Forecast Cloud Cover

WXSIM total sky cover • 3-hourly okta forecast • local forecast time • Mon 9 Nov 09:00 to Mon 16 Nov 09:00
Live WXSIM CSV retrieved: Mon 9 Nov 2026 09:39:18 local
Monday 9 Nov
00:00
–
 
 
03:00
–
 
 
06:00
–
 
 
09:00
8/8
Sky 99%
Mon 9 Nov 09:00
8 oktas
WXSIM: 99.0%
12:00
8/8
Sky 97%
Mon 9 Nov 12:00
8 oktas
WXSIM: 96.8%
15:00
5/8
Sky 57%
Mon 9 Nov 15:00
5 oktas
WXSIM: 56.5%
18:00
8/8
Sky 95%
Mon 9 Nov 18:00
8 oktas
WXSIM: 95.2%
21:00
8/8
Sky 100%
Mon 9 Nov 21:00
8 oktas
WXSIM: 100.0%
Tuesday 10 Nov
00:00
6/8
Sky 75%
Tue 10 Nov 00:00
6 oktas
WXSIM: 75.3%
03:00
6/8
Sky 71%
Tue 10 Nov 03:00
6 oktas
WXSIM: 70.8%
06:00
6/8
Sky 72%
Tue 10 Nov 06:00
6 oktas
WXSIM: 72.1%
09:00
3/8
Sky 31%
Tue 10 Nov 09:00
3 oktas
WXSIM: 31.4%
12:00
1/8
Sky 12%
Tue 10 Nov 12:00
1 oktas
WXSIM: 11.5%
15:00
1/8
Sky 17%
Tue 10 Nov 15:00
1 oktas
WXSIM: 16.5%
18:00
1/8
Sky 14%
Tue 10 Nov 18:00
1 oktas
WXSIM: 13.7%
21:00
3/8
Sky 36%
Tue 10 Nov 21:00
3 oktas
WXSIM: 36.4%
Wednesday 11 Nov
00:00
3/8
Sky 35%
Wed 11 Nov 00:00
3 oktas
WXSIM: 34.9%
03:00
2/8
Sky 27%
Wed 11 Nov 03:00
2 oktas
WXSIM: 27.3%
06:00
6/8
Sky 77%
Wed 11 Nov 06:00
6 oktas
WXSIM: 76.6%
09:00
8/8
Sky 96%
Wed 11 Nov 09:00
8 oktas
WXSIM: 95.5%
12:00
8/8
Sky 100%
Wed 11 Nov 12:00
8 oktas
WXSIM: 99.7%
15:00
8/8
Sky 100%
Wed 11 Nov 15:00
8 oktas
WXSIM: 100.0%
18:00
8/8
Sky 100%
Wed 11 Nov 18:00
8 oktas
WXSIM: 100.0%
21:00
8/8
Sky 100%
Wed 11 Nov 21:00
8 oktas
WXSIM: 100.0%
Thursday 12 Nov
00:00
8/8
Sky 100%
Thu 12 Nov 00:00
8 oktas
WXSIM: 100.0%
03:00
8/8
Sky 99%
Thu 12 Nov 03:00
8 oktas
WXSIM: 98.7%
06:00
8/8
Sky 97%
Thu 12 Nov 06:00
8 oktas
WXSIM: 96.7%
09:00
8/8
Sky 99%
Thu 12 Nov 09:00
8 oktas
WXSIM: 99.4%
12:00
8/8
Sky 100%
Thu 12 Nov 12:00
8 oktas
WXSIM: 99.8%
15:00
8/8
Sky 100%
Thu 12 Nov 15:00
8 oktas
WXSIM: 100.0%
18:00
8/8
Sky 100%
Thu 12 Nov 18:00
8 oktas
WXSIM: 100.0%
21:00
8/8
Sky 100%
Thu 12 Nov 21:00
8 oktas
WXSIM: 100.0%
Friday 13 Nov
00:00
8/8
Sky 100%
Fri 13 Nov 00:00
8 oktas
WXSIM: 100.0%
03:00
8/8
Sky 100%
Fri 13 Nov 03:00
8 oktas
WXSIM: 100.0%
06:00
8/8
Sky 100%
Fri 13 Nov 06:00
8 oktas
WXSIM: 100.0%
09:00
8/8
Sky 100%
Fri 13 Nov 09:00
8 oktas
WXSIM: 100.0%
12:00
8/8
Sky 100%
Fri 13 Nov 12:00
8 oktas
