Eight games: Five in Division One, three in Division Two
Division One leaders Surrey at home to Essex
Second-placed Hampshire facing Gloucestershire at Cheltenham
Division Two leaders Notts at Derbyshire
Leicestershire start game against Glamorgan on Wednesday
Somerset 267-5 v Yorkshire
A key morning awaits at Taunton as captain Tom Abell resumes on 114.
Early wickets for Yorkshire could swing the balance in their favour, but any sort of partnership for Somerset would set them on course for a big first-innings total.
All to play for.
Derbyshire v Notts 443-1
Haseeb Hameed and Ben Duckett have resumed batting for Nottinghamshire and a four to Ben Duckett has taken their second-wicket partnership to 397.
They need just one more run to set the highest-ever second-wicket stand for the county and another 10 runs to break the highest partnership for any wicket.
Gloucestershire v Hampshire 213-2
Boom! What a start to the day from James Vince!
The Hampshire skipper rewinds the clock to their T20 Blast triumph last weekend.
He takes a step forward and wallops Zafar Gohar out of the ground.
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Surrey 27-1 v Essex 271
They're under way at The Oval where the sun is still beating down, but nowhere near as hot as yesterday.
Hashim Amla is the new batter in the middle for Surrey after Ryan Patel was dismissed in the final over last night.
#bbccricket
Duncan Cobbett: I really hope Notts let Ben Duckett have a good crack at beating Lara's 501* today! Please encourage Duckett and Haseeb Hameed to try and push on Notts to an all-time world record score over 1000 - once in a generation opportunity! Our place in the top two of the table is very secure so let's break some records!
Some lofty aims there, Duncan!
BBC local radio
Our BBC radio commentators will be among those grateful for the drop in the mercury on the thermometers today.
We have local radio comms from all eight games at the top of the page - while BBC 5 Live Sports Extra are covering the big tussle at the top of Division one between Surrey and Essex.
Choose the game you wish to listen to from the options at the top of the page - and we'll keep you abreast of events elsewhere with our rolling live text commentary too.
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After Tuesday's record temperatures around the country, we are back to something approaching normal on Wednesday, thank goodness.
It's still going to be very warm but there is the possibility of rain, with a risk of thundery showers, particularly across the Midlands.
We cricket fans usually despise downpours but after the last couple of days, is it fair to say even we wouldn't mind the odd shower today?
Hit the thumbs up for yes, a bit of rain, please - thumbs down for no, keep it dry.
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Division One:
Cheltenham: Gloucestershire v Hampshire 203-2
Northampton: Northants 218-7 v Lancashire
Taunton: Somerset 262-5 v Yorkshire
The Oval: Surrey 24-1 v Essex 271
Edgbaston: Warwickshire 155-6 v Kent 165
Division Two:
Derby: Derbyshire v Nottinghamshire 439-1
Lord's: Middlesex v Sussex 328-4
Leicester: Leicestershire v Glamorgan - match begins at 11:00 BST
Morning!
And welcome to a thankfully cooler day two of the County Championship.
We've got eight games coming up, including Leicestershire against Glamorgan which starts today, so let's get straight to it...
Image source, Rex Features