Guildford Circular via Albury Park Walk

Surrey hourly weather (Open Meteo)

Sunset: 18:07. Dusk: 18:40. Dark: 19:19. Moon 97% (19:42 to dawn)

Updated: Sat, 15-Mar at 08:36

Percentages are the chance of rain.

Weather data by Open-Meteo

Surrey hourly weather (Met Office)

Sunset: 18:07. Dusk: 18:40. Dark: 19:19. Moon 97% (19:42 to dawn)

Updated: Sat, 15-Mar at 07:00

Percentages are the chance of rain.

Weather data by Met Office

Regional weather (Met Office)

Sunset: 18:07. Dusk: 18:40. Dark: 19:19. Moon 97% (19:42 to dawn)

Updated: Sat, 15-Mar at 08:38

South East England

Mainly dry, some sunny spells and feeling rather cool.

• Mainly dry with sunny spells, although cloudier periods may develop for many areas around the middle of the day
• The cloud may be thick enough to produce an odd shower, mainly across Kent
• Feeling rather cold in the breeze
• Maximum Temperature 10C

Tonight:

• Most of the cloud will disperse leaving largely clear skies, allowing a widespread frost to develop, along with perhaps some patchy freezing fog
• Minimum Temperature -3C

Sunday:

• Frosty and mainly sunny start, with any fog clearing
• Then cloudy conditions develop for many areas, along with perhaps isolated showers, although some sunny spells are likely to still occur
• Maximum Temperature 10C

Outlook for Monday to Wednesday:

• Monday cloudy start but then becoming brighter, with temperatures near normal
• Tuesday and Wednesday sunny, breezy and with temperatures rising a little by day
• Each night a widespread frost develops

UK Day 6-7 and week 2

• High pressure is expected to be centred to the east of the UK initially, with a good deal of fine, dry and reasonably sunny weather in a south to southeasterly flow
• Temperatures are expected to rise, to well above average in some areas
• Later in the week there will likely be a gradual transition to less settled conditions from west to east, as low pressure becomes more dominant with an increasing chance of rain or showers by the weekend and into the final week of March, perhaps heavy in places
• Temperatures, initially above average, will likely trend back closer to normal, although with more cloud this will tend to reduce the risk of frost to an extent

UK Week 3 and 4

• Confidence is naturally rather low, but blocked patterns are generally more favoured for the end of March and first part of April
• This can lead to slow-moving areas of low and high pressure, and depending on their location can result in extended periods of either dry conditions or, perhaps more likely, wetter episodes in the form of rain or showers
• Either way, whilst temperatures overall may be near average, given the time of year this type of regime tends to increase the chance of periods of below average temperatures at times

Weather data by Met Office

Surrey Air Quality (Pollen and UV)

Updated: Sat, 15-Mar at 08:36

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: Sat, 15-Mar at 08:36

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)