Sydney vs Seattle

How to read the comparison chart

The grouped bars score each city 0–100 on cost, climate and safety — taller is better. Sydney leads on any axis where its bar is higher, Seattle where its is. The cost bar uses a higher-is-cheaper scale, so Seattle's taller cost bar reflects its lower cost of living, not a higher price.

Sydney vs Seattle: the short answer

Seattle comes out ahead on overall livability (59/100), only marginally above Sydney (57/100). The two cities diverge most on cost of living. On affordability Seattle is the cheaper base — a moderate gap on our cost index (Sydney 5 vs Seattle 19, where a higher score means a lower cost of living, normalised from World Bank price levels). For climate, Sydney runs warmer in summer (about 22.6°C peak vs 18.6°C in Seattle), while winter lows sit near 12.4°C in Sydney and 4.5°C in Seattle. On natural-disaster exposure Sydney is the safer choice (safety 73/100); the dominant modelled hazard is storms (hurricane/cyclone) for Sydney and wildfire for Seattle.

Which city should you choose?

• On a tight budget → Seattle — lower everyday costs.
• You want warmth → Sydney — hotter summers.
• Safety is the priority → Sydney — lower disaster risk.
• Best all-rounder → Seattle — highest overall livability.

Data & methodology

Cost scores are normalised from World Bank price-level data. Climate figures (summer highs, winter lows) are drawn from 1991–2020 climate normals. Disaster-safety blends USGS earthquake history (magnitude 4.5+ within 300 km since 1980), tropical-cyclone basin position, flood/elevation exposure and Köppen climate zone. The livability score is the weighted composite of cost, climate and safety. All figures are planning indicators for 2026, not guarantees — verify specifics before relocating.

Compiled by the CityLivably data team from open public datasets (World Bank, USGS, climate normals).

FAQ

Is Sydney or Seattle better to live in?

Seattle scores higher overall — 59 vs 57 on our 0–100 livability index, which weights cost, climate and safety.

Which is cheaper, Sydney or Seattle?

Seattle has the lower cost of living (cost index 19 vs 5; higher = cheaper, from World Bank price levels).

Which is warmer, Sydney or Seattle?

Sydney — summer highs reach about 22.6°C versus 18.6°C in Seattle.

Which is safer from natural disasters, Sydney or Seattle?

Sydney (disaster-safety 73/100). Main hazard: storms (hurricane/cyclone) in Sydney, wildfire in Seattle.

What is the main natural-disaster risk in Sydney?

storms (hurricane/cyclone) is the dominant modelled hazard for Sydney on our risk index.

How is the Sydney vs Seattle comparison calculated?

Cost comes from World Bank price levels, climate from 1991–2020 normals, and disaster risk from USGS earthquake data, cyclone-basin position and flood exposure; livability is their weighted composite.