Walvis Bay receives only 13.2 millimetres (0.52 in) average precipitation per year, making it one of the driest cities on earth. Despite its dry climate, the city is relatively humid. Average relative humidity throughout the year remains above 80%. The warmest month is February with average temperature 17.9 °C (64.2 °F), while the coolest months are August and September with average temperature 13.2 °C (55.8 °F). The diurnal temperature range is also low, averaging only 5.7 °C (10.3 °F).