Clear Outside v1.0 - International Weather Forecasts For Astronomers

Monday 31

Waning Gibbous 91%

21:12

10:52

02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad

Sun - Rise: 06:52, Set: 20:31, Transit: 13:42. Moon - Rise: 21:12, Set: 10:52. Civil Dark: 21:07 - 06:17. Nautical Dark: 21:50 - 05:33. Astro Dark: 22:39 - 04:44

Total Clouds (% Sky Obscured)

93
97
98
98
71
93
99
100
83
79
76
100
100
95
66
62
40
39
44
39
55
52
71
86

Low Clouds (% Sky Obscured)

65
77
77
87
49
79
81
83
49
51
50
85
84
71
37
35
32
32
26
30
41
46
44
45

Medium Clouds (% Sky Obscured)

93
97
81
16
17
17
15
12
26
13
12
20
17
21
9
10
7
10
13
12
16
10
8
0

High Clouds (% Sky Obscured)

93
97
98
89
71
67
67
62
76
57
61
71
62
70
66
62
9
0
0
0
2
3
18
39

ISS Passover

Visibility (miles)

6
2
2
3
6
5
3
3
3
5
8
5
5
5
7
5
9
7
9
9
7
7
8
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

Light Rain
Light Rain
Light Rain
Light Rain
Very Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Very Light Rain
Light Rain
None
None
None
Very Light Rain
Very Light Rain
None

Precipitation Probability (%)

86
95
95
83
71
95
95
95
95
95
85
77
85
95
82
80
64
56
34
37
49
54
51
31

Precipitation Amount (mm)

0.8
1.8
0.8
0.5
0.2
0.7
1.1
1.7
2.1
0.8
0.5
0.4
0.5
0.9
0.4
0.5
0.3
0.4
0
0
0
0.2
0.2
0

Wind Speed/Direction (mph)

9
9
10
12
11
12
14
16
17
17
15
16
15
15
16
14
13
13
11
9
9
10
9
7

Chance of Frost

Temperature (°C)

17
17
17
16
16
16
16
17
17
17
17
17
18
18
18
18
18
18
18
17
17
17
17
16

Feels Like (°C)

18
16
16
16
14
15
14
14
14
13
14
14
15
15
16
17
18
17
18
17
17
17
16
15

Dew Point (°C)

16
16
16
15
15
15
15
15
15
14
14
14
15
15
13
13
13
14
14
14
14
13
13
14

Relative Humidity (%)

89
92
92
93
90
93
90
87
86
83
85
78
82
82
74
73
72
75
77
81
82
81
81
83

Pressure (mb)

1008
1008
1007
1007
1007
1007
1007
1007
1007
1008
1008
1008
1009
1010
1011
1011
1012
1012
1013
1014
1014
1015
1016
1016

Ozone (du)

328
323
327
329
331
332
333
335
337
337
337
339
338
336
334
332
332
329
326
323
321
319
319
317

Tuesday 1

Waning Gibbous 83%

21:28

12:16

02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 OK
13 Bad
14 OK
15 OK
16 OK
17 OK
18 Bad
19 OK
20 Good
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad

Sun - Rise: 06:54, Set: 20:29, Transit: 13:41. Moon - Rise: 21:28, Set: 12:16. Civil Dark: 21:04 - 06:19. Nautical Dark: 21:48 - 05:35. Astro Dark: 22:36 - 04:47

Total Clouds (% Sky Obscured)

100
100
95
95
94
70
76
69
62
70
48
55
26
22
34
42
50
23
1
91
100
88
69
100

Low Clouds (% Sky Obscured)

33
33
49
46
33
36
31
33
32
28
28
34
16
12
20
22
23
20
0
0
0
0
0
16

Medium Clouds (% Sky Obscured)

8
30
71
46
58
18
28
57
31
10
7
6
1
0
0
0
4
1
0
4
4
19
25
25

High Clouds (% Sky Obscured)

