Guam's rainy season typically runs from July through November, but downpours can happen any time of year. Wet roads demand more from your vehicle, and a little preparation goes a long way toward preventing breakdowns and accidents when the weather turns.
Check Your Tires
Start with your tires. They're your only contact with the road, and on wet pavement, that contact is everything. Check your tread depth — insert a coin into the groove; if you can see the top of the figure, it's time for new tires. Also check your tire pressure monthly, as fluctuations in temperature affect it more than you'd think. Worn or underinflated tires are the leading cause of hydroplaning.
Replace Worn Wipers
Next, your wipers. If they're streaking, chattering, or leaving gaps, replace them before the rainy season starts. Guam's sun degrades rubber quickly, so wipers often need replacing every 6 to 12 months. Don't forget to top up your windshield washer fluid — you'll use more of it when the roads are wet and muddy.
Inspect Your Brakes
Brakes are critical. If you're hearing squealing, feeling a spongy pedal, or noticing your stopping distance has increased, get them inspected before the rain arrives. Wet brakes take longer to stop a vehicle, so any existing brake problem becomes amplified in the rain.
Test Every Light
Check your lights — all of them. Headlights, taillights, brake lights, and turn signals. Rain reduces visibility, and being seen is just as important as seeing. A burned-out bulb that's a minor annoyance in dry weather becomes a safety hazard in the rain.
Pack an Emergency Kit
Finally, keep an emergency kit in your vehicle: a flashlight, reflective triangles, a basic first-aid kit, and a charged phone. If you do break down in heavy rain, staying visible and calling for help quickly is your best move. Roadside Heroes is available 24/7 at (671) 864-HERO, rain or shine, anywhere on Guam.
Want to know where to drive with extra caution? See our guide to Guam's most dangerous roads and how to stay safe.
