As of the 2000 census, the city of Portsmouth had a total population of 100,565, and a 2008 Census estimate showed the city’s population had slightly increased to 100,577.
Portsmouth, VA climate is warm during summer when temperatures tend to be in the 70′s and cold during winter when temperatures tend to be in the 40′s.
The warmest month of the year is July with an average maximum temperature of 86.80 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 32.30 degrees Fahrenheit.
Temperature variations between night and day tend to be fairly limited during summer with a difference that can reach 15 degrees Fahrenheit, and fairly limited during winter with an average difference of 16 degrees Fahrenheit.
The annual average precipitation at Portsmouth is 45.74 Inches. Rainfall in is fairly evenly distributed throughout the year. The wettest month of the year is July with an average rainfall of 5.17 Inches.
Crime Rate :
| Crime Type | 2006 Total | Per 100,000 People | National per 100,000 People | |
| Overall Portsmouth Crime Index |  |
5915 | 5846.8 | 4479.3 |
| Portsmouth Violent Crimes | |
870 | 860 | 553.5 |
| Portsmouth Murders | |
18 | 17.8 | 7 |
| Portsmouth Rapes | |
37 | 36.6 | 33.1 |
| Portsmouth Robberies | |
336 | 332.1 | 205.8 |
| Portsmouth Aggravated Assaults | |
479 | 473.5 | 336.5 |
| Portsmouth Property Crimes | |
5045 | 4986.8 | 3906.1 |
| Portsmouth Burglaries | |
1100 | 1087.3 | 813.2 |
| Portsmouth Larceny/Thefts | |
3591 | 3549.6 | 2601.7 |
| Portsmouth Motor Vehicle Thefts |  |
354 | 349.9 | 501.5 |