Forecast Cloud Cover

WXSIM total sky cover • 3-hourly okta forecast • local forecast time • Wed 4 Nov 14:00 to Wed 11 Nov 14:00
Live WXSIM CSV retrieved: Wed 4 Nov 2026 18:19:11 local
Wednesday 4 Nov
00:00
–
 
 
03:00
–
 
 
06:00
–
 
 
09:00
–
 
 
12:00
–
 
 
15:00
8/8
Sky 100%
Wed 4 Nov 15:00
8 oktas
WXSIM: 99.5%
18:00
8/8
Sky 100%
Wed 4 Nov 18:00
8 oktas
WXSIM: 100.0%
21:00
8/8
Sky 100%
Wed 4 Nov 21:00
8 oktas
WXSIM: 99.9%
Thursday 5 Nov
00:00
8/8
Sky 100%
Thu 5 Nov 00:00
8 oktas
WXSIM: 99.8%
03:00
8/8
Sky 95%
Thu 5 Nov 03:00
8 oktas
WXSIM: 94.6%
06:00
6/8
Sky 70%
Thu 5 Nov 06:00
6 oktas
WXSIM: 69.9%
09:00
4/8
Sky 50%
Thu 5 Nov 09:00
4 oktas
WXSIM: 50.1%
12:00
4/8
Sky 53%
Thu 5 Nov 12:00
4 oktas
WXSIM: 53.2%
15:00
6/8
Sky 77%
Thu 5 Nov 15:00
6 oktas
WXSIM: 76.5%
18:00
6/8
Sky 72%
Thu 5 Nov 18:00
6 oktas
WXSIM: 72.0%
21:00
6/8
Sky 69%
Thu 5 Nov 21:00
6 oktas
WXSIM: 68.9%
Friday 6 Nov
00:00
7/8
Sky 92%
Fri 6 Nov 00:00
7 oktas
WXSIM: 91.6%
03:00
7/8
Sky 91%
Fri 6 Nov 03:00
7 oktas
WXSIM: 91.2%
06:00
8/8
Sky 99%
Fri 6 Nov 06:00
8 oktas
WXSIM: 98.6%
09:00
8/8
Sky 100%
Fri 6 Nov 09:00
8 oktas
WXSIM: 99.9%
12:00
8/8
Sky 100%
Fri 6 Nov 12:00
8 oktas
WXSIM: 99.9%
15:00
8/8
Sky 99%
Fri 6 Nov 15:00
8 oktas
WXSIM: 98.5%
18:00
8/8
Sky 97%
Fri 6 Nov 18:00
8 oktas
WXSIM: 96.8%
21:00
8/8
Sky 99%
Fri 6 Nov 21:00
8 oktas
WXSIM: 99.2%
Saturday 7 Nov
00:00
8/8
Sky 100%
Sat 7 Nov 00:00
8 oktas
WXSIM: 99.6%
03:00
8/8
Sky 99%
Sat 7 Nov 03:00
8 oktas
WXSIM: 99.0%
06:00
8/8
Sky 100%
Sat 7 Nov 06:00
8 oktas
WXSIM: 99.8%
09:00
8/8
Sky 100%
Sat 7 Nov 09:00
8 oktas
WXSIM: 99.9%
12:00
8/8
Sky 99%
Sat 7 Nov 12:00
8 oktas
WXSIM: 99.3%
15:00
8/8
Sky 100%
Sat 7 Nov 15:00
8 oktas
WXSIM: 99.6%
18:00
8/8
Sky 100%
Sat 7 Nov 18:00
8 oktas
WXSIM: 99.9%
21:00
8/8
Sky 100%
Sat 7 Nov 21:00
8 oktas
WXSIM: 99.9%
Sunday 8 Nov
00:00
8/8
Sky 100%
Sun 8 Nov 00:00
8 oktas
WXSIM: 100.0%
03:00
8/8
Sky 99%
Sun 8 Nov 03:00
8 oktas
WXSIM: 98.6%
06:00
8/8
Sky 98%
Sun 8 Nov 06:00
8 oktas
WXSIM: 98.1%
09:00
7/8
Sky 87%
Sun 8 Nov 09:00
7 oktas
WXSIM: 86.9%
12:00
5/8
Sky 56%
Sun 8 Nov 12:00
5 oktas
WXSIM: 56.3%
15:00
6/8
Sky 71%
Sun 8 Nov 15:00
6 oktas
WXSIM: 70.9%
18:00
6/8
Sky 81%
Sun 8 Nov 18:00
6 oktas
WXSIM: 80.7%
21:00
6/8
Sky 70%
Sun 8 Nov 21:00
6 oktas
WXSIM: 70.2%
Monday 9 Nov
00:00
3/8
Sky 43%
Mon 9 Nov 00:00
3 oktas
WXSIM: 43.3%
03:00
1/8
Sky 10%
Mon 9 Nov 03:00
1 oktas
WXSIM: 9.7%
06:00
1/8
Sky 9%
Mon 9 Nov 06:00
1 oktas
WXSIM: 8.9%
09:00
1/8
Sky 13%
Mon 9 Nov 09:00
1 oktas
WXSIM: 13.3%
12:00
1/8
Sky 13%
Mon 9 Nov 12:00
1 oktas
WXSIM: 13.2%
15:00
1/8
Sky 11%
Mon 9 Nov 15:00
1 oktas
WXSIM: 10.6%
18:00
1/8
Sky 10%
Mon 9 Nov 18:00
1 oktas
WXSIM: 9.5%
21:00
0/8
Sky 4%
Mon 9 Nov 21:00
0 oktas
WXSIM: 3.7%
Tuesday 10 Nov
00:00
0/8
Sky 5%
Tue 10 Nov 00:00
0 oktas
WXSIM: 5.4%
03:00
0/8
Sky 4%
Tue 10 Nov 03:00
0 oktas
WXSIM: 3.7%
06:00
0/8
Sky 4%
Tue 10 Nov 06:00
0 oktas
WXSIM: 4.4%
09:00
2/8
Sky 23%
Tue 10 Nov 09:00
2 oktas
WXSIM: 23.0%
12:00
1/8
Sky 18%
Tue 10 Nov 12:00
1 oktas
WXSIM: 17.6%
15:00
0/8
Sky 4%
Tue 10 Nov 15:00
0 oktas
WXSIM: 3.9%
18:00
0/8
Sky 2%
Tue 10 Nov 18:00
0 oktas
WXSIM: 1.5%
21:00
0/8
Sky 1%
Tue 10 Nov 21:00
0 oktas
WXSIM: 0.9%
Wednesday 11 Nov
00:00
1/8
Sky 18%
Wed 11 Nov 00:00
1 oktas
WXSIM: 18.3%
03:00
1/8
Sky 18%
Wed 11 Nov 03:00
1 oktas
WXSIM: 17.7%
06:00
1/8
Sky 18%
Wed 11 Nov 06:00
1 oktas
WXSIM: 17.5%
09:00
2/8
Sky 31%
Wed 11 Nov 09:00
2 oktas
WXSIM: 30.9%
12:00
6/8
Sky 73%
Wed 11 Nov 12:00
6 oktas
WXSIM: 72.9%
15:00
–
 