WXSIM: 100.0%
15:00
8/8
Sky 100%
Fri 13 Nov 15:00
8 oktas
WXSIM: 100.0%
18:00
8/8
Sky 100%
Fri 13 Nov 18:00
8 oktas
WXSIM: 100.0%
21:00
8/8
Sky 100%
Fri 13 Nov 21:00
8 oktas
WXSIM: 100.0%
Saturday 14 Nov
00:00
8/8
Sky 100%
Sat 14 Nov 00:00
8 oktas
WXSIM: 100.0%
03:00
8/8
Sky 100%
Sat 14 Nov 03:00
8 oktas
WXSIM: 100.0%
06:00
8/8
Sky 100%
Sat 14 Nov 06:00
8 oktas
WXSIM: 100.0%
09:00
7/8
Sky 91%
Sat 14 Nov 09:00
7 oktas
WXSIM: 90.9%
12:00
8/8
Sky 99%
Sat 14 Nov 12:00
8 oktas
WXSIM: 99.1%
15:00
8/8
Sky 100%
Sat 14 Nov 15:00
8 oktas
WXSIM: 100.0%
18:00
8/8
Sky 100%
Sat 14 Nov 18:00
8 oktas
WXSIM: 100.0%
21:00
8/8
Sky 100%
Sat 14 Nov 21:00
8 oktas
WXSIM: 100.0%
Sunday 15 Nov
00:00
8/8
Sky 100%
Sun 15 Nov 00:00
8 oktas
WXSIM: 100.0%
03:00
8/8
Sky 100%
Sun 15 Nov 03:00
8 oktas
WXSIM: 100.0%
06:00
8/8
Sky 100%
Sun 15 Nov 06:00
8 oktas
WXSIM: 100.0%
09:00
8/8
Sky 100%
Sun 15 Nov 09:00
8 oktas
WXSIM: 99.5%
12:00
8/8
Sky 100%
Sun 15 Nov 12:00
8 oktas
WXSIM: 99.8%
15:00
8/8
Sky 96%
Sun 15 Nov 15:00
8 oktas
WXSIM: 96.1%
18:00
8/8
Sky 99%
Sun 15 Nov 18:00
8 oktas
WXSIM: 98.7%
21:00
8/8
Sky 100%
Sun 15 Nov 21:00
8 oktas
WXSIM: 100.0%
Monday 16 Nov
00:00
7/8
Sky 89%
Mon 16 Nov 00:00
7 oktas
WXSIM: 89.0%
03:00
7/8
Sky 88%
Mon 16 Nov 03:00
7 oktas
WXSIM: 88.0%
06:00
5/8
Sky 65%
Mon 16 Nov 06:00
5 oktas
WXSIM: 64.8%
09:00
7/8
Sky 84%
Mon 16 Nov 09:00
7 oktas
WXSIM: 83.8%
12:00
–
 
 
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 Mon 9 Nov 09:39 (refreshed every 30 minutes).
DateDay 07:00–19:00Night 19:00–07:00
WXSIMWUDifferenceWXSIMWUDifference
Mon 9 Nov
7/882%
7/892%
 0 oktas
6/881%
7/887%
 -1 okta
Tue 10 Nov
2/823%
4/844%
 -2 oktas
3/839%
3/832%
 0 oktas
Wed 11 Nov
8/898%
6/876%
 +2 oktas
8/899%
8/894%
 0 oktas
Thu 12 Nov
8/8100%
7/890%
 +1 okta
8/8100%
6/877%
 +2 oktas
Fri 13 Nov
8/8100%
7/882%
 +1 okta
8/8100%
6/873%
 +2 oktas
Sat 14 Nov
8/897%
6/876%
 +2 oktas
8/8100%
5/862%
 +3 oktas
Sun 15 Nov
8/899%
 not in WU forecast —
7/888%
 not in WU forecast —
Mon 16 Nov
6/872%
part period
 not in WU forecast — not in WXSIM run not in WU forecast —
Periods compared: 12
Same okta: 3 (25%)
Within 1 okta: 6 (50%)
Mean difference: 1.3 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.