Would like to share some information I found on NASA's website...
THE FOLLOWING ISS SIGHTINGS ARE POSSIBLE FROM WED JUN 09 TO THU JUN 24
SATELLITE LOCAL DURATION MAX ELEV APPROACH DEPARTURE
DATE/TIME (MIN) (DEG) (DEG-DIR) (DEG-DIR)
ISS Tue Jun 22/08:24 PM < 1 16 16 above SSW 16 above SSW
ISS Wed Jun 23/08:53 PM < 1 18 18 above NW 15 above NNW
ISS Thu Jun 24/07:42 PM 4 63 17 above SSW 17 above NE
ISS will be over Singapore for 4 mins on 24-June passing over a maximum elevation of 63 deg. Is this a decent time to be able to spot ISS, provided the sky is clear?