Anybody else seeing temperature rises under clear skies. I posted a few minutes ago on current conditions but it's gone up further since! After a 32.6C day, and 28C at 8.15 when I got home from work, it dropped to just below 25C half an hour ago. It's now heading up, 25.1 at 10.35, 25.3 at 1045. The sky is about 2 oktas and the wind is light, with a few moderate gusts. Is this all to do with rapidly increasing 850s?

Thanks for the reply, but it's not normal here in summer, under clear, calm conditions. I see it frequently with changing air-masses in winter- but I'm now at 25.5 and the wind is really light( there is more cloud now heading in from the WSW, but I understand that the cloud reduces the speed with which temperature falls away, rather than actually warming things in summer, or is that too simplistic?)

Last year on 1st July there were early dips and falls by a few tenths, resulting in a very warm night. Looking at the synoptics I'm wondering if the radiative nature of the near-surface warmth is tempered somewhat by the increase in the uppers- close to 20 tonight.

I think condensation heating will have something to do with it, especially if there are clouds starting to form. Stable temperatures + rising humidity = condensation which means warming. Any dampness on the grass?

Cheers Tim; your answer made sense to me, but the grass is actually surprisingly dry. The temperature is now down to 25.4 and it feels weird stepping out- I truly expected dew but there is none (that I can feel). Yesterday morning the grass was wet until nearly midday (in full sun). I suppose this unusual evening doesn't fit the frequent patterns and I have just been derailed by it!

I'm going to have to go with your thoughts on this Pics, a kind of natural variability on the short time scale; let you know if anything freaky happens tomorrow!

Here it started to fall as wind dropped out, then rose markedy as it picked up - both in the late evening and this morning.