Waterlink Way : Lower Sydenham, to Greenwich walk

Met Office Forecast

South East England

Clear and frosty tonight. Pleasant sunny spells Thursday.

This Evening and Tonight:

It will be dry this evening and overnight, with long clear spells, and winds mainly light. This will allow temperatures to fall, with a widespread frost developing. Minimum Temperature -1C.

Thursday:

Dry with long sunny spells. After a cold start temperatures will recover to give a pleasant feeling afternoon inland with winds light, but breezier and fresher along some coasts. Maximum Temperature 16C.

Outlook for Friday to Sunday:

Continuing dry with pleasantly warm sunshine and variable cloud cover. Sometimes cooler on coasts with brisk winds. Frosts are still likely during nights, where skies are clear.

Day 6-7 and Week 2:

A settled regime will likely be in place across much of the country at first with high pressure likely to be centred to the west or northwest of the UK. However, there is the threat of some rain and a few showers in the North at first, these perhaps extending by midweek to all but central and southern parts. Throughout this period, there is the continued threat of rural frost and patchy fog where winds fall light. Temperatures are quite uncertain depending on where the area of high pressure resides, particularly in the east where temperatures are likely to struggle above average. Warmer days are most likely to be further inland towards the south and west.

Week 3 and 4:

Confidence is low for this period as is typical of spring. The UK will likely see spells of fine, dry weather at times with fair-weather cloud and plenty of sunny spells, as well as an increased likelihood of more unsettled periods when compared to April. All areas expected to see showers or longer spells of rain at times. Temperatures are likely to be close to the average for the time of year, with the possibility of some warmer spells.

Met Office : South East England : 2021-04-21T13:05:19

Daylight : London

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

It should still be light enough to read at dawn and dusk, so there will be enough light for walking even earlier (later).

Moonlight : London

Notes

• The moon's phase or fracillum (percentage of the moon illuminated) doesn't vary much with location.
• A full moon is not just bigger, its much brighter. A half moon ('50%') give less than 5% of the illumination of a full moon. You can walk with a half 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!