Agency's Recorded Flood Outlines dataset shows 8 recorded flood extents around the town centre since 1703, most recently in 2014. That is a count of mapped extents, not of separate floods. Records, not floods: no outline on the record is not evidence a place has not flooded. See the flood history link below.
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