Maintain the hothouse temperature between 60 to 90 degrees Fahrenheit, the range at which tomatoes set fruit. Those that live in very warm climates have had to deal with this aggravating fact in July and August as the tomatoes pretty much stop producing. You can grow a variety of warm loving plants in summer when a greenhouse is hot. When growing tomatoes, it helps to know the various temperature ranges for healthy plant growth. You can use many different materials to shade them. That means fewer fruit. Both sets of plants are standout choices for enduring heat waves, as they're already adapted to those conditions. It is essential that we know the best tomato plant temperature when planting. Higher than that causes your tomatoes to go into a perilous stage. But soil temperatures that exceed 95 degrees Fahrenheit by approximately 10 a.m. are too extreme for even the established tomato plant, according … Water and Mulch. Daytime temperatures consistently above 90° F or night time temperatures consistently above 75° F create all kinds of stress for tomato plants. The illustration below gives a good idea of the key temperature ranges for tomato plants. Check the greenhouse temperature in the morning; open the doors and vents before leaving for work if warm or hot weather is forecast. Although frost occurs, by definition, when the temperature drops to 0 ° C at 1.5 meters above the ground, this may or may not result in freeze damage to crops. I raised one side of the plastic up (rolled it up) about 4 feet and got the temp down to 77 with the fan too, but now the sun is out and on it so it is up to 87 again. 88 now. The Effect of Extreme Temperatures on the Tomato and Pepper Crop Freezing and chilling injury in tomato and pepper plants. I sure like this remote thermometer but I do go crazy trying to grow tomatoes. If it is too cold, it may damage the tomato plant or its fruit. If it is too hot, plant growth will slow down, and fruit will not set or form properly. The suggested temperature for growing your tomato plants are from 18 degrees centigrade to 26 degrees centigrade. It’s too hot for tomatoes to be pollinated. I’ve never tried to grow tomatoes in the Arabian desert, but I’ve grown plenty of them in Illinois and yeah, a consistent temperature of 35 C, being 96 F, is just too hot for tomatoes, plus the sun is too bright. Well-hydrated plants tend to tolerate cooler or near-freezing temperatures better than dry ones. Tropical plants like hot, sticky weather while xeriscaping (drough-tolerant) plants thrive in high-temperature climates that see little rain fall. Whenever it's over 90, be sure to give your plants plenty of water. Cacti and melon grow well in a hot greenhouse as they need a temperature of 71.6°F and 75.2°F respectively. But even more worrisome is the toll the heat takes on the plants. Yup, it sure is. How hot is too hot for tomato plants? 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