How to Read a Weather Forecast Before You Head Out

The forecast you read at home on Monday looks nothing like what the mountain weather briefing says on Thursday. The further in advance you plan and the more remote your destination, the more tools you need — and the less you should trust any single source.

The 72-Hour Rule

Weather models get meaningfully less accurate beyond 72 hours. For weekend trips, check the forecast Wednesday and again Friday morning. The gap between those two reads tells you how stable the pattern is: barely moved means predictable; dramatically changed means build margin into your plans.

National Weather Service vs. Consumer Apps

Weather.gov uses the same underlying model data as every consumer app, but gives you raw forecasts for specific grid points and elevations without algorithmic smoothing. For a mountain campsite at 9,000 feet, the NWS hourly forecast for that elevation is far more useful than a city-center forecast from a phone app. Look for the NWS zone forecast for your destination — it often contains wind and precipitation details that consumer apps compress into a single icon.

Elevation Changes Everything

Temperature drops roughly 3–5°F per 1,000 feet of elevation gain, and wind speeds increase dramatically above treeline. A comfortable 65°F forecast for the valley might mean 40°F and 25 mph winds at the summit campsite. Always check the wind forecast separately.

The Go/No-Go Decision

Make it based on conditions, not on whether you have the weekend blocked off. If a severe storm is forecast for Saturday night and your shelter is a three-season tent, that's a no-go. If it's a 30% chance of afternoon showers and you have a solid rainfly, that's a normal camping trip. Know the difference before you leave the trailhead.