Fact · climate · 2022-07-22
Record maximum temperature at the Observatory
天文台最高氣溫紀錄
Figure and reference date
39.0°C on 22 July 2022
39.0°C（2022 年 7 月 22 日）
Notes and definition
The highest temperature since the Observatory began records in 1884. Extreme-heat days are updated annually by the HKO.
Other figures in this group (climate)
Figures in the same group are not necessarily additive — check the basis note above first. Climate.
| Item / 項目 | Figure / 數字 | As of / 時點 | Source / 來源 |
|---|---|---|---|
| Mean annual rainfall 平均全年雨量 | 2,431.2 mm 2 431.2 毫米 GovHK uses this long-term mean. Hong Kong in Figures 2026 also lists 1991–2020 normals; recorded rainfall in 2025 was 2,558.7 mm. | 1991-2020 | Hong Kong Fact Sheet |
| Annual mean air temperature (normal) 全年平均氣溫（正常值） | 23.5°C 23.5°C | 1991-2020 | Hong Kong in Figures, 2026 Edition |
| Record minimum temperature at the Observatory 天文台最低氣溫紀錄 | 0.0°C on 18 January 1957 0.0°C（1957 年 1 月 18 日） The lowest temperature at the urban Observatory; uplands and the countryside can be colder, per separate station records. | 1957-01-18 | Hong Kong Fact Sheet |
| Very Hot Weather days 酷熱天氣日數 | 53 days (2025; third most on record) 53 天（2025，有紀錄以來第三多） HKO Year 2025: days with max ≥33°C. | 2025 | Hong Kong Observatory: The Year 2025 |
| Hot nights 熱夜數目 | 54 nights (2025; third most on record) 54 天（2025，有紀錄以來第三多） HKO: nights with min ≥28°C. | 2025 | Hong Kong Observatory: The Year 2025 |
| Thunderstorm days in a year 全年雷暴日數 | 37 days (2025) 37 天（2025） HKO does not publish a year total for lightning; thunderstorm days used as proxy. | 2025 | Hong Kong Observatory: The Year 2025 |
Other figures from the same official source
These figures come from the same registered document: “Hong Kong Fact Sheet” (GovHK). Being in one document does not make them additive.
| Item / 項目 | Figure / 數字 | As of / 時點 | Source / 來源 |
|---|---|---|---|
| Population density 人口密度 | 6,870 persons per km² 每平方公里 6 870 人 As at mid-2025. Census and Statistics Department also publishes density by Hong Kong Island, Kowloon, and the New Territories and Islands. | 2025-06 | Hong Kong Fact Sheet |
| Philippine nationals present in Hong Kong 身在香港的菲律賓國籍人士 | 195,574 195 574 人 Immigration Department movement count for one day, not the stock of foreign residents with a right of abode, and not additive with census ethnicity figures. | 2025-12 | Hong Kong Fact Sheet |
| Indonesian nationals present in Hong Kong 身在香港的印度尼西亞國籍人士 | 182,215 182 215 人 Immigration Department movement count for one day, not the stock of foreign residents with a right of abode, and not additive with census ethnicity figures. | 2025-12 | Hong Kong Fact Sheet |
| Indian nationals present in Hong Kong 身在香港的印度國籍人士 | 39,587 39 587 人 Immigration Department movement count for one day, not the stock of foreign residents with a right of abode, and not additive with census ethnicity figures. | 2025-12 | Hong Kong Fact Sheet |
| Share of population who are Chinese 華人佔人口比例 | 91.6% 91.6% 2021 Population Census. | 2021 | Hong Kong Fact Sheet |
| Crude birth rate臨時 粗出生率 | 4.1 per 1,000 population 每千名人口 4.1 人 Provisional figure. | 2025 | Hong Kong Fact Sheet |
| Number of islands 島嶼數目 | 261 islands of 500 m² or more, excluding Hong Kong Island and Lantau Island 261 個（面積 500 平方米或以上，不包括香港島及大嶼山） | 2026-07 | Hong Kong Fact Sheet |
| Country parks and special areas 郊野公園及特別地區 | About 40% of land 約佔土地 40% | 2026-07 | Hong Kong Fact Sheet |
15 more figures come from the same document; see Climate.
Verified questions that cite this figure
What are Hong Kong’s record-high and record-low temperatures, and has it ever hit 40°C?
The Observatory’s record maximum is 39.0°C on 22 July 2022 — the hottest yet, but still below 40°C; the record minimum is 0.0°C on 18 January 1957. Countryside and highland sub-stations can read lower, which are separate station records, not the urban Observatory figure.
（已核對問題頁目前只有中文版；上面嘅英文標題同答案本身係資料檔嘅官方英文欄位。）
How to cite this figure
Hong Kong Story, “Record maximum temperature at the Observatory”, https://hongkongstory.org/en/facts/temp-record-high, data as at 2022-07-22 (retrieved ＿).
中文：香港紀事館，〈天文台最高氣溫紀錄〉，https://hongkongstory.org/facts/temp-record-high，資料時點 2022-07-22（查閱日期 ＿）。
Machine-readable: /api/v1/facts.json (id = temp-record-high) · OpenAPI 3.1 ·/llms.txt
Registered source
GovHK
Official document dated 2026-07; last checked by this site 2026-09-05.
This site is a secondary compilation: the official text prevails. If the figure above differs from the official document, the official document is correct.