Heddon's Mouth Circular Walk

Exmoor hourly weather (Open Meteo)

Sunset: 16:46. Dusk: 17:23. Dark: 18:04. Moon 49% (01:35 to dawn)

Updated: Mon, 20-Jan at 08:37

	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21
Today			0%	3%	0%	0%	0%	0%	0%	3%	0%	0%	0%	0%	0%	0%
Tue, 21 Jan	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	5%	8%
Wed, 22 Jan	13%	12%	11%	10%	11%	14%	15%	14%	12%	10%	8%	6%	5%	5%	5%	5%
Thu, 23 Jan	0%	1%	3%	5%	8%	10%	13%	16%	20%	23%	27%	29%	30%	29%	25%	21%
Fri, 24 Jan	53%	58%	63%	68%	72%	74%	75%	74%	71%	66%	61%	57%	53%	50%	48%	45%
Sat, 25 Jan	39%	41%	42%	44%	46%	47%	48%	49%	49%	50%	50%	50%	51%	51%	51%	50%
Sun, 26 Jan	31%	28%	25%	23%	21%	20%	20%	21%	23%	27%	30%	35%	39%	44%	49%	53%
Mon, 27 Jan	68%	68%	68%	68%	68%	68%	68%	47%	44%	42%	40%	37%	35%	33%	32%	32%
Tue, 28 Jan	45%	44%	43%	42%	43%	46%	48%	51%	53%	52%	43%	29%	19%	16%	17%	19%
Wed, 29 Jan	35%	33%	30%	29%	30%	32%	35%	38%	41%	42%	38%	32%	26%	23%	21%	19%
Thu, 30 Jan	32%	33%	33%	32%	31%	30%	29%	29%	29%	29%	29%	29%	29%	29%	28%	28%
Fri, 31 Jan	39%	38%	36%	34%	31%	28%	26%	24%	23%	22%	21%	20%	19%	18%	16%	15%
Sat, 01 Feb	19%	20%	20%	20%	20%	19%	19%	19%	18%	18%	18%	17%	🌫 16%	🌫 15%	🌫 13%	🌫 11%
Sun, 02 Feb	10%	11%	12%	13%	14%	15%	16%	16%	16%	16%	16%	16%	16%	17%	19%	20%
Mon, 03 Feb	16%	18%	20%	23%	26%	28%	29%	28%	26%	23%	20%	18%	16%	16%	18%	19%
Tue, 04 Feb	13%	14%	17%	19%	21%	24%	26%	27%	27%	27%	27%	27%	26%	25%	23%	21%

Percentages are the chance of rain.

Weather data by Open-Meteo

Exmoor hourly weather (Met Office)

Sunset: 16:46. Dusk: 17:23. Dark: 18:04. Moon 49% (01:35 to dawn)

Updated: Tue, 21-Jan at 20:00

	06	09	12	15	18	21
Today						20%
Wed, 22 Jan	🌫 25%	13%	6%	1%	2%	3%
Thu, 23 Jan	12%	67%	94%	39%	6%	8%
Fri, 24 Jan	98%	92%	18%	5%	5%	5%
Sat, 25 Jan	7%	9%	9%	17%	17%	12%
Sun, 26 Jan	6%	9%	57%	89%	90%	80%
Mon, 27 Jan	12%	10%	14%	17%	13%	12%
Tue, 28 Jan	16%	14%	15%	14%	12%

Percentages are the chance of rain.

Weather data by Met Office

Regional weather (Met Office)

Sunset: 16:46. Dusk: 17:23. Dark: 18:04. Moon 49% (01:35 to dawn)

Updated: Tue, 21-Jan at 23:38

South West England

Cloudy with mist and hill fog returning widely tonight.

• An increasingly cloudy evening with scattered showers spreading slowly northwards from the southwest
• Light winds, leading to widely misty conditions elsewhere with hill fog returning across the higher ground
• Feeling chilly beneath grey skies, but most places remaining frost free
• Minimum Temperature 3C

Wednesday:

• Scattered showers clear eastwards leaving a settled but rather cloudy day, with the best of any brightness remaining in the west
• Feeling cool beneath grey skies
• Maximum Temperature 9C

Outlook for Thursday to Saturday:

• A band of persistent and occasionally heavy rain spreads eastwards through Thursday before Storm Éowyn brings very windy conditions on Friday
• Brighter with scattered showers to follow on Saturday

UK Day 6-7 and week 2

• This looks like being and unsettled period across much of the country, but especially for northern and western parts
• During Sunday and into Monday, another deep area of low pressure looks likely to move across the UK from the Atlantic, bringing wet and windy conditions to most if not all parts
• Further spells of wet and windy weather look like moving east from the Atlantic to affect the UK during the rest of the period too, with drier, brighter spells in between
• There is the potential for further weather warnings or even a named storm at some point
• Temperatures overall are likely to end up being around or slightly above average, though wind and rain will make it feel chilly, and brief cool spells are likely between weather systems

UK Week 3 and 4

• Generally mild at first, with periods of rain, showers and strong winds alternating with short-lived brighter and cooler interludes
• With time, these may become increasingly confined to northern parts, with pressure possibly building across southern areas
• This would result in longer drier and more-settled spells here, albeit with an increased chance of overnight fog and frost with temperatures falling correspondingly

Weather data by Met Office

Exmoor Air Quality (Pollen and UV)

Updated: Tue, 21-Jan 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: Mon, 20-Jan at 08:37

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

Notes

• Max Height (solar noon) is when the sun is highest in the sky.
• Day length is dawn to dusk as there is enough light for walking for at least 30 minutes before sunrise and after sunset, even on an overcast day.
• At 'Light' (nautical dawn) the horizon becomes visible. At 'Dawn' (civil dawn) there is enough light to read, and drivers can switch their lights off. Finally the sun rises.
• After sunset, there is still enough light to read until 'Dusk' (civil dusk) or lighting up time for drivers. The horizon is still visible until 'Dark' (nautical dusk).
• Times will vary if there is a hill on the horizon.

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
• Sunlight is ~ 1,000,000 times brighter than moonlight.
• Of course, you need a cloudless night as well!

Exmoor weather (Accuweather)