Question-and-Answer Resource for the Building Energy Modeling Community
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Normally, it is common practice to leave an extra datalogger outdoors while you are performing the measurements. Then you can replace the recorded temperature in a common EPW with that recorded by you datalogger - only for model calibration purposes.
To further approximate the "created EPW", you can look for a station nearby that records solar radiation and replace it as well. A good ressource is https://www.wunderground.com/, where you can get some hourly weather data, depending on the location. In your case, it should also be a good place to get outdoor temperature - keep in mind that sometimes temperature varies a few degrees from the closer station to your specific location, due to urban microclimates.
A third option, similar to what Aaron mentions, is trying to get the 2018 AMY - Actual Meteorological Year for that location, which is widely discussed here
