KODACHI / LAND, LIFE & EVIDENCE
Okinawa and Tokyo climate: temperature, rain and outdoor use
Compare observations over the same period. Temperature, rainfall and wind answer different questions; air temperature alone cannot determine pool comfort or the quality of a rainy-day stay.
A framework for the decision
- 01Comparable observations
- 02Site exposure
- 03Seasonal equipment
Editorial diagram. Confirm the sequence and responsibilities for the individual project.
01 / INSIGHT
Use the same climate normals
JMA’s 1991–2020 normals give January mean temperatures of 17.3°C in Naha and 5.4°C in Tokyo; August values are 29.0°C and 26.9°C. The gap varies by season. These are observation-site values, not averages for the entire prefectures.
EVIDENCE / 08
Compare the evidence
Naha and Tokyo observation sites, not prefectural averages. Normals are not forecasts; precipitation is not a count of rainy days.
Charts and tables can be scrolled horizontally.
Monthly mean temperature (°C) | 1991–2020 normals
Monthly precipitation (mm) | 1991–2020 normals
View the data table
| Month | Naha °C | Tokyo °C | Naha mm | Tokyo mm |
|---|---|---|---|---|
| 1 | 17.3 | 5.4 | 101.6 | 59.7 |
| 2 | 17.5 | 6.1 | 114.5 | 56.5 |
| 3 | 19.1 | 9.4 | 142.8 | 116.0 |
| 4 | 21.5 | 14.3 | 161.0 | 133.7 |
| 5 | 24.2 | 18.8 | 245.3 | 139.7 |
| 6 | 27.2 | 21.9 | 284.4 | 167.8 |
| 7 | 29.1 | 25.7 | 188.1 | 156.2 |
| 8 | 29.0 | 26.9 | 240.0 | 154.7 |
| 9 | 27.9 | 23.3 | 275.2 | 224.9 |
| 10 | 25.5 | 18.0 | 179.2 | 234.8 |
| 11 | 22.5 | 12.5 | 119.1 | 96.3 |
| 12 | 19.0 | 7.7 | 110.0 | 57.9 |
Chart compiled from the cited original tables. Values are available below and in the CSV.
02 / INSIGHT
Look at the months you intend to use
June precipitation normals are 284.4mm in Naha and 167.8mm in Tokyo. Annual totals conceal seasonal patterns. Rainfall volume is not the number of rainy days and does not forecast weather on a booking date.
03 / INSIGHT
Add the site and equipment conditions
An exposed terrace and a sheltered courtyard can feel different in the same weather. Discuss sunlight, wind and rain penetration with an architect. Tell pool contractors the intended season and water-temperature expectations; obtain operating-cost estimates for the actual equipment.
Before the consultation
| Item | What to establish |
|---|---|
| Period | Use the same 1991–2020 baseline. |
| Place | Distinguish the weather station from the site. |
| Use | Plan dining, changing and circulation on wet days. |
Sources and authorities
Original publications are in Japanese. Confirm property-specific conditions with the responsible authority.
Continue your research
Maintaining a coastal home: salt, humidity and outdoor equipment
Manage windows, railings, outdoor units and pool machinery separately. Material names alone do not establish longevity; connect product instructions with a practical local inspection arrangement.
10 / GUIDETyphoons, outages and cancellations: planning villa continuity
Prepare separately for an empty property and for guests in residence. Decide who monitors information, who can act locally and who determines whether guests can be received before conditions deteriorate.
14 / GUIDEWater, drainage, electricity and communications: checking villa infrastructure
Distinguish infrastructure nearby, permission to connect and sufficient capacity. Describe the proposed use and equipment when asking providers about water, drainage, power and connectivity.