How to get future weather with E+ Python API

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Read the documentation on datatransfer.DataExchange. Here's an extract:

• today_weather_outdoor_dry_bulb_at_time
• tomorrow_weather_outdoor_dry_bulb_at_time

As a side note, you're using python, so you could also just parse the EPW yourself, retrieve the current simulation time, and do the lookups yourself. That'd allow you to lookup further than 1 day in the future if needed.