Are Garmin Forerunner 245 Waterproof? | Swim And Rain Limits

It’s rated to 5 ATM for swimming, so it handles rain and pool sessions, but it isn’t built for scuba or high-speed water impact.

You buy a running watch to wear all day, not to baby it. Then the first downpour hits, or you step into the shower still wearing it, and the question pops up: is this thing safe around water?

The Forerunner 245 is made for sweat, rain, and swim workouts. Garmin lists it as “Swim, 5 ATM” in its device specs, which is the clue that matters most when you’re deciding what you can do with it and what you should skip.

Water Rating Basics That Decide What’s Safe

Water ratings on watches aren’t a promise you can take the device to that depth and hang out there. They’re a lab pressure rating. “5 ATM” means the watch can handle pressure equal to 50 meters under controlled conditions, not real diving. In real water, movement, impacts, soap, sand, and heat change the stress on seals.

Think of the rating as a capability band. Rain, hand washing, and steady pool laps sit inside that band. Scuba diving sits outside it. High-speed surface impacts can also sit outside it, since a hard slap of water can create a quick pressure spike at seals and buttons.

Why The Word “Waterproof” Gets People In Trouble

Brands avoid “waterproof” because seals age. Temperature swings, soap, sunscreen, salt, and repeated button presses all add wear. A watch can be water-resistant today and less so after years of use, even if it still looks fine on the outside.

So the smarter question is: “What water situations match the rating, and what habits keep the seals happy?” That’s what we’ll walk through.

Are Garmin Forerunner 245 Waterproof? What The 5 ATM Rating Means

Garmin lists the Forerunner 245 and 245 Music with a water rating of “Swim, 5 ATM.” You can verify it right on the Forerunner 245 specifications page. That places it in the category of watches meant for surface swimming and everyday water exposure like rain and shower spray, within normal use.

What You Can Do With A 5 ATM “Swim” Watch

• Run in the rain: No special steps needed. Just rinse off grit later if the watch gets muddy.
• Wash hands and dishes: Splashes are fine. Try not to blast the watch with a high-pressure sprayer.
• Swim in a pool: It’s designed for it, and it has swim activity modes to match.
• Get caught in a shower: Water itself is fine, but soap and hot water deserve caution.

What The Rating Does Not Cover

• Scuba diving: Not the right tool. Diving gear uses different seals and testing standards.
• High-speed water sports: Wipeouts on a jet ski, tow sports, and hard surface impacts can stress seals.
• Hot tubs and saunas: Heat can expand materials and weaken gaskets, then cool water can pull moisture inward.

Real-World Situations People Ask About

Most water damage stories come from everyday moments, not a planned swim. These quick callouts will help you decide fast.

Pool Chlorine

Chlorine won’t melt the watch, yet it can dry out rubber gaskets over time. After a pool session, rinse the watch with fresh tap water, then dry it with a soft cloth. That tiny habit keeps buildup from living around buttons and the charging contacts.

Ocean Salt

Salt is rougher than pool water because it leaves crystals as it dries. Those crystals can sit in crevices and grind when you move the strap or press buttons. If you swim in the ocean, rinse the watch soon after you’re out and towel it dry. If sand is on the case, rinse first, then wipe.

Showering With Soap

Lots of people shower with their watch and never see a problem. Soap is still a risk factor because it can work into seams and lower surface tension, which makes it easier for water to creep past seals. Hot water also expands materials. If you do shower with it, keep it away from direct spray, skip button presses, and rinse the watch well afterward.

Button Presses Underwater

Pressing buttons can flex seals and create a path for water, especially if grit is present. For swim workouts, start the activity before you get in, then leave the buttons alone until you’re back out. If you need to use controls mid-swim, do it above water.

Charging Contacts

The Forerunner 245 uses a clip-on charger with exposed contacts. Water on the contacts is normal, yet charging while moisture is present is where trouble starts. Let the watch dry fully before charging, and wipe the contacts if they have sweat or salt crust.

Water Exposure Cheat Sheet For The Forerunner 245

This table groups the situations people run into most. Use it as a quick gut check.

