Hampstead Heath walk

Met Office Forecast

South East England

Chilly overnight, cloudier and cooler on Wednesday.

This Evening and Tonight:

Any isolated showers will fade away during the evening, to leave a dry and locally chilly night with clear spells. Some frost is possible in prone rural spots. Low cloud may develop in eastern areas, mainly near the coast. Minimum Temperature 0C.

Wednesday:

Cloudier and cooler in northern and eastern areas. Fine to the southwest, but cloud moving over all areas, perhaps giving patchy rain. Gradually becoming drier and brighter later, with sunshine. Maximum Temperature 16C.

Outlook for Thursday to Saturday:

Dry with variable cloud cover and light winds throughout. Cold overnight with frosts, although it willl feel warm in sunny spells by day. Some brief early fog patches are possible.

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 during this time. However, there is the threat of some rain and a few showers in the North and East. There's a small chance more unsettled conditions with heavier showers could move up from the south to impact southern areas. There are the continued threats of rural frost and patchy fog where winds fall light. Temperatures become quite uncertain depending on where the high 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 : 2021-04-20T14:08:06

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!