RV tires can gain or lose several PSI throughout the day as temperatures change, but most owners only check pressure when it’s convenient — usually in the morning before traveling. Tire pressure increases roughly 1-2 PSI for every 10-degree temperature rise, which means tires properly inflated at 70°F morning temperatures can be significantly over-inflated by afternoon when pavement temperatures reach 120°F or higher.
This temperature swing matters more for RVs than regular vehicles because RV tires typically run closer to their maximum load ratings, leaving less safety margin for pressure variations. An over-inflated tire has a smaller contact patch with the road, leading to uneven wear patterns and reduced traction. Under-inflation is more dangerous, causing excessive flexing, heat buildup, and potential blowouts, especially when combined with heavy loads.
The industry standard is to check and set tire pressure when tires are cold — meaning the vehicle hasn’t been driven for at least three hours. But many RVers check pressure right before leaving in the morning and assume they’re good for the day. A better approach is checking pressure the evening before travel, when tires have been stationary long enough to reach ambient temperature but you still have time to address any issues.
Consider investing in a tire pressure monitoring system (TPMS) that tracks pressure continuously rather than relying on periodic manual checks. These systems alert you to gradual leaks or rapid pressure changes while driving, giving you advance warning instead of discovering a problem during a roadside inspection. For RVs carrying significant weight over long distances, the early warning capability justifies the cost.