Looks very low compared with official figures, with the lowest (lowland) readings being around 30%.

http://www.weatheronline.co.uk/weather/maps/current?LANG=en&DATE=1373205600&CONT=euro&LAND=UK&KEY=UK&SORT=3&UD=1&INT=06&TYP=feuchte&ART=tabelle&RUBRIK=akt&R=310&CEL=C&SI=mph

As for record values - see the discussion here: http://www.ukweatherworld.co.uk/forum/index.php?/topic/97854-lowest-relative-humidity-recorded-in-the-uk/

I think the 10% figure mentioned is likely the lowest reliable-ish value away from the Highlands, with perhaps the 8% at Altnaharra (revised from 1.6%) the overall winner.

Rob many thanks for your comprehensive answer-looks like my freinds reading was well and truly false.

25.4'C but cloud is arriving

I see that NI has now the claim to the hottest day of the year so far:

"It has recently been confirmed that the new highest temperature of the year so far has been recorded at Edenfel, County Tyrone in Northern Ireland on Monday 8 July, reaching 29.9C. "

http://www.metoffice.gov.uk/weather/uk/uk_forecast_weather.html

(I grew up in Tyrone and still have no idea where Edenfel is! I believe it may be a street or an area of Omagh rather than an actual separate population centre?)

New UK Maximum confirmed for 2013

It has recently been confirmed that the new highest temperature of the year so far has been recorded at Edenfel, County Tyrone in Northern Ireland on Monday 8 July, reaching 29.9C. Before this, 29.7 C at Bournemouth Hurn on Sunday 7 July was the previous UK maximum. Meanwhile, Scotland saw its highest temperature of the year so far during the afternoon of Tuesday 9 July, reaching 28.7 C at Strathallan Airfield. Edinburgh Gogerbank was nearly as hot with the temperature peaking at 28.5 C.

Edit - beaten to it!

Bet that record won't hold for long though.. Friday and Saturday look to threaten it.

There's an Edenfel Park in Omagh on Google Maps, but it appears to be a suburban street. At a guess I would say the weather station is likely to be at the Dept of Agriculture & Rural Development building nearby: http://goo.gl/z8C0g

Edenfel is also credited with the NI record low maximum on this page, in Dec 2010: http://www.metoffice.gov.uk/climate/uk/extremes/

Edit - just noticed the record was set on Monday, not today! Annoying that we still didn't quite break 30C for the prediction game!

Max today, 18.8C. By 10.30am, cloud cover, and by 12:30PM, %%£$%ing drizzle!! #anyonegotahousetoswap

We may not be having a full-blown heatwave, but the plentiful sunshine and reasonably high temperatures are having a notable impact on the SSTs around the UK:

http://ghrsst-pp.metoffice.com/pages/latest_analysis/sst_monitor/ostia/test_0_600.png

Now largely 14-15°C across open water and 16-17°C for near-shore waters in the south and west.

There has also been substantial warming around NW Europe with SST anomalies rising from 1-2°C below average to about as far above average in many areas:

http://ghrsst-pp.metoffice.com/pages/latest_analysis/sst_monitor/ostia/sst_anom_0_600.png

...but the most impressive anomalies are near to the coasts of Wales and N. England. Over 3°C above the LTA in places still working on the Channel and far-southern reaches of the North Sea though. In theory those should warm to above average any day now...

Only 17.6 C here but the sun is back out again and the 71% humidity and the lighter wind are making it feel quite muggy anyway.

How could I be the most nearest to the continent and yet still hold onto temperatures that are more suited for April? Still, I'm not a heat lover so this suits me fine anyway.

Because the highest temperatures are on west-facing coasts, e.g. Bude and Chivenor.

Is it unusual for the hottest temperture of the year to be recorded in Ireland? 

It is unusual yes, you would expect somewhere in London or just to the west of London around Heathrow to reach the highest max's during any given Summer.

And once again the Republic has soundly beaten the UK: Shannon Airport (Clare) 29.5C, Finner (Donegal) and Claremorris (Mayo) both 28.5C.

You can see how much less cloud there is over Ireland than the UK: http://www.met.ie/sat/iuk-ir.asp

Mine:

Sun - 25.9

Mon - 28.8

Tue - 26.9

Wed - 25.1

An absolutely brilliant spell of summer weather, which looks set to carry on. Going to get the big pool out on Saturday

And mine...

Wed 3rd: 20.1°C

Thurs 4th: 22.9°C

Fri 5th: 23.3°C

Sat 6th: 27.1°C

Sun 7th: 25.1°C

Mon 8th: 23.9°C

Tues 9th: 30.2°C

Wed 10th: 17.9°C  - though felt very pleasant even so!

For the coldest (lowland) part of England, this is remarkable weather! WIth glorious sun on most of those days (even today in the afternoon).

Forecast temps are well into the 20s for days to come too. Incredible stuff. LOVING IT!

This NE'ly wind has kept my evenings chilly while the north bakes. Daytime maxes have been OK generally between 22-25c.

9pm temperatures have not been conducive to chilling in the garden.

Fri 16.6c

Sat 18.3c

Sun 17.5c

Mon 15.5c

Tues 14.9c

This evening at 9pm 12.9c 

I was just thinking earlier, that if the wind died down a bit, I might have got a bit of evap cooling and seen the odd snowflake or two...