When to Check the Weather Before Flying a Drone: A Timeline
Checking the weather once, the night before, is how most drone flights get cancelled on site — or worse, flown in conditions that turned out to be different. Forecasts improve as the flight gets closer, and each stage gives you different information. Here is a timeline that fits a hobby flight and scales up to a commercial job.
5–7 days out: the trend
Goal: know whether the week looks broadly flyable.
- Look at the overall pattern: a windy spell, a settled high, a series of fronts.
- Don't trust individual hours this far ahead; the forecast for a specific hour can shift by many hours.
- For commercial work, this is when you pencil in a primary day and a backup.
Use: the Flight Window for the day you have in mind (up to 7 days ahead), and turn on an alert so you're told when it becomes flyable.
2–3 days out: pick the day
Goal: choose the best day and roughly the best hours.
- Compare wind and gusts at 10 m and at height across the candidate days.
- Look at rain type: steady rain is easy to plan around; showers are not. See why a low chance of rain isn't always good.
- Check the airspace: any restrictions, events or temporary closures planned. See the airspace guide and NOTAMs for drone pilots.
- Tell clients or landowners which day is the target and which is the reserve.
The day before: provisional go / no-go
Goal: make a provisional decision and prepare.
- Go through the forecast hour by hour for your flying window: wind and gusts, wind at altitude, rain amount and type, visibility, temperature, Kp and daylight. The meteogram diagrams show all of them on one timeline.
- Look for fog risk if the night will be clear and calm and the air is humid. See can you fly a drone in fog.
- Check NOTAMs again — many are only published a day or two ahead. The NOTAM Reader translates the codes.
- Charge batteries (warm them first in winter), update firmware, and pack spares.
Morning of the flight: confirm
Goal: confirm the decision with the newest forecast and real observations.
- Forecasts are updated several times a day. The morning run is usually the most accurate for today.
- Compare with a real observation. If the nearest airport is reporting stronger wind than the forecast, assume the wind at height is stronger too. The Local Weather tool shows the nearest airport report next to the forecast. See weather station vs forecast.
- Check whether fog has formed and when it's expected to lift.
- Look at the afternoon: heating can strengthen gusts and build showers.
The last 1–2 hours: nowcast
Goal: make the real go / no-go.
In the last couple of hours, radar and observations beat the model — especially for showers, storms and fog.
- Radar: where is the nearest rain, how fast is it moving, and is it coming your way? The Drone Rain Radar answers exactly that for your take-off time and flight length.
- Observations: current wind and gusts at the nearest station.
- Thunderstorms: any within 15 km means no flight. See flying near a thunderstorm.
For commercial work, record what you checked at this point. The Pre-Flight Brief freezes the forecast, rain timing, nearest observation and your go/no-go into a timestamped record you can share. See what to document for commercial work.
On site: look up
Goal: check what the numbers can't show.
- Wind at the surface and aloft: trees, flags, water, smoke, and how fast low clouds move.
- Local effects: turbulence behind buildings and trees, wind speeding up over a ridge, a sea breeze setting in. See why wind direction matters.
- Sky upwind: building cumulus, darkening bases, a shelf cloud.
- Test hover: take off, hover at a few metres, then climb in steps and watch how hard the drone works.
- Run through the pre-flight checklist.
During the flight: keep checking
- Watch the drone's wind warnings and battery consumption.
- Compare ground speed out and back: a much slower return means a stronger headwind than expected. See how wind affects ground speed.
- Between batteries, look at the radar again.
- Set a hard landing time before showers or strong afternoon wind arrive.
A quick summary
| When | What to check | Main tool |
|---|---|---|
| 5–7 days | Trend, backup day | Flight Window |
| 2–3 days | Best day, airspace | Flight Window, Airspace |
| Day before | Hour-by-hour, NOTAMs, batteries | Diagrams, NOTAM Reader |
| Morning of | New forecast vs observation | Local Weather |
| Last 1–2 h | Radar, storms, final go/no-go | Drone Rain Radar, Pre-Flight Brief |
| On site | Local wind, sky, test hover | Checklist |
FAQ
How far in advance should I check the weather before flying a drone?
Start a few days ahead to pick the day, check again the day before and the morning of the flight, and make the final decision in the last hour or two using radar and live observations.
How accurate are drone weather forecasts?
For wind and temperature, a forecast for tomorrow is usually close; showers, thunderstorms, fog and wind in hilly terrain are much harder. That's why the last check before take-off should use observations and radar.
What should I check right before take-off?
Current wind and gusts (including at height), radar for rain and storms nearby, visibility, the airspace and NOTAMs, and a test hover on site.
Related: how to read a weather forecast before flying and why keep a drone flight log.
Sources
- US Federal Aviation Administration, Aviation Weather Handbook (FAA-H-8083-28) — forecast products and observations.
- US 14 CFR §107.49 — Part 107 preflight familiarization, which includes weather.
- Forecast, observation and radar data: Open-Meteo, NOAA Aviation Weather Center and RainViewer — see our Data Sources page.
This guide is general information for planning, not aviation regulation.