Riddlesdown to Coulsdon South Walk

Surrey hourly weather (Open Meteo)

Sunset: 16:10. Dusk: 16:47. Dark: 17:28. Moon 94% (dusk to dawn)

Updated: Sun, 17-Nov at 23:36

	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21
Mon, 18 Nov	20%	8%	3%	3%	0%	0%	0%	8%	13%	25%	40%	73%	83%	93%	93%	90%
Tue, 19 Nov	25%	28%	38%	25%	25%	18%	13%	15%	10%	0%	0%	0%	3%	2%	1%	0%
Wed, 20 Nov	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	1%	1%
Thu, 21 Nov	5%	5%	6%	7%	7%	8%	8%	8%	9%	10%	10%	10%	10%	9%	8%	7%
Fri, 22 Nov	3%	3%	3%	3%	3%	3%	3%	3%	4%	4%	4%	5%	5%	9%	10%	12%
Sat, 23 Nov	41%	46%	50%	54%	58%	61%	63%	65%	66%	67%	67%	67%	67%	67%	67%	66%
Sun, 24 Nov	60%	59%	59%	58%	57%	56%	56%	56%	56%	56%	56%	57%	57%	57%	58%	58%
Mon, 25 Nov	39%	35%	31%	29%	28%	29%	29%	28%	27%	26%	26%	27%	26%	23%	18%	16%
Tue, 26 Nov	23%	25%	29%	32%	35%	38%	39%	35%	28%	23%	20%	19%	19%	21%	24%	26%
Wed, 27 Nov	35%	38%	41%	42%	40%	37%	35%	34%	35%	39%	40%	41%	42%	42%	42%	42%
Thu, 28 Nov	26%	25%	25%	25%	25%	26%	26%	26%	25%	24%	23%	23%	23%	25%	28%	30%
Fri, 29 Nov	13%	12%	13%	14%	15%	17%	19%	20%	21%	22%	23%	23%	23%	22%	20%	18%
Sat, 30 Nov	23%	23%	23%	23%	23%	23%	23%	24%	25%	26%	27%	28%	29%	29%	28%	27%
Sun, 01 Dec	16%	17%	19%	21%	23%	25%	26%	26%	24%	23%	22%	20%	19%	19%	20%	21%
Mon, 02 Dec	16%	15%	13%	12%	11%	10%	10%	10%	10%	11%	12%	12%	13%	14%	16%	17%

Percentages are the chance of rain.

Weather data by Open-Meteo

Surrey hourly weather (Met Office)

Sunset: 16:10. Dusk: 16:47. Dark: 17:28. Moon 94% (dusk to dawn)

Updated: Sun, 17-Nov at 20:00

	06	09	12	15	18	21
Today						89%
Mon, 18 Nov	54%	47%	13%	52%	83%	63%
Tue, 19 Nov	74%	42%	12%	10%	9%	3%
Wed, 20 Nov	1%	2%	1%	1%	1%	1%
Thu, 21 Nov	11%	13%	11%	14%	8%	8%
Fri, 22 Nov	1%	1%	0%	1%	2%	8%
Sat, 23 Nov	21%	74%	79%	79%	76%	72%
Sun, 24 Nov	22%	14%	16%	16%	13%

Percentages are the chance of rain.

Weather data by Met Office

Regional weather (Met Office)

Sunset: 16:10. Dusk: 16:47. Dark: 17:28. Moon 94% (dusk to dawn)

Updated: Sun, 17-Nov at 23:38

South East England

Mostly cloudy, some rain tonight. Similar on Monday.

• Cloudy this evening with outbreaks of rain overnight, mainly becoming confined to southernmost counties by the morning
• Chance of some clearer spells developing in the north
• Moderate coastal breezes gradually easing overnight
• Rather chilly
• Minimum Temperature 4C

Monday:

• Cloudy in the south with rain easing
• Drier and brighter further north for a time, but clouding over during the afternoon and turning wet into the evening with strengthening winds
• Maximum Temperature 9C

Outlook for Tuesday to Thursday:

• Rain at first Tuesday with strong winds, perhaps gales on coasts
• This clearing during Tuesday to leave a cold and windy period with sunny spells, perhaps coastal rain on Thursday

UK Day 6-7 and week 2

• Cold or very cold conditions are expected across most if not all parts of the UK early in this period, with wintry showers affecting in particular northern parts and exposed coastal districts, although it may well be largely sunny
• Into the weekend likely turning to more wet and windy conditions with some snowfall on the leading edge of this
• Into the following week possibly cooler again though wintry conditions mostly limited to northern hills with a potential for more organised areas of rain, snow and strong winds at times, this probably also associated with milder temperatures, at least in the south
• Later in the period, conditions remain uncertain, but some indications for a further more settled spell around the turn of the month

UK Week 3 and 4

• Signals vary in prevailing weather patterns through early December
• In general, there looks like a trend towards drier and more settled conditions, with high pressure potentially being the more dominant influence over the UK
• However
• there is also a chance of more changeable weather patterns, which would see Atlantic weather systems periodically move across the country
• These will bring some wetter and windier interludes with a risk of some snow, especially for hills in the north
• Temperatures generally close to average, perhaps a little above at times, especially in the south

Weather data by Met Office

Surrey Air Quality (Pollen and UV)

Updated: Sun, 17-Nov at 23:36

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

Surrey Visibility

Updated: Sun, 17-Nov at 23:36

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

Surrey 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.

Surrey 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!

Surrey weather (Accuweather)