Heddon's Mouth Circular Walk

Exmoor hourly weather (Open Meteo)

Sunset: 16:16. Dusk: 16:54. Dark: 17:35. Moon 41% (00:17 to dawn)

Updated: Sat, 23-Nov at 23:37

	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21
Sun, 24 Nov	98%	98%	100%	98%	100%	100%	100%	100%	93%	95%	90%	78%	68%	65%	50%	33%
Mon, 25 Nov	0%	0%	0%	3%	0%	3%	5%	8%	3%	5%	0%	0%	0%	0%	0%	0%
Tue, 26 Nov	18%	16%	11%	8%	7%	8%	10%	16%	23%	30%	32%	38%	43%	46%	49%	51%
Wed, 27 Nov	55%	51%	46%	40%	34%	28%	23%	19%	15%	11%	8%	5%	3%	2%	1%	2%
Thu, 28 Nov	🌫 5%	🌫 6%	🌫 7%	🌫 9%	10%	12%	13%	14%	15%	16%	17%	17%	18%	23%	23%	23%
Fri, 29 Nov	25%	26%	26%	27%	27%	28%	28%	28%	29%	30%	30%	31%	31%	32%	32%	33%
Sat, 30 Nov	28%	27%	26%	25%	24%	23%	23%	23%	23%	23%	23%	23%	23%	24%	24%	24%
Sun, 01 Dec	29%	26%	21%	19%	23%	30%	35%	34%	31%	29%	32%	36%	39%	38%	35%	32%
Mon, 02 Dec	29%	25%	19%	16%	18%	22%	26%	28%	29%	29%	28%	26%	23%	19%	14%	10%
Tue, 03 Dec	23%	25%	26%	26%	25%	24%	23%	23%	23%	26%	27%	28%	29%	29%	28%	27%
Wed, 04 Dec	35%	37%	39%	41%	43%	44%	45%	45%	44%	43%	42%	40%	39%	38%	37%	36%
Thu, 05 Dec	42%	40%	37%	33%	30%	26%	23%	21%	19%	18%	17%	16%	16%	16%	16%	17%
Fri, 06 Dec	26%	26%	26%	26%	26%	26%	26%	26%	27%	27%	27%	27%	26%	24%	22%	20%
Sat, 07 Dec	10%	12%	15%	18%	21%	24%	26%	26%	25%	24%	22%	20%	19%	18%	18%	18%
Sun, 08 Dec	23%	23%	24%	24%	24%	24%	23%	21%	18%	16%	13%	11%	10%	11%	13%	16%

Percentages are the chance of rain.

Weather data by Open-Meteo

Exmoor hourly weather (Met Office)

Sunset: 16:16. Dusk: 16:54. Dark: 17:35. Moon 41% (00:17 to dawn)

Updated: Sat, 23-Nov at 20:00

	06	09	12	15	18	21
Today						94%
Sun, 24 Nov	96%	89%	86%	82%	76%	14%
Mon, 25 Nov	14%	10%	43%	43%	12%	9%
Tue, 26 Nov	4%	6%	8%	13%	10%	17%
Wed, 27 Nov	75%	37%	11%	4%	3%	2%
Thu, 28 Nov	8%	8%	9%	8%	8%	11%
Fri, 29 Nov	16%	15%	13%	14%	11%	16%
Sat, 30 Nov	16%	15%	15%	15%	17%

Percentages are the chance of rain.

Weather data by Met Office

Regional weather (Met Office)

Sunset: 16:16. Dusk: 16:54. Dark: 17:35. Moon 41% (00:17 to dawn)

Updated: Sat, 23-Nov at 23:38

South West England

Unsettled with further spells of heavy rain and strong winds.

• Remaining unsettled this evening and overnight with further spells rain, becoming heavy and persistent again by dawn, especially over the hills
• Staying very windy and mild
• Minimum Temperature 10C

Sunday:

• Another wet day with a band of heavy and persistent rain across the region
• Rain may gradually clear the west later by the evening
• Mild and windy
• Maximum Temperature 15C

Outlook for Monday to Wednesday:

• Sunshine and heavy showers through Monday and Tuesday
• Outbreaks of rain on Wednesday
• Strongest winds easing with temperatures returning closer to the seasonal average

UK Day 6-7 and week 2

• Probably a quieter interlude to start this period for much of the UK as high pressure builds across the north with a return of night frosts
• The high is likely to migrate eastwards during the second half of next week, potentially allowing some outbreaks of rain to move into some some western and northwestern areas along with some stronger winds, these probably edging into other parts of the UK by next weekend, although the east and southeast may hang on to drier conditions throughout
• Into December, and while signals are mixed it looks most likely that high pressure may re-assert itself close to or over the UK, with temperatures generally near average, but some overnight frost is likely, and rather cold by day where any fog persists

UK Week 3 and 4

• The start of this period looks like being largely settled, with high pressure close to if not over the UK
• However as we move further into December there are signs that it will become less settled with west or northwesterly types preferred, These will bring some wetter and windier interludes with a risk of some snow, especially for hills in the north
• These conditions look more likely to dominate towards the middle of December
• Temperatures generally close to average through the period

Weather data by Met Office

Exmoor Air Quality (Pollen and UV)

Updated: Sat, 23-Nov at 23:37

Key : Low Medium High Very High

Pollens

These pollens are shown (in season):

• Grass
• Alder and birch (trees)
• Mugwort and Ragweed (weeds)

When out walking, wraparound glasses, a disposable or washable facemask, and being at the front of the group, all help.

Other forecasts: Met Office, University of Worcester

UV and Air Quality

The UV forecast takes account of cloud cover.

"Air Q", the European Air Quality index, is a mix of dust/particulates, ozone, sulphur and nitrous oxides

Data

Weather data by Open-Meteo and CAMS ENSEMBLE

Exmoor Visibility

Updated: Sat, 23-Nov at 23:37

Visibility in km. Above 50km is 'good'. Humidity and air pollution make it worse. Theoretical maximum is 300km/200 miles in clean dry polar air.

On the South Downs, at ~ 170m/500ft, the horizon is is ~ 45km/30 miles away. On a mountain at 1,000m/3,000ft, it is ~ 160km/100 miles away. Formula: horizon in km = √ (13 x altitude in m)

Weather data by Open-Meteo

Exmoor daylight

Max Height (solar noon) is when the sun is highest in the sky.

Day length is dusk to dawn. Times will vary if there is a hill on the horizon.

After 'Light' (nautical dawn) and before 'Dark' (nautical dusk), the horizon should be visible.

After 'Dawn' (civil dawn) and before 'Dusk' (civil dusk, or lighting up time), there should be enough light to read,

There will be enough light for walking for at least 30 minutes before sunrise and after sunset, even on an overcast day.

Exmoor moonlight

Moonlight chart for walking at night.

Notes

• The percentage of the moon which is illuminated doesn't vary much with location.
• A full moon is not just bigger, it is much brighter. A quarter moon (1/2 disk visible) give less than 5% of the illumination of a full moon. You can walk with a quarter moon if its high in the sky (after dusk for a growing moon, before dawn for a shrinking moon).
• Sky glow (light reflected by air or clouds) from nearby cities, and especially snow on the ground also effect light levels.
• Times will vary a few minutes, as (i) these figures are for the centre of the county the walk is in, (ii) if there are hills on the horizon, and (iii) if you are on a hill
• Of course, you need a cloudless night as well!

Exmoor weather (Accuweather)