Weather Happy first day of summer, Portsmouth! June 21, 2018June 20, 2018 Sandy McGee 0 Comments Facebook0TwitteremailPORTSMOUTH, R.I. — Happy official first day of summer, Portsmouth! The summer solstice occurs at 6:07 a.m. on Thursday, June 21. Thursday also marks the last day of school (180 days) for all Portsmouth public schools. Have a great summer!