100
99
49
42
39
42
7
3
2
2
2
3
9
7
10
11
15
0
1
91
100
88
69
100

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

2
1
1
2
2
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
4
11

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

7
7
8
7
7
7
7
8
10
10
10
10
10
10
9
9
8
7
5
3
4
4
5
5

Chance of Frost

Temperature (°C)

16
16
16
16
15
15
15
16
17
18
19
20
20
20
20
20
19
19
18
17
16
15
15
15

Feels Like (°C)

15
15
14
14
14
13
14
15
15
16
17
18
18
19
19
18
17
17
18
18
15
14
14
15

Dew Point (°C)

14
13
13
12
12
11
11
11
10
10
9
10
10
10
10
10
10
11
11
11
11
10
10
11

Relative Humidity (%)

83
82
81
80
80
79
75
68
62
58
53
52
53
52
53
53
55
58
64
71
72
72
73
75

Pressure (mb)

1016
1016
1017
1017
1017
1018
1018
1019
1020
1020
1020
1021
1021
1021
1021
1021
1021
1021
1021
1021
1021
1021
1021
1021

Ozone (du)

315
316
317
317
316
316
314
313
312
311
310
311
313
313
314
315
317
318
316
314
315
317
315
314

Wednesday 2

Waning Gibbous 74%

21:50

13:43

02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad

Sun - Rise: 06:56, Set: 20:27, Transit: 13:41. Moon - Rise: 21:50, Set: 13:43. Civil Dark: 21:02 - 06:20. Nautical Dark: 21:45 - 05:37. Astro Dark: 22:33 - 04:49

Total Clouds (% Sky Obscured)

100
100
100
100
100
100
94
100
99
88
85
82
79
84
96
95
90
100
96
94
94
96
97
86

Low Clouds (% Sky Obscured)

20
32
29
55
33
34
34
29
32
47
50
44
32
44
76
44
47
82
82
71
60
57
55
54

Medium Clouds (% Sky Obscured)

28
99
99
100
100
99
82
91
99
60
19
68
79
84
95
73
78
86
85
88
23
20
16
12

High Clouds (% Sky Obscured)

100
100
100
100
100
86
27
98
91
37
30
25
25
25
14
58
8
5
1
2
25
50
76
78

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
8
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

15
24
31
17
26
25
28
26
22
23
34
21
4
2
4
4
21
19
13
14
18
22
21
14

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

5
6
7
7
7
7
7
7
8
10
12
12
12
12
12
11
12
9
8
8
9
11
10
10

Chance of Frost

Temperature (°C)

15
15
15
15
15
15
16
17
18
18
19
18
19
20
20
20
20
19
18
18
18
18
18
18

Feels Like (°C)

14
14
13
14
14
14
14
15
16
16
16
15
16
18
18
18
18
18
17
18
18
17
16
16

Dew Point (°C)

11
11
11
12
12
13
13
13
12
10
9
8
10
11
13
13
12
12
13
13
15
15
15
15

Relative Humidity (%)

76
78
78
79
80
86
83
78
66
56
53
52
55
56
62
63
58
63
70
72
80
81
81
82

Pressure (mb)

1020
1020
1019
1019
1019
1019
1020
1020
1020
1020
1021
1021
1021
1021
1020
1020
1020
1020
1020
1020
1020
1019
1019
1019

Ozone (du)

314
315
317
318
319
320
316
312
310
309
309
309
306
304
302
301
301
301
302
301
300
299
298
297

Thursday 3

Waning Gibbous 63%

22:21

15:11

02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad

Sun - Rise: 06:57, Set: 20:24, Transit: 13:41. Moon - Rise: 22:21, Set: 15:11. Civil Dark: 20:59 - 06:22. Nautical Dark: 21:42 - 05:39. Astro Dark: 22:30 - 04:52

Total Clouds (% Sky Obscured)

97
94
96
96
97
97
98
99
100
99
98
97
98
99
100
92
99
100
100
99
96
97
84
58

Low Clouds (% Sky Obscured)

