How To Fly a Flag in a Thunderstorm (and When Not To)

Summer storms roll in fast. One minute the sky is clear, the next the wind is gusting and lightning is cracking across the horizon. If you have a flag flying on a flagpole, the question hits quick: should you take it down or leave it up?

The answer depends on the flag, the pole, and the severity of the storm. The U.S. Flag Code gives clear guidance, but it leaves some room for judgment. Here is how to handle it.

What the U.S. Flag Code Says About Weather

Section 6(c) of the U.S. Flag Code states that the flag should not be displayed during inclement weather, except when an all-weather flag is used. That single sentence covers rain, snow, sleet, and storms. The key phrase is "all-weather flag," which refers to flags made from materials designed to withstand moisture and wind without degrading quickly.

The Flag Code does not specifically address thunderstorms, lightning, or severe weather warnings by name. It groups all bad weather under "inclement weather" and puts the decision on the flag owner: if your flag is all-weather rated, you can leave it up. If not, bring it in. You can review the full flag etiquette guidelines for additional display rules.

When It Is OK To Fly Your Flag in the Rain

All-Weather Flag Materials

Nylon and polyester flags are considered all-weather. Nylon is lightweight, dries fast, and holds up in moderate wind and rain. Polyester is heavier and more durable, built for sustained wind and harsh conditions. Either material qualifies under the Flag Code for use during rain and overcast weather.

Cotton flags are not all-weather. They absorb water, take longer to dry, and mildew faster. If you are flying a cotton flag, bring it in at the first sign of rain. Colonial Flag carries a full selection of all-weather flags in both nylon and polyester.

Proper Lighting at Night

If a storm moves through in the evening and you leave your flag up overnight, the Flag Code also requires illumination. A dedicated flagpole light or a nearby porch light that keeps the flag visible satisfies this requirement. If your setup does not include lighting, the flag should come down at sunset regardless of weather.

When You Should Take Your Flag Down

High Winds and Lightning

Thunderstorms are a different situation from a steady rain. Lightning poses a real safety risk, especially with metal flagpoles. A metal pole standing taller than its surroundings can attract a lightning strike. While most residential flagpoles are not tall enough to be the highest point on a property, the risk increases in open yards without nearby trees or structures.

High wind during a thunderstorm accelerates flag wear dramatically. Sustained gusts of 40 mph or higher can shred a flag in a single storm, especially at the fly end where the fabric snaps back and forth. If the National Weather Service issues a thunderstorm warning or severe weather alert for your area, bringing the flag down is the safest move for both the flag and anyone near the pole.

Hail and Severe Weather Warnings

Hail will damage a flag and the flagpole hardware holding it in place. Halyard ropes, pulleys, and snap hooks take a beating in a hailstorm. Severe weather warnings (tornado warnings, severe thunderstorm warnings with hail) are a clear signal to take the flag down and secure the halyard to prevent it from slapping against the pole.

How To Protect Your Flagpole in a Storm

Remove the flag and secure the halyard. A loose halyard banging against a metal or fiberglass pole during a storm creates noise, damages the pole finish, and can tangle or snap the line. Wrap the halyard tightly around the pole or clip it to the base cleat to keep it taut.

Telescoping flagpoles have an advantage here. They can be collapsed to a fraction of their full height in a few minutes, reducing wind load and lightning risk. If you live in an area with frequent summer thunderstorms, a telescoping pole is worth considering for exactly this reason.

For in-ground poles, check the foundation and ground sleeve after severe storms. High winds can loosen the pole in its sleeve, especially if the concrete base has cracked or shifted over time. A wobbly pole is a safety hazard and should be repaired before the flag goes back up.

What To Do if Your Flag Gets Damaged

If a storm damages your flag, inspect it before flying it again. Small frays at the fly end can sometimes be re-hemmed. Larger tears, holes, or significant fading mean the flag should be retired and replaced. Flying a tattered flag is considered disrespectful under the Flag Code.

Colonial Flag offers a flag repair and rotation program to help keep your display in good shape. If the flag is beyond repair, they can help you find a proper retirement option and a replacement.

Frequently Asked Questions

Can a flag attract lightning?

The flag itself does not attract lightning, but a tall metal flagpole can. Lightning tends to strike the tallest conductor in an area. If your pole is the highest point on your property, the risk is real during an active thunderstorm.

What wind speed is too high for a flag?

Most flags are rated for moderate wind (up to about 25 to 30 mph for nylon). Sustained winds above 40 mph will cause rapid wear and potential tearing. If the wind is strong enough to snap the flag audibly, it is too strong.

Should I take my flag down for every rainstorm?

Not if the flag is all-weather (nylon or polyester). Light to moderate rain is fine. Take the flag down for severe thunderstorms, hail, or any storm with high wind and lightning.

Get a Flag Built for Any Weather

An all-weather flag handles normal rain without a problem. Browse the full selection of American flags and flagpole accessories at Colonial Flag to make sure your setup is ready for whatever summer throws at it.