Winter nights in Monmouth are milder than in 90% of UK towns
The warmest part of a July day comes in at 21.9°C (71°F) on average. Warm days come often: about 15 a year reach 25°C, more than in 73% of UK towns. Temperatures cover 19°C across the year, low to high. Windscreens need scraping on about 35 mornings a year, the nights the air drops below 0°C.
Met Office 1991–2020 averages for the town itself.
A year in Monmouth at a glance
Each month’s typical high and low, in °C.
What a year in Monmouth feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 927 mm of rain a year
October is the wettest month and July the driest. About 27 days a year bring 10 mm (0.4 in) or more. 37th wettest of 38 Gwent towns of 2,500+.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Ross-on-Wye
35 air frosts and 15 days of 25°C a year
On about 35 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 15 days a year reach 25°C (77°F).
Day counts are 1991–2020 averages from the Met Office’s 2 km grid. The Met Office calls a day of 25°C or more a summer day and a night below 0°C an air frost; ground frosts, on grass, come more often.
The Met Office station at Ross-on-Wye
Ross-on-Wye is 8.9 miles north-east of Monmouth, 67 m (220 ft) above sea level. It is the nearest of the 37 long-running stations the Met Office publishes in full.
| Month | High | Low | Rain | Air frosts | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.0°C | 2.2°C | 76 mm | 9.0 | 55 |
| February | 8.7°C | 2.1°C | 55 mm | 8.4 | 77 |
| March | 11.2°C | 3.3°C | 53 mm | 4.9 | 118 |
| April | 14.2°C | 5.0°C | 55 mm | 2.0 | 165 |
| May | 17.4°C | 7.8°C | 57 mm | 0.1 | 202 |
| June | 20.3°C | 10.7°C | 56 mm | 0.0 | 201 |
| July | 22.3°C | 12.6°C | 52 mm | 0.0 | 209 |
| August | 21.7°C | 12.5°C | 64 mm | 0.0 | 188 |
| September | 19.1°C | 10.3°C | 57 mm | 0.0 | 143 |
| October | 14.8°C | 7.7°C | 85 mm | 1.2 | 104 |
| November | 10.9°C | 4.6°C | 80 mm | 4.5 | 63 |
| December | 8.3°C | 2.4°C | 79 mm | 8.8 | 47 |
| Year | 14.7°C | 6.8°C | 768 mm | 39 | 1,570 |
Met Office historic station data, Ross-On-Wye, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Monmouth compares
Against the 2,537 towns and cities of 2,500 or more across the UK, each with its own Met Office averages, and its place among Gwent towns that size.
Nearby towns’ climate
The nearest towns of 1,000+ within 12 miles: a hill, a valley or the sea can make a real difference over a few miles.
| Town | July high | January low | Rain a year |
|---|---|---|---|
| Monmouth | 21.9°C | 2.7°C | 927 mm |
| Berry Hill 4.1 mi | 21.8°C about the same | 1.9°C 0.8°C colder | 903 mm |
| Coleford 4.3 mi | 21.6°C about the same | 1.9°C 0.9°C colder | 1,036 mm |
| Broadwell and Coalway 5.1 mi | 20.9°C 1.1°C cooler | 1.6°C 1.2°C colder | 1,048 mm |
| Welsh Bicknor 6.1 mi | 21.3°C 0.6°C cooler | 1.8°C 1.0°C colder | 993 mm |
| Raglan 6.7 mi | 22.1°C about the same | 2.3°C about the same | 944 mm |
| Bream 7.4 mi | 22.0°C about the same | 2.0°C 0.7°C colder | 949 mm |
Monmouth weather by month
Average daily high and low, mean temperature and rain, 1991–2020, for the town itself (the Met Office’s HadUK-Grid).
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 8.0°C 46°F | 2.7°C 37°F | 5.4°C | 93 mm 3.6 in |
| February | 8.6°C 47°F | 2.5°C 37°F | 5.6°C | 72 mm 2.8 in |
| March | 11.1°C 52°F | 3.6°C 38°F | 7.3°C | 65 mm 2.6 in |
| April | 14.1°C 57°F | 5.4°C 42°F | 9.7°C | 63 mm 2.5 in |
| May | 17.0°C 63°F | 7.8°C 46°F | 12.4°C | 66 mm 2.6 in |
| June | 19.9°C 68°F | 10.7°C 51°F | 15.3°C | 62 mm 2.5 in |
| July | 21.9°C 71°F | 12.6°C 55°F | 17.2°C | 57 mm 2.2 in |
| August | 21.5°C 71°F | 12.4°C 54°F | 17.0°C | 76 mm 3.0 in |
| September | 18.7°C 66°F | 10.4°C 51°F | 14.5°C | 67 mm 2.6 in |
| October | 14.6°C 58°F | 7.8°C 46°F | 11.2°C | 103 mm 4.1 in |
| November | 10.7°C 51°F | 4.9°C 41°F | 7.8°C | 101 mm 4.0 in |
| December | 8.1°C 47°F | 2.6°C 37°F | 5.4°C | 103 mm 4.1 in |
| Year | 14.5°C | 6.9°C | 10.7°C | 927 mm |
Where Monmouth’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the 1 Met Office 2 km grid square whose centre lies inside Monmouth’s built-up area.
- Highs and lows: the Met Office publishes average daily maxima and minima on its 12 km grid; each is moved by the difference between the town’s 2 km mean temperature and the 12 km square’s, which carries the town’s own height and setting over.
- Weather station and sunshine: Met Office historic station data for Ross-On-Wye, 8.9 miles away, months of 1991–2020 averaged.
- Comparisons: every town and city of 2,500 or more across the UK, all four nations, read the same way.
Met Office HadUK-Grid · Met Office Climate Data Portal · Historic station data. Open Government Licence v3.0.
Questions about Monmouth’s climate
How warm does Monmouth get in summer?
July is the warmest month, with average highs of 21.9°C (71°F). About 15 days a year reach 25°C (77°F), more than 73% of UK towns.
How cold does Monmouth get in winter?
February nights average 2.5°C (37°F). The air drops below freezing on about 35 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Monmouth get?
About 927 mm (36 in) a year, more than 73% of UK towns. October is the wettest month (103 mm) and July the driest (57 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Ross-on-Wye (8.9 miles away), averages 1,570 hours of bright sunshine a year. Sunshine isn’t on the town grid, so this is the station’s figure.
Where do these figures come from?
The Met Office’s HadUK-Grid 1991–2020 averages, which turn thousands of weather stations into a map of the UK in 2 km squares; the page reads the squares inside Monmouth. They are 30-year averages, not a forecast.
Contains Met Office data © Crown copyright 2026, Open Government Licence v3.0. HadUK-Grid 1991–2020 averages via the Met Office Climate Data Portal; station averages from Met Office historic station data. Today’s forecast for Monmouth →
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.