Lochnagar - Cac Carn Beag weather tomorrow, this weekend and 14-day summit forecast
1,156 m · Cairngorms
Cac Carn Beag is the 1156m summit of Lochnagar, the granite Munro above Royal Deeside climbed from the Spittal of Glenmuick.
Lochnagar - Cac Carn Beag today (updated 12:16, 28 Oct): up to 4°C at the summit, feeling as cold as -8°C, summit wind 45 mph gusting 56 mph, 100% chance of rain. A poor day for the hills. Best day this week: Tuesday, summit gusts 17 mph.
Lochnagar - Cac Carn Beag weather today, tomorrow and this weekend
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Poor Today Wednesday 28 October
Moderate rain, up to 4°C at the summit, feeling as cold as -8°C, summit wind 45 mph gusting 56 mph, 100% chance of rain. Rated Poor. Sunrise 07:14, sunset 16:38.
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Marginal Tomorrow Thursday 29 October
Mostly dry, up to 5°C at the summit, feeling as cold as -3°C, summit wind 27 mph gusting 42 mph, 0% chance of rain. Rated Marginal. Sunrise 07:16, sunset 16:36.
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Good Saturday 31 October
Moderate drizzle, up to 5°C at the summit, feeling as cold as -5°C, summit wind 22 mph gusting 27 mph, 26% chance of rain. Rated Good. Sunrise 07:21, sunset 16:31.
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Marginal Sunday 1 November
Fog, up to 3°C at the summit, feeling as cold as -8°C, summit wind 21 mph gusting 26 mph, 20% chance of rain. Rated Marginal. Sunrise 07:23, sunset 16:29.
Best day of the next seven: Tuesday 3 November, with summit gusts around 17 mph and a 2% chance of rain. Peakify picks it as the day with the lightest gusts, after a penalty for any chance of rain over 40%.
Lochnagar - Cac Carn Beag 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 | Poor | Moderate rain | 4° / 0° | -8° | 45 / 56 mph | 100% | — |
| Tomorrow | Marginal | Light drizzle | 5° / 3° | -3° | 27 / 42 mph | 0% | — |
| Fri 30 Oct | Poor | Light drizzle | 6° / 3° | -5° | 40 / 52 mph | 8% | — |
| Sat 31 Oct | Good | Moderate drizzle | 5° / -2° | -5° | 22 / 27 mph | 26% | — |
| Sun 1 Nov | Marginal | Fog | 3° / -4° | -8° | 21 / 26 mph | 20% | — |
| Mon 2 Nov | Marginal | Fog | 4° / -4° | -8° | 21 / 27 mph | 0% | — |
| Tue 3 Nov | Marginal | Fog | 5° / -5° | -8° | 14 / 17 mph | 2% | — |
| Days 8 to 14: less certain | |||||||
| Wed 4 Nov | Marginal (less certain) | Fog | 1° / -6° | -9° | 11 / 14 mph | 2% | — |
| Thu 5 Nov | Marginal (less certain) | Fog | 1° / -6° | -10° | 9 / 17 mph | 2% | — |
| Fri 6 Nov | Good (less certain) | Fog | 2° / -3° | -6° | 12 / 15 mph | 3% | — |
| Sat 7 Nov | Good (less certain) | Fog | 2° / -3° | -6° | 13 / 17 mph | 14% | — |
| Sun 8 Nov | Marginal (less certain) | Fog | 3° / -5° | -9° | 23 / 29 mph | 18% | — |
| Mon 9 Nov | Marginal (less certain) | Light drizzle | 5° / 2° | -1° | 34 / 42 mph | 31% | — |
| Tue 10 Nov | Poor (less certain) | Moderate rain | 7° / 1° | -2° | 54 / 68 mph | 25% | — |
The cached forecast has no freezing level; snow is the model's summit snowfall for the day.
How the Lochnagar - Cac Carn Beag summit forecast is made
The numbers come from the Open-Meteo weather model for the summit's position at 1,156 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 Lochnagar - Cac Carn Beag
What is the Lochnagar - Cac Carn Beag weather tomorrow?
Thursday 29 October: mostly dry, up to 5°C at the summit, feeling as cold as -3°C, summit wind 27 mph gusting 42 mph, 0% chance of rain. Rated Marginal.
What is the Lochnagar - Cac Carn Beag weather this weekend?
Saturday 31 October: moderate drizzle, up to 5°C at the summit, feeling as cold as -5°C, summit wind 22 mph gusting 27 mph, 26% chance of rain. Rated Good. Sunday 1 November: fog, up to 3°C at the summit, feeling as cold as -8°C, summit wind 21 mph gusting 26 mph, 20% chance of rain. Rated Marginal.
Is there a 14-day Lochnagar - Cac Carn Beag weather forecast?
Yes. This page lists up to 14 days of summit weather for Lochnagar - Cac Carn Beag, 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 Lochnagar - Cac Carn Beag summit forecast come from?
From the Open-Meteo weather model for the summit's position at 1,156 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.