Summit today
Is it safe to climb Cnoc Onna today?
Cnoc Onna today (updated 03:04, 18 Oct): up to 8°C at the summit, feeling as cold as 1°C, summit wind 14 mph gusting 18 mph, 0% chance of rain. A good day for the hills.
Cnoc Onna weather today
Overcast, up to 8°C at the summit, feeling as cold as 1°C, summit wind 14 mph gusting 18 mph, 0% chance of rain. Rated Good.
Cnoc Onna weather tomorrow
Monday 19 October: partly cloudy, up to 9°C at the summit, feeling as cold as 1°C, summit wind 19 mph gusting 24 mph, 0% chance of rain. Rated Good.
Cnoc Onna weather this weekend
Sunday 18 October: overcast, up to 8°C at the summit, feeling as cold as 1°C, summit wind 14 mph gusting 18 mph, 0% chance of rain. Rated Good.
Cnoc Onna summit forecast, next 7 days
| Day | Verdict | High/low | Feels like | Wind/gust mph | Rain or snow |
|---|
| TodayOvercast | Good | 8°/4° | 1° | 14/18 | 0% |
|---|
| TomorrowPartly cloudy | Good | 9°/5° | 1° | 19/24 | 0% |
|---|
| Tue 20Slight rain | Marginal | 8°/6° | 0° | 39/49 | 57% |
|---|
| Wed 21Light drizzle | Marginal | 8°/6° | 1° | 23/29 | 65% |
|---|
| Thu 22Moderate drizzle | Marginal | 8°/5° | 2° | 18/23 | 83% |
|---|
| Fri 23Moderate drizzle | Marginal | 8°/5° | 0° | 25/32 | 93% |
|---|
| Sat 24Slight rain | Poor | 8°/5° | -2° | 60/75 | 82% |
|---|
Cnoc Onna 14-day weather forecast: days 8 to 14, less certain
| Day | Verdict | High/low | Feels like | Wind/gust mph | Rain or snow |
|---|
| Sun 25Moderate drizzle | Marginal | 13°/4° | 0° | 36/45 | 93% |
|---|
| Mon 26Moderate drizzle | Marginal | 12°/6° | 3° | 29/36 | 93% |
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| Tue 27Slight rain showers | Marginal | 8°/4° | 0° | 35/53 | 76% |
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| Wed 28Light drizzle | Marginal | 9°/6° | 2° | 25/31 | 75% |
|---|
| Thu 29Moderate drizzle | Marginal | 10°/7° | 2° | 34/42 | 73% |
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| Fri 30Moderate drizzle | Marginal | 10°/4° | 2° | 14/32 | 63% |
|---|
| Sat 31Moderate drizzle | Marginal | 11°/3° | -1° | 38/48 | 54% |
|---|
Routes up
Routes coming soon
Cloud inversion · 7 days
The chance of standing above a sea of cloud on Cnoc Onna each morning this week, from overnight temperature, humidity and low cloud below the 400m summit.
Dark sky · 7 days
How dark the sky gets over Cnoc Onna each night this week, from cloud cover, moonlight and local light pollution.
Snow · 7 days
No snow is forecast at the summit in the next 7 days.
Sun today
Sunrise 08:09, sunset 18:29
10h 20m of daylight. Golden hour ends 09:00 and starts 17:38. From the summit you see the sun 08:04 to 18:33.
Nearby summits
Close to Cnoc Onna
About Cnoc Onna
Cnoc Onna is 400 m (1,312 ft) high with 114 m of prominence. It is in Blue Stack Mountains, Ireland. OS grid reference G628880. It is the 28th highest of the 45 summits Peakify lists in Blue Stack Mountains. The nearest summits are Sliabh Tuaidh (1.9 km), Sliabh Tuaidh West Top (2.8 km) and An Mam (2.7 km).
How high is Cnoc Onna?
Cnoc Onna is 400 metres high with 114 metres of prominence.
Where is Cnoc Onna?
Cnoc Onna is listed in Blue Stack Mountains, Ireland.
Are there routes for Cnoc Onna?
Route data is not available for this mountain yet, but the page still shows summit, weather, and location context.
Is it safe to climb Cnoc Onna today?
Peakify rates each day on the summit 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. Today's and tomorrow's ratings are at the top of this page. The rating covers the weather only: also check your route, daylight, kit and experience, and in winter whether you need an ice axe and crampons.
What is the weather on Cnoc Onna tomorrow?
Monday 19 October: partly cloudy, up to 9°C at the summit, feeling as cold as 1°C, summit wind 19 mph gusting 24 mph, 0% chance of rain. Rated Good.
What is the weather on Cnoc Onna this weekend?
Sunday 18 October: overcast, up to 8°C at the summit, feeling as cold as 1°C, summit wind 14 mph gusting 18 mph, 0% chance of rain. Rated Good.
What weather information is shown for Cnoc Onna?
The page includes cached mountain forecast context, snow outlook, dark-sky signals, cloud-inversion information, sunrise, sunset, and summit planning details where available.
Written and kept up to date by the Peakify team. The forecast refreshes every hour; how our forecast works.
