Blackheath to Canary Wharf walk

Met Office Forecast

South East England

Cold with showers on Saturday, with snow possible in places.

This Evening and Tonight:

Largely clear with frosts inland, but some isolated showers and a risk of ice patches along coastal areas. However, these will be more frequent and heavy at times across East Sussex and Kent, with snow possible over the North Downs. Minimum Temperature -1C.

Saturday:

Any early showers will ease and die away, followed by developing sunny spells. Dry but cold overnight, with frosts and a risk of freezing fog in places. Maximum Temperature 6C.

Outlook for Sunday to Tuesday:

Dull and cold on Sunday and Monday, any fog slowly lifting into low cloud. Coastal showers likely. Dry, brightening up on Tuesday though staying rather cold.

Day 6-7 and Week 2:

Initially settled overall with the greatest chance of rain in the east. However, there will be a steadily increasing chance of more widespread unsettled weather, bringing cloud, rain, and possibly some hill snow at first, arriving from the Atlantic. The rain, accompanied by strong winds and coastal gales at times, will likely be heaviest in the west, whilst areas further east should remain drier longer. Towards the end of the period, it is likely that things will start becoming more settled again, though outbreaks of rain or showers are still expected at times. Showers could become wintry on high ground, and perhaps at lower levels. Temperatures are likely to begin below average, but quickly trending to around average. A chance of turning colder again later in the period.

Week 3 and 4:

Confidence is very low during this period, with forecast signals weak and rather mixed. On balance, most likely to remain changeable with periods of more settled and unsettled weather both likely. Outbreaks of rain and windy conditions are likely at times, particularly in the east and south, with wintry showers possible on high ground and maybe to lower levels at times. The west and northwest is most likely to see drier weather and sunshine, though this may extend to other parts at times. This will bring potential for fog, frost and very cold nights. Temperatures are likely to be at or below average for this time of year, though some milder interludes are possible. There is a possibility that conditions may become wetter and milder at the start of January.

Met Office : South East England : 2020-12-04T12:38:01

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!