The two most common questions new drone pilots ask about weather are whether they can fly in rain, and how much wind is too much. The answers depend on your aircraft, your certification, and the specific FAA regulations that apply to your operation.
Here is a straightforward breakdown.
Rain: Hardware First, Regulations Second
Most consumer and prosumer drones are not waterproof. DJI rates some aircraft as water-resistant -- the Matrice 30 series, for example, carries an IP55 rating -- but the majority of popular models (Mini 4 Pro, Air 3, Mavic 3) are not rated for rain exposure. Flying them in rain risks water ingress into motors, ESCs, and camera gimbals.
Beyond hardware, Part 107 requires the remote pilot to maintain visual line of sight with the drone at all times. Rain significantly reduces visibility and can make maintaining visual contact impossible at operational distances.
Part 107 does not include a specific prohibition on rain operations. The relevant regulations are:
- 107.51(c) -- visibility of at least 3 statute miles from the control station
- 107.31 -- visual line of sight must be maintained without the aid of binoculars or other vision-enhancing devices
- 107.36 -- no careless or reckless operation
If rain reduces visibility below 3 SM at your location, flight is prohibited. If rain obscures your visual contact with the aircraft, flight is prohibited. If conditions make safe operation impossible, flight is reckless regardless of the visibility reading.
Fog: The Visibility Rule in Practice
Fog is the condition most likely to trigger the 3-SM visibility requirement in practice. Dense fog can reduce ground-level visibility to near zero while leaving the airspace a few hundred feet up relatively clear.
The visibility requirement under 107.51(c) is measured from your control station -- your position on the ground -- not from the drone's altitude. If you cannot see 3 statute miles horizontally from where you are standing, you cannot fly legally under Part 107, regardless of how clear the sky appears at altitude.
Light fog and mist create a more ambiguous situation. If visibility is 4 SM with light fog and you can maintain clear visual contact with the drone, operations may be legal. The pilot in command makes this determination and bears responsibility for it.
Practical guidance: if the METAR at the nearest airport shows visibility below 5 SM with FG or BR in the present weather field, evaluate conditions carefully before launching. If visibility is below 3 SM, do not fly.
The METAR panel in UAS SkyCheck shows current visibility at the nearest airport. This is a reference point, not a definitive reading at your exact location -- conditions can vary significantly between an airport sensor and a field site a few miles away.
Wind: Manufacturer Limits and Practical Limits
Every drone has a published maximum wind speed rating. For most DJI consumer aircraft this is approximately 10.7 m/s (24 mph). This is the speed at which the manufacturer says the aircraft can maintain stable flight -- it is not the speed at which comfortable or safe operation ends.
Practical wind limits for most commercial operations are lower than manufacturer maximums:
- 0-10 mph: Ideal conditions for photography, mapping, and precision work
- 10-15 mph: Acceptable for most commercial work; some drift in hover, plan accordingly
- 15-20 mph: Manageable for experienced operators; avoid for precision photography or close-proximity work
- 20-25 mph: Approach manufacturer limits; battery consumption increases sharply; significant drift; most operators ground operations
- 25+ mph: At or beyond manufacturer limits for most consumer aircraft; high risk of loss of control
Wind speed at ground level is rarely the same as wind speed at operational altitude. Wind typically increases with altitude. A light 8 mph breeze at the surface may be 18-20 mph at 200 ft AGL, particularly in open terrain or near coastal areas.
Check wind conditions in UAS SkyCheck before every flight. The weather panel shows wind speed at your GPS location from Open-Meteo gridded data, and gusts from the nearest METAR station. Wind shear -- significant speed or direction changes at different altitudes -- is flagged separately in the 12-hour forecast section.
Wind Shear
Wind shear is a sudden change in wind speed or direction over a short distance. It is particularly hazardous for small UAS because the aircraft may be in controlled flight in one wind layer and suddenly enter a dramatically different layer.
Indicators of potential wind shear conditions:
- Rapidly changing wind direction at ground level
- Large difference between surface wind and winds-aloft forecast
- Strong temperature inversions (common in California coastal areas in summer)
- Active weather fronts passing through
The wind shear section in UAS SkyCheck uses Open-Meteo forecast data to flag conditions where significant speed delta or direction shift is detected in the 12-hour forecast at your location.
Thunderstorms: Do Not Fly
No ambiguity here. Do not fly in the vicinity of thunderstorms. Lightning, severe turbulence, and violent wind shifts make operations near convective activity extraordinarily dangerous. The FAA requires pilots to avoid thunderstorm clouds by significant margins.
If the TAF or METAR shows TS (thunderstorm) or TSRA (thunderstorm with rain) in the forecast or current conditions, ground operations until the system has passed and conditions have stabilized.
Temperature: Battery Performance
Cold temperatures reduce lithium battery capacity significantly -- 15-25 percent reduction at temperatures near freezing, more in sub-zero conditions. Batteries that read 100 percent on a cold morning may behave as if they are at 75-80 percent during flight.
Warm batteries before flight when operating in cold conditions. Most manufacturers recommend keeping batteries at 20 degrees Celsius or above before use. The temperature section of UAS SkyCheck shows current temperature at your GPS location and flags freezing conditions.
Extreme heat (above 40C / 104F) also affects battery performance and motor efficiency. Limit flight duration and allow equipment to cool between flights in hot conditions.
A Pre-Flight Weather Decision Framework
Before launching in marginal conditions, answer these questions:
- Is visibility at my control station at least 3 statute miles?
- Can I maintain visual line of sight with the drone throughout the planned flight?
- Is wind speed within the manufacturer's rated limit with margin to spare?
- Are there any TFRs related to weather emergencies (wildfires, disasters) in the area?
- Is my hardware rated for the conditions I am about to fly in?
If any answer is no, ground the aircraft.
Check current METAR, visibility, wind speed, and wind shear forecast for your exact location before every flight at uas-skycheck.app.