If you're looking for another Weathermegood alternative, Atmo is worth a look. Atmo employs deep learning models to generate hyper-local forecasts with a high degree of accuracy, consuming data from sources like satellites and ground stations. It's geared for hyper-local details, which can be useful for your specific travel needs.
Another contender is Tomorrow.io, a weather resilience platform. It offers real-time and historical weather data, automated protocols and probabilistic forecasting. It's geared for businesses that need to assess weather risks and make decisions ahead of time, similar to Weathermegood for travel planning.
If you're looking for a more developer-focused option, Weather Machine aggregates weather data from multiple APIs into a single interface. It's good for businesses and developers who want to incorporate weather data into their apps without the hassle of managing multiple APIs. Weather Machine has advanced caching and a flexible pricing model.
Although not a weather forecasting tool per se, PlanTripAI offers a personalized AI travel assistant that creates itineraries based on your interests and budget. That can be a useful addition to your travel planning workflow, especially if you're organizing multiple trips.