A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z
| Location | Type | Country | Continent | Website |
| Ohio | Area | United States of America | North America | weather-ohio.com |
| Oregon | Area | United States of America | North America | weather-oregon.com |
| Ottawa | City | Canada | North America | weather-ottawa.com |
| Oahu | Islands | United States of America | North America | weatheroahu.com |
| Oceania | Continent | Australia and Oceania | weatheroceania.com | |
| Oklahoma | Area | United States of America | North America | weatheroklahoma.com |
| Oman | Country | Oman | Asia | weatheroman.com |
| Oranjestad | City | Aruba | North America | weatheroranjestad.com |
| Osaka | City | Japan | Asia | weatherosaka.com |
| Oslo | City | Norway | Europe | weatheroslo.com |
| Ouagadougou | City | Burkina Faso | Africa | weatherouagadougou.com |
