FloodRadar
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NRW has no flood warnings or alerts in force in Wales. Last successful check: 2026-09-20 06:48:01 UTC.
No current NRW warning or alert matched the location of Grosmont Rhosllwyn River Station. That does not establish warning coverage for the whole town: only these gauge points were checked.
Read Wales’s warnings · Check your area on Natural Resources Wales
Messages: Natural Resources Wales flood warnings API. Warning-area boundaries: Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Reused under the Open Government Licence v3.0. Boundaries from DataMapWales.
No official flood warning is active nearby and the closest river stations are within normal ranges.
Updated 2026-09-20 06:50:58 UTC · Official GOV.UK warnings · Flood preparation & help guide
Grosmont is monitored by 1 Environment Agency river level station on the Monnow, in Herefordshire County of. Water levels are updated every 15 minutes.
Flood Zones, Warning Areas and Surface Water are Environment Agency maps and cover England only. Grosmont is in Wales, so they draw little or nothing here — that is where the map ends, not an absence of flood risk. Natural Resources Wales’s warning areas have their own pages under flood areas.
Grosmont is monitored by 1 Environment Agency river level station on the Monnow, in Herefordshire County of. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The Monnow is monitored by 1 station (Grosmont Rhosllwyn River Station). Each station records water levels continuously, with data synced to FloodRadar every 5 minutes.
There are 2 Environment Agency flood warning areas within 10km of Grosmont. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: Dulas Brook at Ewyas Harold; River Monnow and tributaries in England.
There is 1 storm overflow within 5km of Grosmont. None are currently discharging. Enable "Sewage" on the map above to see their locations.
If flooding is forecast in Grosmont, 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.
Grosmont gets about 940 mm of rain a year on average (wettest month December, 106 mm; driest April, 61 mm). That is 19% 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), 2.5 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.
Grosmont has river level monitoring on Monnow — 1 monitoring station 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 2 recorded flood extents around the town centre since 1703, most recently in 1947. 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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