In hot weather, the tomato bed would require more amount of water. And in hot weather, vegetables need even more water, up to a 1/2 inch extra per week for every 10 degrees that the average temperature is above 60°F. Typically, every 3 to 5 days depending upon how hot the weather is. Tomato plant roots can go pretty deep. This way the plants will be able to search their own water source, and you can water when you feel that the surface soil is getting dry. The soil needs to be damp at least 6 – 8 inches below the ground to stimulate root growth. Tomatoes grown in containers frequently need extra water. of soil feels dry to the touch. Container plants require more water than garden plants, as they heat up the soil and cause water to evaporate faster. Tips on keeping crops cool during hot weather . Water at the base of the plant. Avoid Overwatering Tomatoes in Summer Weather Tomato plants need an inch or two of water a week, and a deep soaking is better than a little water every day. A bush type tomato growing in a 5-gallon container needs water every day, sometimes twice a day during the hot summer months, and when the plant is actively producing tomatoes. In the current hot breezy weather it is probably best to water in the early evening. You don't want to spray the foilage too much since tomatoes tend to be susceptible to fungus. If the weather is hot, over 90 degrees Fahrenheit, then you should water the tomato plants two times a day. Yellow leaves on tomatoes are often a sign of overwatering or they could signal a soil deficiency. Too much water will suffocate plants’ roots. At the same time, cherry tomatoes often remain productive in very hot weather that causes the blossoms of larger-fruited varieties to drop off. So if your daytime high is 95 and nighttime low is 70, the average is 82.5. How often should tomatoes be watered in hot weather? How often do you water tomatoes in pots? When days hit 85°F to 90°F and nights hover above 75°F, tomato flowers often fail to pollinate, then drop — which in turn puts new fruit production on hold. How often you water tomatoes is a major concern most people face, especially the first time around. Hot climate tomatoes are going to need plenty of water. Regular watering helps prevent tomatoes from developing cracks. Water whenever the top 1 inch (2.5 cm.) In short, hot weather can delay your tomato crop. Factors such as weather conditions, soil conditions, and type of plant, play a role in determining the water requirements of tomato plants. It is important to have the soil moist, not flooded. How often to water tomatoes in a raised bed is usually a major source of concern for people who grow tomatoes, especially the first time growers, because tomatoes require a lot of water to thrive. Make sure that you spread the water around so that it does dilute the nutrients present in the soil. 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