Whistles only on windy days
The sound starts even when it is dry outside, usually from the lower elbow, extension, or open outlet.
Start here: Focus on outlet shape, loose straps, and any section that can flex in the wind.
Outdoor drainage noise
Downspout Whistles
Direct answer: A whistling downspout is usually caused by wind catching a sharp opening, a loose section vibrating, or water squeezing past a partial blockage or pinched elbow.
Most likely: Start by figuring out whether the whistle happens in dry wind, only during rain, or both. That split usually tells you whether you have an opening-shape problem, a loose connection, or a developing clog.
Stand outside and listen for the exact spot the sound starts. A clean metal or plastic tube normally does not sing on its own. Reality check: the noise is often coming from the last elbow or extension, not the tall vertical section. Common wrong move: stuffing the outlet with screen or foam to quiet it down, which usually creates a clog and makes overflow worse.
Don’t start with: Do not start by replacing the whole downspout run. Most whistles come from one bad joint, one loose strap, or one restricted section near the bottom.
Whistles in dry windLook first for a sharp-edged outlet, loose extension, or gap at an elbow joint.
Whistles only in rainCheck for a partial clog, crushed section, or buried outlet restriction before buying parts.
Last reviewed: 2026-04-05
What the whistle sounds like
Whistles only during rain
The noise starts when water is moving, then fades after the storm or after the gutter empties.
Start here: Look for a partial blockage, a pinched elbow, or a buried extension that is backing up.
Whistles in wind and rain
You hear it during storms, especially when gusts hit one wall of the house.
Start here: Check both for looseness and for a narrowed flow path near the bottom of the run.
Noise comes from one exact joint
The whistle is strongest at a seam, elbow, or extension connection instead of the whole downspout.
Start here: Inspect that joint for a gap, misalignment, or deformation that creates a narrow air or water passage.
Most likely causes
1. Loose downspout strap or loose joint
A section that can move a little will vibrate and whistle when wind passes a seam or when water pulses through it.
Quick check: Grab the downspout and extension by hand and see whether the noisy section shifts, rattles, or opens at a joint.
2. Sharp or misshapen outlet opening
A cut edge, bent flap, or slightly crushed extension end can act like a whistle mouth in crosswind.
Quick check: Look at the last open end and lower elbow for bent metal, cracked plastic, or an uneven opening.
3. Partial clog or restriction
Leaves, shingle grit, or a crushed section can force water through a narrow path and create a high-pitched sound during rain.
Quick check: Run water from a hose into the gutter or upper downspout and listen for the whistle as flow increases.
4. Buried or blocked discharge point
If the outlet cannot breathe or drain freely, air and water can pulse back through the downspout and make noise near the bottom.
Quick check: Check whether water exits strongly at the end, puddles near the outlet, or backs up in the lower elbow.
Step-by-step fix
Step 1: Pin down when the noise happens
Wind noise and flow noise look similar from the ground, but they point to different fixes.
- Listen during dry windy weather if possible, then again during a rain event or with a controlled hose test.
- Walk the full run from top to bottom and note the loudest point: upper elbow, wall straps, lower elbow, extension, or buried outlet.
- Watch for movement while the sound is happening. A section that chatters or flexes is usually part of the problem.
Next move: If you can tie the whistle to dry wind only, go after looseness and outlet shape first. If it happens only with water flow, move to blockage and restriction checks. If you cannot isolate the source from the ground, use a ladder only for a brief close look at the lower sections and visible joints, not for a full storm inspection.
What to conclude: The timing tells you whether air is singing across an opening or water is being forced through a narrowed path.
Stop if:
- The ladder would need to be set on muddy, sloped, or unstable ground.
- You would have to inspect near overhead service lines.
- The downspout is pulling away from the wall or fascia.
Step 2: Check the outlet, lower elbow, and extension for a whistle shape
Most downspout whistles start low, where wind hits an open end or where a bent elbow creates a narrow slot.
- Inspect the last elbow and extension opening for crushed corners, bent lips, cracked seams, or a jagged cut edge.
- Make sure the extension is not twisted so one side is pinched flatter than the other.
