Normal people are grilling out today, finding a cool pool or shaded hammock. Gardeners, alas, are not normal people.
Were likely to be mowing, grubbing in the dirt or hauling plants over the three-day weekend, no matter how hot it gets. With a forecast that makes late May feel like late July, dont overdo it.
What to do
Keep up with the deadheading. As soon as flowers are past their peak, snip them off. This keeps the plant from thinking its time to start making seeds.
This is prime weeding time. The bad boys will be so traumatized, they might stay down. I carry black (not striped) sunflower seeds and drop them in the holes when I pull out a weed in a garden bed. Sunflowers are strong competitors in the survival game.
Pack up the pruner. Normally, it is perfectly find to prune shrubs right after they bloom. Late May should be prime time, but not when its 90 degrees.
Plants in pots might need to be watered every day. You can reduce the need by putting mulch or rocks on top of the soil. If it is hot and dry for a long time, move all of the pots to a shaded area near a water source.
What not to do
This sounds counterintuitive, but dont water too much. There is a temptation to turn on the sprinkler and let it run and run. In weather like this, consider one good drink once a week for the lawn and garden beds. If you have any new trees or shrubs, dont let them get so dry they fade away.
Hold off on planting shrubs and trees. You can do it when its this darned hot, but theyll be stressed and will take extra care for a lot longer than if you wait until we have a cooler spell.
Gardening experts say to stop fertilizing your lawn if we have extended periods of dry, hot weather. Fertilizer can burn the grass or encourage it to grow when it should go dormant for its own good.
Dont mow so much. When its hot and not so wet, move the mower setting to the highest level and mow only when the grass is looking ragged. Grass that is a little bit longer shades the ground and retains whatever moisture there is.
Dont beat yourself up if things arent perfect. This is an unusual year.
Do what you can, and then consider looking for a hammock.