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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
SEPTEMBER 2017 (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 1005.6 31.7 27.9 26.1 24.6 83 85 6.5
2 1004.5 30.4 27.9 26.4 24.8 83 88 1.0
3 1005.4 29.9 27.3 25.6 25.1 88 88 23.8
4 1006.7 27.6 26.4 25.3 24.4 89 90 32.8
5 1008.5 30.7 28.3 25.9 25.8 87 83 6.4
6 1007.5 32.3 29.1 27.3 25.6 82 82 Trace
7 1008.2 30.7 28.5 27.5 25.4 84 86 1.8
8 1009.3 30.9 28.4 26.9 25.2 83 64 1.1
9 1009.0 32.0 28.1 26.0 25.5 86 77 25.8
10 1010.1 32.2 29.1 26.7 25.3 81 68 Trace
11 1009.7 32.4 29.8 27.6 24.9 75 30 -
12 1009.3 32.8 29.9 27.9 25.5 77 51 0.6
13 1009.5 34.0 30.0 28.3 24.4 73 71 -
14 1008.5 31.5 29.0 27.6 21.5 64 76 -
15 1009.5 33.2 29.4 27.8 24.8 77 76 Trace
16 1009.9 32.6 29.9 27.7 24.3 73 52 -
17 1009.4 32.6 30.1 28.5 24.5 72 36 -
18 1009.8 32.9 29.7 27.8 24.8 75 30 -
19 1010.2 32.2 29.1 27.6 24.1 75 39 -
20 1009.3 32.0 29.3 27.6 25.1 78 73 0.2
21 1008.6 32.0 29.4 27.9 25.3 79 70 Trace
22 1009.9 32.0 29.1 26.1 25.9 83 72 17.9
23 1010.8 31.4 29.0 26.7 26.1 85 75 33.4
24 1008.8 30.5 28.8 27.1 25.7 84 81 5.6
25 1010.1 31.9 29.4 27.7 25.8 81 81 0.5
26 1011.0 32.9 29.7 27.8 25.4 78 41 -
27 1009.6 33.0 29.9 27.7 25.6 78 34 -
28 1009.2 34.1 30.3 28.2 24.6 72 25 -
29 1012.2 33.1 30.2 28.8 25.8 78 63 Trace
30 1013.7 30.3 28.3 25.9 25.6 86 72 35.0
Mean/Total 1009.1 31.9 29.0 27.2 25.0 80 65 192.4
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 2017 (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 7 2.4 11.11 3.0 290 10.3
2 5 1.1 11.18 2.8 270 10.5
3 2 0.8 8.61 1.7 270 24.7
4 0 0.2 5.63 0.6 240 38.8
5 0 2.6 10.46 1.5 180 12.2
6 0 7.2 17.36 3.0 190 7.2
7 0 1.1 9.01 1.4 280 5.2
8 0 6.5 15.32 2.7 180 9.9
9 0 4.0 12.98 4.9 160 10.5
10 0 8.3 21.99 4.8 190 10.5
11 0 10.8 22.85 5.1 200 9.3
12 5 5.8 13.89 3.6 050 7.8
13 0 8.6 19.15 5.8 070 33.3
14 0 6.8 17.82 3.9 070 36.0
15 0 4.9 15.96 3.6 070 15.2
16 3 10.6 20.83 5.1 260 15.3
17 3 8.5 16.75 3.6 270 9.8
18 0 10.9 22.55 5.1 090 14.5
19 0 9.3 22.21 4.6 090 16.1
20 0 6.8 16.12 3.2 090 15.0
21 0 7.9 15.01 3.0 080 13.2
22 0 6.9 17.39 3.6 080 24.2
23 0 5.5 16.63 3.7 080 30.3
24 0 2.4 9.99 2.3 100 39.8
25 0 5.4 15.48 2.1 120 26.5
26 0 9.6 20.13 4.3 120 9.8
27 1 7.9 14.69 3.0 200 6.2
28 0 10.9 21.67 4.3 130 7.7
29 0 8.9 21.42 5.3 090 21.1
30 0 4.5 10.38 2.2 080 34.7
Mean/Total 26 187.1 15.82 103.8 080 17.5
Normal* 81.2§ 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 1002.8 hectopascals at 1521 HKT on 2 September.

The maximum air temperature recorded at the Hong Kong Observatory was 34.1 degrees C at 1358 HKT on 28 September.

The minimum air temperature recorded at the Hong Kong Observatory was 25.3 degrees C at 0612 HKT on 4 September.

The maximum gust peak speed recorded at Waglan Island was 81 kilometres per hour from 250 degrees at 0940 HKT on 4 September.

The maximum 1-minute mean rainfall rate recorded at King's Park was 120 millimetres per hour at 0750 HKT on 23 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

§ 1997-2016 Mean value

Last revision date: <04 Oct 2017>