Forecast Cloud Cover

WXSIM total sky cover • 3-hourly okta forecast • local forecast time • Mon 26 Oct 06:00 to Mon 2 Nov 06:00
Live WXSIM CSV retrieved: Mon 26 Oct 2026 09:49:53 local
Monday 26 Oct
00:00
–
 
 
03:00
–
 
 
06:00
0/8
Sky 0%
Mon 26 Oct 06:00
0 oktas
WXSIM: 0.0%
09:00
8/8
Sky 100%
Mon 26 Oct 09:00
8 oktas
WXSIM: 99.7%
12:00
8/8
Sky 100%
Mon 26 Oct 12:00
8 oktas
WXSIM: 100.0%
15:00
8/8
Sky 100%
Mon 26 Oct 15:00
8 oktas
WXSIM: 100.0%
18:00
8/8
Sky 100%
Mon 26 Oct 18:00
8 oktas
WXSIM: 100.0%
21:00
8/8
Sky 96%
Mon 26 Oct 21:00
8 oktas
WXSIM: 96.0%
Tuesday 27 Oct
00:00
8/8
Sky 96%
Tue 27 Oct 00:00
8 oktas
WXSIM: 96.3%
03:00
8/8
Sky 100%
Tue 27 Oct 03:00
8 oktas
WXSIM: 100.0%
06:00
7/8
Sky 83%
Tue 27 Oct 06:00
7 oktas
WXSIM: 83.0%
09:00
5/8
Sky 57%
Tue 27 Oct 09:00
5 oktas
WXSIM: 56.5%
12:00
4/8
Sky 50%
Tue 27 Oct 12:00
4 oktas
WXSIM: 49.5%
15:00
6/8
Sky 78%
Tue 27 Oct 15:00
6 oktas
WXSIM: 77.5%
18:00
7/8
Sky 90%
Tue 27 Oct 18:00
7 oktas
WXSIM: 90.1%
21:00
5/8
Sky 63%
Tue 27 Oct 21:00
5 oktas
WXSIM: 62.5%
Wednesday 28 Oct
00:00
7/8
Sky 87%
Wed 28 Oct 00:00
7 oktas
WXSIM: 86.7%
03:00
8/8
Sky 100%
Wed 28 Oct 03:00
8 oktas
WXSIM: 100.0%
06:00
8/8
Sky 99%
Wed 28 Oct 06:00
8 oktas
WXSIM: 98.8%
09:00
7/8
Sky 92%
Wed 28 Oct 09:00
7 oktas
WXSIM: 91.9%
12:00
5/8
Sky 60%
Wed 28 Oct 12:00
5 oktas
WXSIM: 59.6%
15:00
7/8
Sky 82%
Wed 28 Oct 15:00
7 oktas
WXSIM: 81.5%
18:00
8/8
Sky 99%
Wed 28 Oct 18:00
8 oktas
WXSIM: 98.9%
21:00
6/8
Sky 75%
Wed 28 Oct 21:00
6 oktas
WXSIM: 75.3%
Thursday 29 Oct
00:00
5/8
Sky 57%
Thu 29 Oct 00:00
5 oktas
WXSIM: 56.7%
03:00
6/8
Sky 69%
Thu 29 Oct 03:00
6 oktas
WXSIM: 68.8%
06:00
7/8
Sky 94%
Thu 29 Oct 06:00
7 oktas
WXSIM: 93.5%
09:00
8/8
Sky 96%
Thu 29 Oct 09:00
8 oktas
WXSIM: 96.4%
12:00
8/8
Sky 100%
Thu 29 Oct 12:00
8 oktas
WXSIM: 100.0%
15:00
8/8
Sky 100%
Thu 29 Oct 15:00
8 oktas
WXSIM: 99.9%
18:00
8/8
Sky 99%
Thu 29 Oct 18:00
8 oktas
WXSIM: 99.2%
21:00
8/8
Sky 99%
Thu 29 Oct 21:00
8 oktas
WXSIM: 99.0%
Friday 30 Oct
00:00
8/8
Sky 100%
Fri 30 Oct 00:00
8 oktas
WXSIM: 100.0%
03:00
8/8
Sky 99%
Fri 30 Oct 03:00
8 oktas
WXSIM: 99.4%
06:00
6/8
Sky 73%
Fri 30 Oct 06:00
6 oktas
WXSIM: 73.3%
09:00
7/8
Sky 93%
