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How Often To Water Tomatoes In Hot Weather?
In hot weather, water tomatoes deeply every 1 to 2 days, and daily in pots. Learn how to keep fruit from cracking and flowers from dropping in the heat.
In hot weather above 90°F, water tomatoes deeply every 1 to 2 days, and potted tomatoes every day. Give about 1 to 2 inches of water a week in the ground, split into deep soaks. Steady moisture matters more than the amount, because swings cause cracked fruit and blossom end rot.
A starting point, not a rule. Check the soil before each watering and stretch the gap in cool, cloudy weather.
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Tomatoes love heat, but only up to a point. Once the days climb past 90°F, plants lose water faster than the roots can supply it, and the fruit starts to pay for it.
Hot weather also changes how the plant behaves. Above about 90°F by day, or 75°F at night, many tomato flowers drop without setting fruit. Your job is to keep the soil steadily moist, so the plant stays as calm as possible while the heat lasts.
Tomato watering schedule in hot weather
| Where they grow | How often |
|---|---|
| In the ground, 80 to 90°F | Every 2 to 3 days |
| In the ground, above 90°F | Every 1 to 2 days |
| Raised beds in a heat wave | Every day |
| Large pots, 5 gallons or more | Every day |
| Small pots or grow bags | Once or twice a day |
For the normal growing season, see our guide to watering tomato plants. This page covers the heat wave routine.
How to tell when tomatoes need water in the heat
Push a finger 2 to 3 inches into the soil beside the plant. If it is dry at that depth, water. The surface bakes dry within hours on a hot day, so never judge by the top inch alone.
Midday wilting is normal in the heat. Tomato leaves droop to cut water loss, then recover by evening. Leaves that are still limp the next morning mean the plant is truly short of water.
How to water tomatoes in a heat wave
- Water at dawn. The soil is cool, little water evaporates, and the plant is ready for the afternoon.
- Water slowly at the base. A drip line or soaker hose keeps the leaves dry and delivers water to the roots.
- Soak deeply. Aim for moist soil 6 to 8 inches down, not a quick splash.
- Mulch 3 inches deep. Straw or shredded leaves keep the soil several degrees cooler and cut evaporation sharply.
Signs of overwatering and underwatering
Too much water
- Split or cracked fruit after a big soak
- Yellow lower leaves in soggy soil
- Watery, bland tomatoes
- Stem base turning soft
Too little water
- Leaves still limp in the morning
- Dark, sunken patch on the fruit bottom
- Flowers dropping without fruit
- Curled, crispy leaf edges
Shade, mulch and pots in extreme heat
When temperatures stay above 95°F, 30 percent shade cloth over the plants in the afternoon can lower stress and help flowers set fruit. Pick fruit that is turning pink, since very hot weather can stop fruit from coloring properly.
Pots heat up the most. Move them to a spot with afternoon shade, or wrap black pots in a light cloth. For other crops sharing the bed, see our guide to the vegetable garden.
Tomatoes In Hot Weather watering FAQ
Should I water tomatoes every day in hot weather?
In pots, yes. In the ground, every 1 to 2 days during a real heat wave is enough, as long as each watering is deep.
Why are my tomatoes cracking in the heat?
Uneven watering is the usual cause. A dry spell followed by a heavy soak makes the fruit swell too fast. Keep moisture steady and mulch the bed.
Is it okay to water tomatoes in the afternoon?
If a plant is badly wilted, yes. Otherwise, water at dawn, because much of an afternoon watering evaporates before it reaches the roots.
We turn horticulture research and real growing experience into plain-English watering schedules you can actually follow.