If you planning to travel to Portchester Castle, Portsmouth, England, United Kingdom, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 7:35 AM. The temperature feels like 56.349999999999994 with a humidity level of 79 so dress accordingly. Cloud coverage is 94 percent with visibility at 8.3 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling south-southwest at a speed of 18 MPH. At the end of the day don’t miss the sunset at 4:05 PM.