52
59
58
61
89
92
87
84
81
75
71
49
47
53
70
84
61
61
53
55
44
45
43
45

Medium Clouds (% Sky Obscured)

12
8
8
13
9
9
18
24
92
96
18
24
29
32
30
55
67
33
94
21
14
15
17
11

High Clouds (% Sky Obscured)

83
61
53
52
57
59
60
66
71
68
63
66
77
87
100
74
93
91
90
90
88
76
46
12

ISS Passover

Visibility (miles)

9
9
9
9
8
8
9
8
9
7
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
Very Light Rain
None
None
None
None
Very Light Rain
None
None
Very Light Rain
Very Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Very Light Rain
Light Rain
Very Light Rain
None
None
None

Precipitation Probability (%)

32
29
31
42
48
38
37
40
49
49
42
36
50
56
69
71
73
74
67
71
62
52
32
17

Precipitation Amount (mm)

0
0
0
0
0.3
0
0
0
0
0.2
0
0
0.2
0.3
0.4
0.4
0.4
0.5
0.3
0.4
0.3
0
0
0

Wind Speed/Direction (mph)

10
10
10
10
10
10
10
10
12
13
13
12
13
14
13
11
11
11
11
11
11
12
12
12

Chance of Frost

Temperature (°C)

17
17
17
18
18
18
18
19
20
20
20
20
21
21
21
20
21
20
20
20
20
20
20
20

Feels Like (°C)

17
16
16
16
16
17
17
18
18
19
19
19
19
19
18
18
19
19
20
19
19
19
19
19

Dew Point (°C)

14
15
15
15
16
17
17
17
18
19
19
19
18
16
13
13
14
16
17
18
18
18
18
18

Relative Humidity (%)

82
86
86
86
88
90
90
89
86
91
91
91
85
71
61
62
65
75
81
86
89
89
89
89

Pressure (mb)

1019
1018
1018
1018
1017
1017
1017
1017
1018
1018
1018
1018
1018
1018
1017
1017
1017
1016
1016
1016
1016
1016
1015
1015

Ozone (du)

296
295
294
293
291
291
293
293
291
289
289
290
290
289
289
288
288
287
287
286
285
285
286
287

Friday 4

Third Quarter 51%

23:08

16:31

02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad

Sun - Rise: 06:59, Set: 20:22, Transit: 13:40. Moon - Rise: 23:08, Set: 16:31. Civil Dark: 20:57 - 06:24. Nautical Dark: 21:40 - 05:41. Astro Dark: 22:27 - 04:54

Total Clouds (% Sky Obscured)

67
68
81
92
94
92
100
100
100
100
100
97
98
98
99
99
100
100
99
99
98
86
76
68

Low Clouds (% Sky Obscured)

44
48
61
56
54
64
72
73
67
55
52
88
77
67
57
50
40
31
32
31
35
36
32
27

Medium Clouds (% Sky Obscured)

8
11
12
64
77
64
96
98
98
99
99
46
64
81
99
99
100
100
99
99
98
67
37
8

High Clouds (% Sky Obscured)

35
52
74
76
85
86
85
90
90
90
94
97
82
64
44
61
81
97
92
95
97
78
56
33

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
8
5
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
Light Rain
Light Rain
Light Rain
Very Light Rain
Very Light Rain
Very Light Rain
Very Light Rain
Light Rain
Very Light Rain
None
None
None
None
None

Precipitation Probability (%)

12
9
8
11
14
16
29
38
43
55
91
81
88
68
56
60
68
78
67
52
23
19
14
3

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0.4
0.5
0.6
0.3
0.2
0.2
0.3
0.4
0.3
0
0
0
0
0

Wind Speed/Direction (mph)

12
11
12
12
13
14
15
16
17
16
17
16
16
15
13
12
11
11
11
8
7
8
9
9

Chance of Frost

Temperature (°C)

20
19
19
19
20
20
20
20
21
21
21
21
21
21
21
21
20
20
20
19
19
19
18
18

Feels Like (°C)

