Fan Brycheiniog - Twr y Fan Foel weather tomorrow, this weekend and 14-day summit forecast
803 m · Carmarthen to Vale of Neath · OS grid SN824220
Fan Brycheiniog is the highest point of the Black Mountain in the western Brecon Beacons, a long escarpment above Llyn y Fan Fawr.
Fan Brycheiniog - Twr y Fan Foel today (updated 02:37, 18 Oct): up to 7°C at the summit, feeling as cold as -2°C, summit wind 36 mph gusting 45 mph, 67% chance of rain. A marginal day for the hills. Best day this week: Tuesday, summit gusts 33 mph.
Fan Brycheiniog - Twr y Fan Foel weather today, tomorrow and this weekend
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Marginal Today Monday 19 October
Slight rain, up to 7°C at the summit, feeling as cold as -2°C, summit wind 36 mph gusting 45 mph, 67% chance of rain. Rated Marginal. Sunrise 07:46, sunset 18:13.
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Marginal Tomorrow Tuesday 20 October
Overcast, up to 8°C at the summit, feeling as cold as -5°C, summit wind 26 mph gusting 33 mph, 59% chance of rain. Rated Marginal. Sunrise 07:48, sunset 18:11.
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Poor Saturday 24 October
Slight rain, up to 5°C at the summit, feeling as cold as -4°C, summit wind 47 mph gusting 58 mph, 75% chance of rain. Rated Poor. Sunrise 07:55, sunset 18:02.
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Marginal Sunday 25 October
Light drizzle, up to 10°C at the summit, feeling as cold as -2°C, summit wind 31 mph gusting 39 mph, 77% chance of rain. Rated Marginal. Sunrise 06:57, sunset 17:00.
Best day of the next seven: Tuesday 20 October, with summit gusts around 33 mph and a 59% chance of rain. Peakify picks it as the day with the lightest gusts, after a penalty for any chance of rain over 40%.
Fan Brycheiniog - Twr y Fan Foel 14-day summit weather forecast
Every day the cache holds from today, at summit height. Temperatures in °C, wind and gusts in mph, rain as the day's highest chance. Days 8 to 14 are marked less certain: forecasts lose skill quickly beyond a week, so read them as a trend.
| Day | Verdict | Weather | High / low | Feels like | Wind / gust | Rain | Snow |
|---|---|---|---|---|---|---|---|
| Today | Marginal | Slight rain | 7° / 2° | -2° | 36 / 45 mph | 67% | — |
| Tomorrow | Marginal | Overcast | 8° / -3° | -5° | 26 / 33 mph | 59% | — |
| Wed 21 Oct | Marginal | Slight rain | 4° / -3° | -6° | 38 / 47 mph | 80% | — |
| Thu 22 Oct | Marginal | Slight rain | 7° / 3° | -2° | 31 / 38 mph | 78% | — |
| Fri 23 Oct | Poor | Light drizzle | 5° / 0° | -4° | 40 / 50 mph | 87% | — |
| Sat 24 Oct | Poor | Slight rain | 5° / 0° | -4° | 47 / 58 mph | 75% | — |
| Sun 25 Oct | Marginal | Light drizzle | 10° / 2° | -2° | 31 / 39 mph | 77% | — |
| Days 8 to 13: less certain | |||||||
| Mon 26 Oct | Poor (less certain) | Moderate rain showers | 11° / 8° | 5° | 49 / 61 mph | 75% | — |
| Tue 27 Oct | Marginal (less certain) | Moderate rain showers | 11° / 2° | -1° | 38 / 48 mph | 74% | — |
| Wed 28 Oct | Good (less certain) | Overcast | 7° / 2° | -2° | 22 / 27 mph | 53% | — |
| Thu 29 Oct | Good (less certain) | Overcast | 7° / 2° | 0° | 20 / 25 mph | 40% | — |
| Fri 30 Oct | Good (less certain) | Moderate drizzle | 9° / 2° | -1° | 22 / 27 mph | 38% | — |
| Sat 31 Oct | Poor (less certain) | Light drizzle | 10° / 6° | 4° | 41 / 51 mph | 41% | — |
The cached forecast has no freezing level; snow is the model's summit snowfall for the day.
How the Fan Brycheiniog - Twr y Fan Foel summit forecast is made
The numbers come from the Open-Meteo weather model for the summit's position at 803 m, in the mountain's local time. A valley forecast would understate the summit badly, so the wind is worked out at summit height from the model's upper-air winds: the standard 10 m wind sits over the model's smoothed ground and is roughly half what an exposed top gets.
Peakify rates each day Good, Marginal or Poor from the forecast summit wind, gusts, chance of rain and wind chill. Wind of 40 mph or gusts of 65 mph make it Poor; wind of 25 mph, gusts of 45 mph, a 60% chance of rain or a feels-like temperature of -8°C or below make it Marginal. The verdict is the same one shown on the main peak page and in the Peakify app.
"Feels like" is the coldest apparent temperature of the day, which combines air temperature, wind and humidity. On a windy summit it can be well below the air temperature, so pack for that figure, not the high.
For a second opinion before a big day, read the Met Office mountain forecast or MWIS for the area. They are written by forecasters and cover hazards such as cloud on the tops and visibility that a model table can't.
Questions about Fan Brycheiniog - Twr y Fan Foel
What is the Fan Brycheiniog - Twr y Fan Foel weather tomorrow?
Tuesday 20 October: overcast, up to 8°C at the summit, feeling as cold as -5°C, summit wind 26 mph gusting 33 mph, 59% chance of rain. Rated Marginal.
What is the Fan Brycheiniog - Twr y Fan Foel weather this weekend?
Saturday 24 October: slight rain, up to 5°C at the summit, feeling as cold as -4°C, summit wind 47 mph gusting 58 mph, 75% chance of rain. Rated Poor. Sunday 25 October: light drizzle, up to 10°C at the summit, feeling as cold as -2°C, summit wind 31 mph gusting 39 mph, 77% chance of rain. Rated Marginal.
Is there a 14-day Fan Brycheiniog - Twr y Fan Foel weather forecast?
Yes. This page lists up to 14 days of summit weather for Fan Brycheiniog - Twr y Fan Foel, each with a Good, Marginal or Poor verdict. Days 8 to 14 are less certain: use them to spot a settled or stormy spell, not to plan a day.
Where does the Fan Brycheiniog - Twr y Fan Foel summit forecast come from?
From the Open-Meteo weather model for the summit's position at 803 m, refreshed every few hours. Wind is worked out at summit height from the model's upper-air winds, because the standard 10 m wind is roughly half what a summit gets.