Tomato crops want a daily average temperature around 72ºF. When temps consistently hit the 95-degree range, tomatoes tend to stop producing red pigments, which means typically red fruits may instead ripen to orange. Green tomatoes are chilling sensitive. Ideal conditions for ripening are 19°C to 21°C with 90% to 95%RH. If tomatoes are picked at mature green, store them in 66 to 70°F with 90 to 95% RH would encourage uniform ripening. Below, are a few tips that can help you prepare your plants to endure the stressful heat and humidity of steamy summer weather. When there is 95 percent relative humidity and air temperature is 60 degrees Fahrenheit, for example, a plant’s leaf only needs to be 59 degrees Fahrenheit for moisture to condense on it. 1) Top icing the products may be very effective keeping the temperature low and the product surface close to 100% humidity. Growing Temperatures for Tomatoes. Temperatures above 81°F reduce intensity of red color and reduce fruit shelf-life. Tomato . Besides the recommended levels it also shows at which level the humidity deficit becomes a vegetative action, and when it is a generative action. 3) Products sensitive to ethylene should not be stored together with products producing ethylene. Many tomato plant problems are caused by improper greenhouse temperatures. Best growing temperature. Room temperature, … Even heat-tolerant tomato plant varieties slow down when the temperature soars. Mulch Helps. Temperature-induced problems. The best daytime growing temperature for greenhouse tomatoes is 29.4 degrees Celsius (85 degrees Fahrenheit), because it facilitates the plant growing and fruiting properly. Storage >27°C reduces intensity of red colour, while storage <13°C retards ripening and can lead to development of chilling injury, particularly in tomatoes at the mature-green stage. Dr. Nadia Sabeh said if the plants experience high temperatures during the day, but the temperature can be cooled down during the night, as long as the average temperature is 72ºF, the tomato plants are happy. A layer of straw, compost, or grass-clipping mulch helps moderate soil temperature, so it doesn’t fluctuate so much. Optimal storage temperatures depend on the maturity stage of the tomatoes. Ideal storage conditions for tomatoes depend on the maturity stage of picking. Alas, most refrigerators are cooled to around 35°F to 38°F. Figure 1; Humidity Deficit for Tomatoes at 8-9 air exchanges per hour. That's a solid 20°F under the happy temperature of a ripe tomato. Air temperature affects several aspects of tomato development, including growth, photosynthesis, respiration, and physiological development.1 Temperature also affects relative humidity in that warm air can hold more water than cool air, and relative humidity is expressed as a percentage of the maximum amount of water that the air can hold.. Understanding the effects of temperature is … The minimum temperature to germinate tomatoes is 15ºC but germination will be faster and more certain at 20ºC to 24ºC. When high heat lingers with days above 100°F and nights over 80°F, most tomato ripening stops altogether. Tomatoes can tolerate a night time temperature falling to 13.5ºC but if the daytime temperature falls below 15ºC for a week or more, growth will be stunted at best and crops reduced. 2) Spraying with water may be effective by keeping the temperature low (evaporative cooling) and the surface 100% humid. 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