Most potted orchids appreciate daytime temperatures between 65 and 75°F (18-24°C) and nighttime temperatures around 55 to 65°F (12-18°C). Some varieties, like the Phalaenopsis orchid, can tolerate slightly higher temperatures, but it's important to maintain a temperature difference between day and night to encourage blooming. Avoid exposing the plants to extreme temperature fluctuations or placing them near sources of heat or cold drafts.