The recommended wind speed at which you should take down your patio umbrella can vary depending on its design, construction, and the specific manufacturer's guidelines. However, as a general guideline, it is advisable to take down a patio umbrella when wind speeds exceed 10-15 mph (16-24 km/h).
Typically, patio umbrellas are not designed to withstand high winds, and strong gusts can easily cause them to become unstable or even lift off. The risk of damage increases significantly as wind speeds increase. It's important to use your judgment and take into account factors such as the umbrella's size, stability, the presence of gusts, and local weather conditions.
If you're experiencing windy conditions, it's best to err on the side of caution and take down or secure your patio umbrella to prevent any potential accidents, damage to the umbrella, or injury to people nearby. Additionally, some patio umbrellas come with wind vents or other features designed to enhance their stability in moderate wind conditions, so it's recommended to check the specific guidelines provided by the manufacturer for your particular umbrella.