For some reason my grass has decidide to lose it's nice dark green colour lately and show more yellowish.

Always well watered, sprinkler for an hour every evening and trimmed to the same height regularly

Any ideas out there?

Could just be the heat and sun exposure even though you water every evening ? Possibly try watering longer each night.

Alternatively, too much nitrogen in the soil ? Maybe if you can do a Ph check !!

Throw some urea granules over it and give it a good watering in or wait for the rain and do it then

31 minutes ago, petermik said:

Throw some urea granules over it and give it a good watering in or wait for the rain and do it then

Was contemplating a good cut back and dethaching or is this the wrong time of year?

As well as your advice above.

Big difference in a week.