I'd hazard a guess that...

Meaning

I would guess that...

Examples

• John: Do you know what time the train arrives?
• Alice: I don't know for sure, but <b>I'd hazard a guess that</b> it's around 3 pm.
• John: Is that confirmed?
• Alice: No, but <b>I'd hazard a guess that</b> it will be close to that time based on the schedule.