Fri 30 Oct 09:00
7 oktas
WXSIM: 92.9%
12:00
8/8
Sky 100%
Fri 30 Oct 12:00
8 oktas
WXSIM: 100.0%
15:00
8/8
Sky 97%
Fri 30 Oct 15:00
8 oktas
WXSIM: 96.5%
18:00
6/8
Sky 77%
Fri 30 Oct 18:00
6 oktas
WXSIM: 77.1%
21:00
7/8
Sky 89%
Fri 30 Oct 21:00
7 oktas
WXSIM: 88.6%
Saturday 31 Oct
00:00
7/8
Sky 88%
Sat 31 Oct 00:00
7 oktas
WXSIM: 88.4%
03:00
4/8
Sky 46%
Sat 31 Oct 03:00
4 oktas
WXSIM: 45.5%
06:00
5/8
Sky 62%
Sat 31 Oct 06:00
5 oktas
WXSIM: 61.6%
09:00
4/8
Sky 49%
Sat 31 Oct 09:00
4 oktas
WXSIM: 48.5%
12:00
1/8
Sky 7%
Sat 31 Oct 12:00
1 oktas
WXSIM: 7.0%
15:00
4/8
Sky 54%
Sat 31 Oct 15:00
4 oktas
WXSIM: 53.5%
18:00
4/8
Sky 46%
Sat 31 Oct 18:00
4 oktas
WXSIM: 45.8%
21:00
6/8
Sky 69%
Sat 31 Oct 21:00
6 oktas
WXSIM: 69.1%
Sunday 1 Nov
00:00
5/8
Sky 62%
Sun 1 Nov 00:00
5 oktas
WXSIM: 61.5%
03:00
1/8
Sky 13%
Sun 1 Nov 03:00
1 oktas
WXSIM: 13.3%
06:00
0/8
Sky 5%
Sun 1 Nov 06:00
0 oktas
WXSIM: 5.3%
09:00
0/8
Sky 5%
Sun 1 Nov 09:00
0 oktas
WXSIM: 5.3%
12:00
1/8
Sky 7%
Sun 1 Nov 12:00
1 oktas
WXSIM: 7.4%
15:00
6/8
Sky 73%
Sun 1 Nov 15:00
6 oktas
WXSIM: 73.4%
18:00
8/8
Sky 99%
Sun 1 Nov 18:00
8 oktas
WXSIM: 99.4%
21:00
8/8
Sky 100%
Sun 1 Nov 21:00
8 oktas
WXSIM: 100.0%
Monday 2 Nov
00:00
8/8
Sky 100%
Mon 2 Nov 00:00
8 oktas
WXSIM: 100.0%
03:00
8/8
Sky 100%
Mon 2 Nov 03:00
8 oktas
WXSIM: 99.8%
06:00
8/8
Sky 100%
Mon 2 Nov 06:00
8 oktas
WXSIM: 100.0%
09:00
–
 
 
12:00
–
 
 
15:00
–
 
 
18:00
–
 
 
21:00
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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 26 Oct 09:49 (refreshed every 30 minutes).
DateDay 07:00–19:00Night 19:00–07:00
WXSIMWUDifferenceWXSIMWUDifference
Mon 26 Oct
8/8100%
8/894%
 0 oktas
8/895%
7/882%
 +1 okta
Tue 27 Oct
5/861%
6/880%
 -1 okta
7/883%
6/872%
 +1 okta
Wed 28 Oct
6/878%
4/851%
 +2 oktas
6/873%
6/873%
 0 oktas
Thu 29 Oct
8/899%
6/881%
 +2 oktas
8/896%
7/889%
 +1 okta
Fri 30 Oct
7/887%
7/883%
 0 oktas
5/867%
6/877%
 -1 okta
Sat 31 Oct
3/842%
7/886%
 -4 oktas
3/836%
5/861%
 -2 oktas
Sun 1 Nov
3/839%
 not in WU forecast —
8/8100%
 not in WU forecast —
Periods compared: 12
Same okta: 3 (25%)
Within 1 okta: 8 (67%)
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.