Route turbulence forecast
London → Johannesburg
Turbulence forecast for flights from London Heathrow Airport (LHR) to OR Tambo International Airport (JNB).
Check flights on this route
Get a segment-by-segment turbulence forecast for any scheduled flight from LHR to JNB, with live wind and pilot reports.
Live status with real-time delays and cancellations.
What to expect on this route
Southbound · Great-circle bearing 154°
The route crosses mid-latitudes where the polar jet can influence flight conditions, though exposure is shorter than on genuine long-haul crossings. At tropical latitudes, convective turbulence from thunderstorms is the main driver - pilots generally route around storm cells, but afternoon/evening flights encounter more build-up than morning departures. A large portion of the flight crosses open ocean (Mediterranean), where upper-level conditions are generally smoother than over continental terrain.
- Ocean / water segments
- Mediterranean
Seasonal turbulence pattern
At tropical latitudes, convective (thunderstorm-driven) turbulence dominates during regional wet seasons and monsoon cycles, typically worst in the afternoon and evening.
- Peak turbulence
- Regional wet season (varies by location)
- Typically calmest
- Dry season
LHR → JNB turbulence FAQ
Is the London to Johannesburg flight usually bumpy?
Most of the 9,075 km route sits in the mixed band with moderate jet-stream exposure. Historically that means occasional clear-air turbulence at cruise altitude is normal, especially in winter.
When is the best time to fly LHR to JNB for a smooth flight?
Statistically, Dry season sees the calmest conditions for this corridor. Within any season, morning departures see less convective (thunderstorm-driven) turbulence than afternoon flights.
How long is the flight from LHR to JNB?
Block time is usually around 11h 03m direct, cruising at approximately FL410 (41,000 ft). Actual duration varies with winds - tailwinds can shave 15-30 minutes, headwinds can add 30+ minutes on this southbound sector.
How accurate is Turbcast's forecast for this route?
We use live NOAA Aviation Weather Center pilot reports (PIREPs), SIGMETs and AIRMETs, layered with physics-based Ellrod and Richardson-number calculations from Open-Meteo pressure-level wind and temperature data. If a source is unavailable for a waypoint we show an em dash rather than invent a value.
Related routes
Articles
More on London ↔ Johannesburg
Articles that unpack the factors driving turbulence on this type of route.
When Is Flight Turbulence Worst? A Month-by-Month Global Guide
Winter over the Atlantic, monsoon over Asia, summer over the US - turbulence has a calendar. Here's the month-by-month pattern for every major flight corridor, and the best months to book a smoother flight.
Read moreTurbulence Severity Levels Explained: What Light, Moderate, and Severe Really Mean
A pilot's guide to the four turbulence intensity categories, the EDR scale that underlies them, and what each level actually feels like in the cabin - with concrete examples.
Read moreWill Turbulence Crash a Plane? What the Aviation Safety Data Actually Shows
Short answer: almost certainly not. Here's the full engineering, historical, and statistical picture of how modern aircraft handle turbulence - including what the Singapore Airlines SQ321 incident really tells us.
Read more