Skip to main content
Hong Kong Observatory Brand Hong Kong - Asia's world city
GovHK Traditional Chinese Simplified Chinese Search
Search Site Map Contact Us
Print Version
Back
Print Version

EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
AUGUST 2017 (Table 1)

Date
August
Mean Pressure
(hPa)
Air   Temperature Mean
Dew Point
Temperature
(deg. C)
Mean
Relative
Humidity
(%)
Mean
Amount
of Cloud
(%)
Total
Rainfall
(mm)
Maximum
(deg. C)
Mean
(deg. C)
Minimum
(deg. C)
1 1001.4 33.2 30.5 28.3 26.7 80 88 5.9
2 1002.2 31.0 29.3 27.3 26.0 83 88 14.8
3 1001.8 29.8 27.8 25.3 25.6 88 90 66.7
4 1003.0 29.3 27.6 25.9 25.5 89 79 19.3
5 1005.5 34.0 30.0 27.1 26.1 80 46 0.9
6 1006.4 32.9 30.3 28.5 26.0 78 61 -
7 1006.3 33.0 30.5 27.3 25.9 77 66 6.9
8 1006.6 32.8 30.4 28.4 26.1 78 74 1.9
9 1006.1 31.0 29.6 26.3 25.9 81 85 14.3
10 1006.1 31.4 29.6 27.6 26.0 81 88 11.1
11 1007.6 31.6 30.0 28.9 26.1 79 82 3.5
12 1008.7 32.5 30.0 29.0 25.4 76 72 -
13 1009.1 32.4 29.8 28.6 25.1 76 59 -
14 1008.8 32.5 29.9 28.8 25.0 75 58 Trace
15 1008.4 32.9 29.8 28.1 24.6 74 66 0.2
16 1008.3 31.2 29.3 28.2 24.4 75 81 Trace
17 1009.1 33.0 29.9 27.9 24.5 73 71 -
18 1010.3 34.3 30.4 28.1 25.5 76 60 -
19 1009.8 34.0 30.6 28.4 24.5 71 61 -
20 1007.1 33.4 30.5 28.5 25.3 75 29 -
21 1003.2 34.5 31.3 28.6 25.5 72 42 -
22 999.7 36.6 30.9 28.0 26.1 76 74 2.0
23 996.9 29.5 26.9 25.4 24.8 89 93 67.1
24 1007.8 31.5 29.1 27.3 26.4 86 85 Trace
25 1008.3 32.7 29.2 27.8 25.6 81 81 0.1
26 1006.4 34.3 29.8 26.2 24.3 73 65 6.3
27 1004.3 26.9 25.6 24.0 24.6 95 89 165.3
28 1010.2 26.3 25.2 24.5 24.6 96 90 98.3
29 1010.1 31.4 28.2 24.6 24.0 79 34 -
30 1008.3 31.6 28.9 27.0 24.8 79 49 0.4
31 1007.3 32.8 28.9 26.2 24.3 77 80 4.1
Mean/Total 1006.3 32.1 29.3 27.3 25.3 80 70 489.1
Normal* 1005.2 31.1 28.6 26.6 25.0 81 69 432.2
Station Hong   Kong   Observatory

EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
AUGUST 2017 (Table 2)

Date
August
Number of hours
of Reduced
Visibility#
(hours)
Total
Bright
Sunshine
(hours)
Daily
Global Solar
Radiation
(MJ/m2)
Total
Evaporation
(mm)
Prevailing
Wind
Direction
(degrees)
Mean
Wind
Speed
(km/h)
1 0 4.6 15.34 7.3 230 30.7
2 0 1.9 11.37 2.4 230 15.5
3 0 0.9 11.04 3.2 070 6.2
4 0 1.4 7.55 1.0 240 11.2
5 0 8.9 21.49 4.3 160 7.1
6 0 11.0 26.17 5.9 240 19.1
7 0 10.3 26.09 5.9 240 24.6
8 0 8.3 23.23 5.5 240 33.1
9 0 1.6 11.24 2.5 240 35.4
10 0 2.5 12.82 2.8 230 30.5
11 0 5.0 14.21 3.4 220 23.2
12 0 9.9 24.05 5.3 230 24.7
13 0 8.6 23.61 5.2 230 22.5
14 0 9.4 22.99 5.2 240 23.6
15 0 9.6 23.92 5.1 240 17.6
16 0 7.3 17.96 4.3 250 9.4
17 0 10.3 21.83 4.6 220 6.4
18 0 7.9 20.18 4.1 130 6.5
19 0 10.2 24.65 5.5 030 7.7
20 0 10.2 25.47 5.7 250 13.6
21 0 10.1 23.55 5.3 260 19.2
22 3 7.3 18.32 5.1 020 14.9
23 0 0.1 2.22 1.4 160 59.7
24 0 7.0 21.09 3.9 110 23.6
25 0 5.9 17.34 3.7 060 18.6
26 0 9.9 25.58 5.2 060 28.3
27 0 - 1.50 1.9 160 62.0
28 0 - 2.97 0.7 140 17.1
29 0 11.1 24.59 4.6 020 11.8
30 5 7.3 15.74 3.0 240 9.9
31 0 6.9 17.33 3.9 350 6.7
Mean/Total 8 205.4 17.92 127.9 230 20.7
Normal* 48.4§ 188.9 15.63 134.9 230 19.4
StationHong   Kong
International   Airport
King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 986.3 hectopascals at 0939 HKT on 23 August.

The maximum air temperature recorded at the Hong Kong Observatory was 36.6 degrees C at 1400 HKT on 22 August.

The minimum air temperature recorded at the Hong Kong Observatory was 24.0 degrees C at 0514 HKT on 27 August.

The maximum gust peak speed recorded at Waglan Island was 193 kilometres per hour from 080 degrees at 0910 HKT on 23 August.

The maximum 1-minute mean rainfall rate recorded at King's Park was 140 millimetres per hour at 0448 HKT on 3 August.

# Reduced visibility refers to visibility below 8 kilometres when there is no fog, mist or precipitation.

   - The visibility readings at the Hong Kong International Airport are based on hourly observations by professional meteorological observers in 2004 and before, and average readings over the 10-minute period before the clock hour of the visibility meter near the middle of the south runway from 2005 onwards. The change of the data source in 2005 is an improvement of the visibility assessment using instrumented observations following the international trend.

   - Before 10 October 2007, the number of hours of reduced visibility at the Hong Kong International Airport in 2005 and thereafter displayed in this web page was based on hourly visibility observations by professional meteorological observers. Since 10 October 2007, the data have been revised using the average visibility readings over the 10-minute period before the clock hour, as recorded by the visibility meter near the middle of the south runway.

^ In case the data are not available from Waglan Island, observations of Cheung Chau or other nearby weather stations will be incorporated in computing the Prevailing Wind Direction and Mean Wind Speed.

* 1981-2010 Climatlogical Normal, unless otherwise specified

§ 1997-2016 Mean value

Last revision date: <04 Sep 2017>