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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
SEPTEMBER 2018 (Table 1)

Date
September
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 1009.9 27.9 26.3 25.0 25.2 93 89 32.0
2 1007.9 29.9 26.8 24.6 24.5 88 76 9.8
3 1006.9 30.5 27.7 25.6 24.3 82 70 0.3
4 1005.7 32.0 29.1 27.0 25.3 80 40 -
5 1004.9 33.1 29.8 27.9 25.8 79 54 0.1
6 1005.4 31.8 29.6 28.2 26.1 82 77 -
7 1006.3 31.2 29.4 28.0 25.6 80 76 Trace
8 1008.6 29.6 27.4 25.6 23.8 81 86 24.6
9 1011.5 30.5 27.1 24.6 22.4 76 86 16.7
10 1012.5 28.3 26.1 24.3 22.4 80 83 0.2
11 1009.3 32.7 28.2 25.2 20.6 65 46 -
12 1007.7 28.7 27.8 26.9 23.6 78 87 Trace
13 1009.4 30.3 27.7 26.3 24.7 84 69 2.5
14 1009.2 31.7 28.8 26.7 24.6 78 72 -
15 1002.8 35.1 30.7 26.8 23.1 65 59 Trace
16 990.9 31.8 26.4 23.6 23.6 86 97 167.5
17 1008.6 30.4 27.5 25.8 25.4 89 93 12.0
18 1013.7 31.8 28.2 26.5 25.3 85 65 1.2
19 1012.7 31.4 28.6 26.2 24.0 77 43 -
20 1011.0 31.9 29.0 27.0 24.3 77 63 -
21 1011.6 31.9 29.2 27.4 23.4 71 33 -
22 1013.3 33.2 29.2 27.0 24.5 76 51 -
23 1013.1 32.4 29.0 27.6 24.7 78 76 Trace
24 1011.1 29.6 27.0 24.8 24.9 88 80 72.2
25 1009.9 30.2 27.0 24.8 23.1 80 82 34.5
26 1009.6 28.6 26.8 25.1 23.3 81 77 9.7
27 1009.8 30.2 27.3 26.0 22.9 77 88 Trace
28 1009.9 31.3 27.6 25.8 21.4 70 74 -
29 1008.9 31.3 27.4 24.3 18.8 60 26 -
30 1010.5 30.6 27.5 25.0 18.9 60 29 -
Mean/Total 1008.8 31.0 28.0 26.0 23.7 78 68 383.3
Normal* 1008.9 30.1 27.7 25.8 23.4 78 66 327.6
Station Hong   Kong   Observatory

EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
SEPTEMBER 2018 (Table 2)

Date
September
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 - 2.71 1.7 150 12.7
2 0 4.8 14.65 2.0 030 5.9
3 0 5.1 17.12 3.0 230 9.3
4 0 11.1 25.30 4.6 240 23.8
5 0 9.0 22.32 3.8 250 18.8
6 0 7.6 18.69 3.7 030 7.5
7 0 3.5 11.61 3.1 100 6.2
8 0 2.7 8.13 2.3 360 16.1
9 0 1.7 10.87 2.1 360 24.9
10 0 3.3 10.62 2.3 070 15.0
11 3 11.0 23.66 3.0 350 10.6
12 0 1.2 7.84 1.8 070 43.3
13 0 5.5 15.16 3.0 070 33.5
14 0 7.0 16.26 3.7 040 13.0
15 2 9.7 22.64 3.3 010 23.3
16 0 - 1.06 1.4 120 101.3
17 0 1.3 8.48 1.4 110 43.0
18 0 8.9 21.69 4.5 080 20.8
19 0 10.1 20.24 4.6 200 7.8
20 0 8.4 20.00 4.7 220 11.3
21 0 10.7 23.08 5.1 160 7.5
22 0 11.2 20.27 4.6 100 8.3
23 0 6.6 19.33 4.6 100 9.1
24 0 2.5 10.73 2.7 090 9.5
25 0 5.9 17.29 4.1 100 20.1
26 0 3.4 9.51 2.3 100 14.5
27 0 4.0 13.03 3.3 100 6.5
28 0 5.9 15.77 5.0 360 14.4
29 0 10.6 20.90 5.8 350 25.2
30 0 10.6 20.53 4.0 360 22.9
Mean/Total 5 183.3 15.65 101.5 090 19.5
Normal* 78.5§ 172.3 14.61 125.9 090 22.6
StationHong   Kong
International   Airport
King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 977.0 hectopascals at 1328 HKT on 16 September.

The maximum air temperature recorded at the Hong Kong Observatory was 35.1 degrees C at 1407 HKT on 15 September.

The minimum air temperature recorded at the Hong Kong Observatory was 23.6 degrees C at 1029 HKT on 16 September.

The maximum gust peak speed recorded at Waglan Island was 220 kilometres per hour from 050 degrees at 1014 HKT on 16 September.

The maximum 1-minute mean rainfall rate recorded at King's Park was 118 millimetres per hour at 0209 HKT on 25 September.

# 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: <03 Oct 2018>