ASTRONOMY WEATHER FORECAST
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London

This forecast is updated at 7am, 1pm and 7pm

Issued by Weather Consultancy Services on:
Saturday 12 September 2026 22:30 hrs
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UK & Ireland Weather Summary for Saturday
On Sunday, a frontal wave lingers across southern parts of England and Wales. North of this front, a high pressure ridge extends across the British Isles, with pressure beginning to lower from the northwest late in the day.

Forecast for astronomy in London for the next 5-days
Data based on GFS model updated: Sat 12 September 2026 22:30

Time	SFC Wind	Rain *	Total cloud	Low cloud	Med cloud	High cloud	Temp	Sfc RH	Pressure	Seeing	Clarity
6pm Saturday	W 8g21mph	0mm	79.8%	68.7%	70.5%	70.5%	21C	66%	1021mb	4	1
9pm Saturday	W 5g24mph	0.8mm	100%	89.6%	0.5%	0.5%	19C	79%	1022mb	1	0
00:01am Sunday	W 4g26mph	0.8mm	100%	80.5%	100%	100%	19C	82%	1022mb	0	0
3am Sunday	W 5g19mph	0mm	100%	100%	84.2%	84.2%	19C	85%	1021mb	2	0
6am Sunday	W 3g19mph	0.8mm	100%	100%	100%	100%	18C	91%	1021mb	0	0
9am Sunday	W 3g12mph	1.1mm	100%	100%	1.5%	1.5%	20C	80%	1022mb	2	0
Midday Sunday	W 5g14mph	1.5mm	91.1%	84.2%	0%	0%	20C	84%	1022mb	4	1
6pm Sunday	W 3g11mph	0.4mm	72.7%	7.1%	5%	5%	20C	81%	1022mb	4	2
00:01am Monday	SW 3g11mph	0.2mm	100%	0%	5%	5%	18C	93%	1023mb	4	0
6am Monday	SW 3g10mph	0mm	100%	10.7%	0%	0%	16C	95%	1023mb	1	0
Midday Monday	W 9g11mph	0.1mm	18.7%	18.7%	0%	0%	24C	64%	1022mb	N/A	5
00:01am Tuesday	SW 4g13mph	0mm	0%	0%	0%	0%	19C	84%	1020mb	3	5
Midday Tuesday	W 10g18mph	0.1mm	43.5%	43.5%	5%	5%	24C	51%	1014mb	4	3
00:01am Wednesday	W 6g17mph	0.1mm	1%	0%	0%	0%	15C	75%	1016mb	4	5
Midday Wednesday	NW 8g14mph	0mm	97.2%	97.2%	0%	0%	17C	48%	1017mb	4	0
00:01am Thursday	SW 4g15mph	0.2mm	100%	1.7%	100%	100%	14C	66%	1015mb	2	0
Midday Thursday	NW 7g20mph	0.3mm	100%	100%	100%	100%	16C	76%	1010mb	3	0
00:01am Friday	W 4g20mph	0mm	5%	5%	5%	5%	12C	66%	1012mb	2	5

[* rainfall is previous 6-hours. Gusts are over open ground.]

Planning outlook:
Tuesday low pressure and a cold front will move south across England and Wales with high pressure north west of Scotland. A colder day as rain and snow spreads south. Mainly dry in the channel with sunny spells. Visibilities will be good in the channel but moderate to poor elsewhere in rain and snow.
Wednesday a cell of high pressure is centered west of Ireland and will be ridging east. A cold, windy day with sunny spells and scattered showers of rain and snow. Visibilities will be good but moderate in rain showers, poor in snow showers.
Thursday sees high pressure centred south of Ireland and this will give much of the country a dry, settled, day with sunny spells. Visibilities will be good.
Friday a cold front spreads rain down across Scotland, the Irish Sea and northern England. Fair and dry in the south and in the channel with varying cloud and sunny spells. Visibilities will be good in the south and in the channel, but falling to moderate or locally poor as the rain sets in across the north.
Saturday high pressure to the west of Britain is ridging into Scotland with a front into the far north west. Most areas will be fair and dry with sunny spells today after some patchy mist clears. Visibilities will be good but moderate at first.
Sunday a front moves south east across Britain. Outbreaks of rain will clear western areas in the afternoon. Visibilities will be moderate improving to good as the front clears.

Synoptic charts based on data from 0001 GMT, Saturday 12 September 2026 (Updated daily by 9am)

Tomorrow (Day 2)

Day after tomorrow (Day 3)

This forecast is for planning purposes only.
Forecast is copyright Weather Consultancy Services.