The night starts from Maghrib time and goes on till Fajr time, while the day starts from after Fajr or sunrise according to another opinion, and continuous till sunset.
No, there is no issue at all with doing nikah contract outdoors, or in morning.
The only time it is makruh is when the moon being in the zodiacal sign of Scorpio (qamar fi al-'aqrab), and when the moon is absent (end of lunar month/beginning of lunar month), which is called al-mihaq.
The Istekhara is valid as far as the circumstances of the matter has not changed.
'if the matter has changed then another Istekhara can be seen.Wassalam.
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