Three city museums will close on Mondays to save cash which will also result in some staff being made redundant.
As of July 4, the City Museum, Dickens Birthplace and Cumberland House are all affected, but the D-Day museum in Southsea will remain open seven days a week. The museums will also still open on bank holiday Mondays.
No museums in the city will shut permanently.
Councillor Lee Hunt, Cabinet Member for Leisure, Sport and Culture, said: ‘For years Portsmouth has bucked the national trend and kept all city museums open on Mondays, but careful management of money means that none of our museums will shut - unlike many in other areas.
‘Sadly staff hours are being reduced and some are being made redundant to find the savings we have to make towards the national budget deficit left behind by the last government.
‘I’m pleased that we are still managing to open the museums up for six out of seven days, and that the D-Day museum opening is not affected at all.
‘We have also managed to increase the season of Southsea Castle from March until October. It is also free to visit thanks to partnership working with Yellow Kite Cafe.’