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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
AUGUST 2018 (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 1004.6 32.4 29.9 27.9 25.7 78 76 2.7
2 1003.8 32.9 30.0 26.6 25.6 78 79 6.1
3 1003.4 31.8 30.1 29.1 25.6 77 86 Trace
4 1004.7 32.5 29.8 27.3 25.7 79 80 5.0
5 1005.9 33.1 30.3 28.9 25.8 77 84 0.5
6 1005.4 33.8 30.2 28.8 25.5 76 84 -
7 1004.4 34.2 30.0 28.4 25.6 78 78 -
8 1004.2 33.9 30.3 27.1 25.4 75 72 0.5
9 1003.3 33.6 30.4 29.2 25.1 74 79 Trace
10 1001.7 29.5 27.2 26.0 25.9 92 91 47.9
11 998.7 28.2 27.0 25.8 25.9 93 90 51.9
12 996.5 28.1 26.9 25.8 25.7 93 90 18.9
13 996.3 32.6 28.9 27.3 25.8 84 80 0.1
14 996.2 29.9 27.6 26.4 25.9 90 89 32.9
15 999.2 30.9 28.2 26.4 25.6 86 88 2.2
16 1000.1 29.0 27.8 26.7 25.9 89 88 3.2
17 1000.2 28.3 27.2 25.5 25.5 91 89 36.1
18 1001.4 30.9 28.4 25.9 25.3 84 88 21.8
19 1002.5 30.4 28.6 26.4 25.6 84 89 31.2
20 1002.3 30.5 27.8 26.1 25.7 88 91 61.1
21 1000.2 30.2 28.3 26.7 25.6 86 83 25.7
22 1000.1 31.8 28.5 24.7 25.2 83 71 26.4
23 1001.7 30.9 27.7 24.6 25.2 86 86 24.9
24 1001.6 31.9 29.1 25.6 25.6 82 83 0.1
25 999.8 32.9 30.3 27.8 24.8 73 66 -
26 999.5 31.4 28.9 25.5 24.4 77 86 80.2
27 1001.3 29.9 27.0 25.2 24.5 87 89 27.3
28 1002.2 29.2 26.3 25.2 24.9 93 93 71.6
29 1002.5 29.3 27.4 26.1 25.5 89 89 23.3
30 1005.5 28.9 28.0 26.9 25.6 87 90 6.3
31 1009.3 29.0 27.9 27.0 25.6 88 89 7.2
Mean/Total 1001.9 31.0 28.6 26.7 25.5 84 84 615.1
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 2018 (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 5.6 17.10 4.0 230 20.2
2 0 9.1 24.29 5.2 230 26.0
3 0 6.2 17.72 4.6 230 22.1
4 0 5.3 16.05 3.3 200 10.0
5 0 5.6 15.75 3.6 140 7.3
6 0 5.1 13.53 3.0 090 7.4
7 0 5.1 15.37 3.7 080 9.5
8 0 8.6 21.03 5.0 090 27.1
9 0 7.8 23.52 5.8 080 38.5
10 0 0.6 8.51 3.1 070 25.5
11 0 - 4.11 1.0 100 25.6
12 0 0.2 7.38 0.8 100 23.9
13 0 7.0 18.99 4.6 080 24.5
14 0 2.5 12.58 2.5 090 28.3
15 0 2.9 13.15 2.1 130 22.5
16 0 0.8 7.60 2.9 140 19.5
17 0 0.1 5.28 3.0 210 8.1
18 0 3.0 15.46 4.6 230 14.2
19 0 3.2 15.62 4.4 240 22.6
20 7 0.9 6.92 3.1 230 14.3
21 7 4.0 11.01 3.6 010 8.1
22 2 8.5 19.28 3.4 270 12.7
23 1 3.2 12.84 2.4 280 20.3
24 12 4.9 16.00 3.5 270 17.5
25 6 9.6 20.67 5.0 270 20.7
26 0 3.3 12.37 2.4 360 9.5
27 0 1.8 11.22 2.7 220 14.5
28 0 1.2 7.90 2.6 200 16.8
29 0 0.1 4.96 1.7 180 35.0
30 0 - 3.54 0.6 180 36.3
31 0 - 4.17 0.9 150 30.2
Mean/Total 35 116.2 13.03 99.1 230 20.0
Normal* 46.5§ 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 994.7 hectopascals at 1734 HKT on 12 August.

The maximum air temperature recorded at the Hong Kong Observatory was 34.2 degrees C at 1207 HKT on 7 August.

The minimum air temperature recorded at the Hong Kong Observatory was 24.6 degrees C at 0011 HKT on 23 August.

The maximum gust peak speed recorded at Waglan Island was 67 kilometres per hour from 200 degrees at 0218 HKT on 31 August.

The maximum 1-minute mean rainfall rate recorded at King's Park was 161 millimetres per hour at 0714 HKT on 11 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

§ 1997-2017 Mean value

Last revision date: <04 Sep 2018>