 
18:00
–
 
 
21:00
–
 
 
Cloud amount:
0/8
1/8
2/8
3/8
4/8
5/8
6/8
7/8
8/8
0 oktas = clear sky; 8 oktas = complete cloud cover. WXSIM percentage values are converted to the nearest eighth. The 9-okta “sky obscured” code is not generated from WXSIM percentage cloud cover.

WXSIM v Weather Underground — Day & Night Cloud Cover

Day = 07:00–19:00, Night = 19:00–07:00. WXSIM sky cover is averaged over the same period as each WU forecast period, then both are converted to oktas the same way. WU forecast retrieved Wed 4 Nov 18:19 (refreshed every 30 minutes).
DateDay 07:00–19:00Night 19:00–07:00
WXSIMWUDifferenceWXSIMWUDifference
Wed 4 Nov
8/897%
part period
 period passed —
8/894%
7/893%
 +1 okta
Thu 5 Nov
5/862%
6/871%
 -1 okta
7/884%
7/886%
 0 oktas
Fri 6 Nov
8/899%
8/895%
 0 oktas
8/899%
7/889%
 +1 okta
Sat 7 Nov
8/8100%
8/894%
 0 oktas
8/899%
7/883%
 +1 okta
Sun 8 Nov
6/874%
3/840%
 +3 oktas
3/838%
4/846%
 -1 okta
Mon 9 Nov
1/812%
3/833%
 -2 oktas
0/85%
2/823%
 -2 oktas
Tue 10 Nov
1/812%
 not in WU forecast —
1/811%
 not in WU forecast —
Wed 11 Nov
4/852%
part period
 not in WU forecast — not in WXSIM run not in WU forecast —
Periods compared: 11
Same okta: 3 (27%)
Within 1 okta: 8 (73%)
Mean difference: 1.1 oktas
Difference = WXSIM − WU in oktas (positive = WXSIM cloudier). Blue = WXSIM, green = WU. The station does not observe cloud cover, so this compares the two forecasts with each other, not with an actual. A period already passed is no longer supplied by WU; "part period" means the WXSIM run covers less than three-quarters of it.