Water Situation	Safe For This Watch	Notes To Keep It Sealing Well
Rain during runs	Yes	Wipe clean after muddy sessions.
Hand washing and splashes	Yes	Avoid strong jets aimed at the case.
Pool swimming	Yes	Rinse after to remove chlorine film.
Open-water swimming	Yes	Rinse after to remove salt and grit.
Shower with mild soap	Usually	Skip direct spray and button presses; rinse well after.
Cold plunge	Usually	Dry after; watch for lingering screen fog.
Hot tub soaking	No	Heat plus chemicals can age seals faster.
Sauna or steam room	No	Heat and steam stress gaskets over time.
Water skiing / jet ski wipeouts	No	High-speed impacts can exceed the rating.
Scuba diving	No	Not rated for diving pressure profiles.

If you want Garmin’s own wording on what water ratings mean across its devices, this page is the straight source: Garmin water resistance definitions.

Signs Your Watch Needs Extra Care

Most users never see an issue. Still, it pays to spot early warning signs. Water damage often starts small.

Fog Under The Screen

A little fog right after cold water can be normal if it clears fast. Fog that sticks around, grows, or returns often can signal moisture inside. If you see that pattern, stop water use and get the watch checked.

Buttons Feeling Gritty Or Stiff

Grit around a button can cut into a seal each time you press it. Rinse the watch under gentle running water, work the button a few times above water, then rinse again. If it stays stiff, keep the watch out of water until it’s sorted.

Charging Problems After A Swim

If the watch won’t charge or the connector feels finicky after water exposure, dry it fully and clean the contacts. A dry cotton swab works well. Avoid metal tools that can scratch.

Habits That Keep A 5 ATM Watch Working For Years

Water resistance is not only about the factory seal. It’s also about what you do every week. These habits take seconds, and they cut the odds of trouble.

Rinse After Salt Or Chlorine

Fresh water removes the stuff that dries into crystals or film. It also clears sunscreen residue, which can be oily and sticky.

Dry Before Charging

Charging on wet contacts is a common way to create corrosion. Pat the contacts dry, let the watch air out, then charge.

Use Gentle Cleaning, Not Harsh Chemicals

Skip solvent cleaners and strong sprays. Mild soap on the strap is fine. Rinse well and keep soap away from button seams when you can.

Avoid Hot Water And Steam

Heat cycles can change how gaskets sit. A hot shower or steam room is not the same as a cool pool. If you want the rating to last, keep the watch out of hot tubs and steamy rooms.

Swimming Setup Tips That Save Headaches

If you wear the Forerunner 245 in the pool, set it up so you don’t need to fuss with it while you’re wet.

Start The Swim Activity Before You Enter

Pick Pool Swim, set pool length, then start the timer. Once you’re in, focus on your strokes, not on fiddling with buttons.

Rinse And Wipe Right After

Rinse under a soft stream of fresh water, wipe the case and strap, then let it dry on a towel. This also keeps the strap from smelling funky.

Care Checklist After Any Wet Workout

This list is short on purpose. It covers the stuff that pays off.

After-Water Habit	Why It Matters	Do This
Rinse with fresh water	Clears salt, chlorine, grit	10–20 seconds under gentle tap water.
Dry the case and contacts	Reduces corrosion risk	Pat dry with a soft towel, then air dry.
Wait before charging	Prevents charging on moisture	Give it time to dry, then connect.
Avoid button presses while wet	Lowers seal stress	Set activities first, then leave controls alone.
Clean the strap	Stops odor and skin irritation	Rinse, then use mild soap on the strap only.
Store it dry	Stops trapped moisture	Don’t leave it in a damp gym bag.
Watch for screen fog	Catches leaks early	If fog persists, stop water use and seek service.

What To Do If You Think Water Got Inside

If you suspect internal moisture, act fast and keep it simple.

1. Stop water exposure: Keep it out of showers, rain, and pools.
2. Power it off if you can: Less heat and activity is better.
3. Dry the outside: Use a towel, then let it sit in a dry room.
4. Avoid heat tricks: Skip hair dryers and ovens. Heat can warp seals.
5. Get it assessed: A proper inspection beats guessing.

Stay inside the rating, rinse after salt or chlorine, and keep charging contacts dry. Do that, and the Forerunner 245 can handle sweaty runs, stormy weather, and lap sessions without drama.