The cost of living in Harrow varies based on lifestyle choices but generally includes several key expenses. Rent for a one-bedroom apartment in the town center averages around £1,200 to £1,600 per month, while outside the center, it can range from £900 to £1,300. Utilities, including electricity, heating, cooling, water, and garbage, typically cost between £100 and £160 per month. Internet services are around £30 to £45 monthly. Groceries and food expenses depend on individual preferences, with an average monthly cost for a single person being around £150 to £250. Dining at inexpensive restaurants costs about £12 to £18 per meal, while mid-range restaurants may charge £25 to £35 per person. Public transportation is quite accessible, with a monthly pass costing around £70. Additional costs for entertainment, clothing, and leisure activities can vary widely based on personal preferences and lifestyle choices.

Harrow has a temperate maritime climate characterized by mild winters (1°C to 7°C) and warm summers (12°C to 23°C). Spring temperatures typically range from 5°C to 15°C, with pleasant conditions as the season progresses. Autumn sees temperatures dropping from 15°C to around 8°C, often accompanied by increased rainfall and wind as winter approaches. The area experiences moderate rainfall throughout the year, with the wettest months generally occurring between October and January. While Harrow enjoys some sunshine, particularly in summer, overcast conditions are common, contributing to the lush greenery that the region is known for.

The nearest international airport to Harrow is London Heathrow Airport (LHR). The airport is located approximately 10 miles (16 kilometers) southeast of Harrow town center.