Greensand Way 1 : Witley to Haslemere via Thursley, Surrey Hills Walk

Surrey hourly weather (Open Meteo)

Sunset: 17:58. Dusk: 18:31. Dark: 19:10. Moon 90% (dusk to 05:47)

Updated: Mon, 10-Mar at 14:36

Percentages are the chance of rain.

Weather data by Open-Meteo

Surrey hourly weather (Met Office)

Sunset: 17:58. Dusk: 18:31. Dark: 19:10. Moon 90% (dusk to 05:47)

Updated: Mon, 10-Mar at 14:00

Percentages are the chance of rain.

Weather data by Met Office

Regional weather (Met Office)

Sunset: 17:58. Dusk: 18:31. Dark: 19:10. Moon 90% (dusk to 05:47)

Updated: Mon, 10-Mar at 14:38

South East England

Mainly fine but on the cloudy side. Markedly colder Tuesday.

• Relatively warm but on the cloudy side, with the odd spot of rain possible at times, mainly in the south
• Probaby driest and brightest with some hazy sunny spells in the east
• Temperatures above average, but cooler than on Sunday
• Maximum Temperature 15C

Tonight:

• Starting mainly dry but rather cloudy, with limited clearer spells allowing a slight grass frost in prone spots
• Becoming cloudier generally from the north later, with a little rain possible
• Minimum Temperature 2C

Tuesday:

• Early cloud and outbreaks of rain soon clearing southwards
• Bright and breezy, with isolated showers, these mainly in the east
• Markedly colder than of late, with temperatures widely below average
• Maximum Temperature 10C

Outlook for Wednesday to Friday:

• Remaining rather cold through this period, accentuated by the wind
• A mixture of sunny spells and showers is expected, the showers most often affecting the east
• Overnight frosts returning

UK Day 6-7 and week 2

• The weekend will continue on a cool theme, but with the high pressure to the north becoming more dominant it should lead to a reduction in shower activity seen on previous days
• So there should be a good deal of dry weather with plenty of sunshine by day, but still some noticeably chilly nights with frost fairly widespread
• The odd fog patch is possible in the north, and a brisk breeze across the south will make it feel notably chilly here on Saturday
• Next week is likely to see a gradual transition to less settled conditions as the high likely withdraws to the east
• So rain or showers at times, mostly focussed across the south, the north perhaps staying largely dry and it is also likely to become much milder

UK Week 3 and 4

• Confidence is low, but through the remainder of March changeable weather patterns are most likely
• This means periods of unsettled, wet and windy weather interspersed with some drier and brighter spells
• Into early April, there may be a transition to more-frequent drier and more settled spells
• Temperatures will probably be above average overall

Weather data by Met Office

Surrey Air Quality (Pollen and UV)

Updated: Mon, 10-Mar at 14:36

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: Mon, 10-Mar at 14:36

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

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.

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

Surrey weather (Accuweather)