- If a slip joint has opened, realign it so the pieces seat fully and the opening is even.
- Tighten any loose fasteners at the lower straps or connector points so the section cannot flutter.
Next move: If the whistle stops after straightening and securing the lower section, you likely had an air-gap or vibration problem rather than a clog. If the shape looks good and the noise still appears mainly during rain, move on to checking for a restriction.
What to conclude: A clean fix here points to a bad opening shape or a loose section acting like a reed.
Step 3: Rule out a partial clog before replacing anything
A downspout can still drain some water and still whistle if leaves or grit have narrowed the path.
- Flush water from the top or from the gutter outlet and listen at the lower elbow and extension.
- Watch the discharge. A strong steady stream is normal. Surging, bubbling, or weak output points to a restriction.
- If the extension is removable, disconnect it and test the vertical downspout by itself, then test the extension separately.
- Clear loose debris by hand from accessible openings. Rinse with plain water until flow is smooth.
Next move: If the whistle disappears once debris is cleared or the extension is removed, the problem was a partial blockage or a restricted extension. If flow is strong and the whistle still happens in wind, go back to fit, support, and outlet shape. If flow is weak and the outlet is buried, the blockage may be farther downstream.
Step 4: Secure or replace the one section that is actually causing the noise
Once you know whether the problem is looseness, deformation, or a bad extension, you can fix the noisy piece instead of rebuilding the whole run.
- Replace a bent lower elbow if it stays pinched or misaligned after you straighten it.
- Replace a cracked or misshapen downspout extension if the outlet opening is acting like a whistle or the tube is crushed.
- Add or tighten a downspout strap where the run moves against the wall in wind.
- Use a downspout connector only if the joint itself is loose or no longer seats tightly.
Next move: Run another hose test or wait for the next windy period. If the section stays quiet and drains normally, the repair is done. If a new elbow or extension still whistles and discharge is weak, treat it as a downstream blockage issue rather than a bad part.
Step 5: Finish with the right next move if the whistle points to a bigger drainage problem
Some noisy downspouts are warning you about a buried clog or outlet blockage, not a bad visible part.
- If the visible downspout drains fine with the extension removed but whistles or backs up when reconnected, focus on the extension or buried outlet path.
- If the lower end gurgles, surges, or spits air and water back, inspect the discharge area for blockage, mud, or a buried line problem.
- If the downspout has separated while testing, secure it and address it as a disconnected downspout before chasing noise further.
- If storm water still backs up after the visible sections are corrected, move to the clogged buried downspout or outlet problem rather than buying more visible parts.
A good result: You end up fixing the actual restriction instead of masking the noise.
If not: If you still cannot isolate the source, have a gutter or drainage pro inspect the run during active flow.
What to conclude: Persistent whistling after visible repairs usually means the trouble is farther downstream than the noisy spot.
Replacement Parts
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FAQ
Why does my downspout whistle only when it is windy?
That usually means wind is catching a sharp opening, loose seam, or vibrating extension. Start at the lower elbow and outlet end, because that is where the whistle most often forms.
Why does my downspout whistle only during rain?
That points more toward a partial clog, a pinched elbow, or a blocked discharge point. Water is being forced through a narrowed path, which can make a high-pitched sound even if the downspout still drains some water.
Can I stop the noise by covering the outlet with screen?
Usually no. Covering the outlet often traps debris and creates the clog you were trying to avoid. Fix the shape, looseness, or blockage instead of choking the opening down.
Is a whistling downspout a sign of a clog?
Sometimes, but not always. If the sound happens only in wind, it is more often a loose or misshapen section. If it happens during water flow, a partial clog becomes much more likely.
Should I replace the whole downspout if it whistles?
Usually not. Most of the time one lower elbow, one extension, one loose strap, or one bad joint is the real problem. Replace the whole run only if multiple sections are damaged or no longer align.
What if the whistle is really coming from a buried outlet?
If the visible downspout drains fine when disconnected from the buried section, the buried outlet or line is the better suspect. At that point, treat it as a clogged buried downspout or outlet problem rather than a bad visible part.