20
20
19
18
18
18
18
18
18
18
19
18
18
18
19
19
19
18
18
18
18
18
17
18

Dew Point (°C)

18
18
18
18
18
18
18
17
17
18
16
18
18
17
16
15
14
14
13
12
12
11
11
11

Relative Humidity (%)

91
93
91
91
89
88
88
82
79
81
72
82
80
77
74
70
68
68
66
63
61
59
62
64

Pressure (mb)

1015
1014
1014
1013
1013
1012
1012
1012
1012
1012
1012
1012
1012
1012
1012
1012
1012
1012
1012
1012
1013
1013
1013
1014

Ozone (du)

286
285
284
284
284
284
284
284
285
286
287
288
289
291
293
294
296
298
300
305
310
315
318
321

Saturday 5

Waning Crescent 39%

00:14

17:36

02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad
19 Bad
20 Bad
21 Bad
22 OK
23 OK
00 Bad
01 Bad

Sun - Rise: 07:00, Set: 20:20, Transit: 13:40. Moon - Rise: 00:14, Set: 17:36. Civil Dark: 20:55 - 06:26. Nautical Dark: 21:37 - 05:43. Astro Dark: 22:24 - 04:56

Total Clouds (% Sky Obscured)

65
57
54
64
73
82
80
80
79
82
84
87
77
67
58
59
62
64
56
45
35
43
54
63

Low Clouds (% Sky Obscured)

24
23
21
34
50
68
68
68
69
76
82
87
77
67
57
56
56
55
48
40
33
34
32
31

Medium Clouds (% Sky Obscured)

8
8
8
4
4
4
4
7
7
4
2
0
0
0
0
0
0
0
4
8
13
15
17
18

High Clouds (% Sky Obscured)

22
11
0
8
22
15
20
17
9
6
4
0
0
0
0
2
5
9
12
17
19
29
37
46

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

12
16
17
23
29
34
25
20
18
20
22
25
28
31
31
28
25
21
16
12
1
5
10
10

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

10
10
11
11
11
11
11
11
12
13
13
13
13
13
13
13
12
11
10
8
7
5
4
4

Chance of Frost

Temperature (°C)

17
17
17
16
16
16
16
17
17
17
18
18
18
18
18
18
18
17
17
16
15
14
14
14

Feels Like (°C)

17
16
15
15
16
15
15
14
14
14
14
14
15
14
13
14
14
14
14
13
13
13
13
13

Dew Point (°C)

11
11
11
11
11
10
10
10
10
10
10
11
11
11
11
11
10
9
8
8
8
8
9
9

Relative Humidity (%)

66
67
69
72
71
68
67
65
62
61
62
63
64
63
62
61
60
58
56
60
63
67
69
70

Pressure (mb)

1014
1014
1014
1015
1015
1016
1016
1017
1018
1019
1020
1020
1021
1022
1022
1023
1023
1024
1024
1025
1025
1026
1026
1026

Ozone (du)

324
329
334
338
341
344
347
346
344
343
339
336
333
332
332
331
330
329
327
325
323
321
320
319

Sunday 6

Waning Crescent 28%

01:36

18:23

Sun - Rise: 07:02, Set: 20:17, Transit: 13:40. Moon - Rise: 01:36, Set: 18:23. Civil Dark: 20:52 - 06:27. Nautical Dark: 21:34 - 05:45. Astro Dark: 22:21 - 04:59

Total Clouds (% Sky Obscured)

Low Clouds (% Sky Obscured)

Medium Clouds (% Sky Obscured)

High Clouds (% Sky Obscured)

ISS Passover

Visibility (miles)

Fog (%)

Precipitation Type

Precipitation Probability (%)

Precipitation Amount (mm)

Wind Speed/Direction (mph)

Chance of Frost

Temperature (°C)

Feels Like (°C)

Dew Point (°C)

Relative Humidity (%)

Pressure (mb)

Ozone (du)

Forecast for Leiden, Gemeente Leiden, Netherlands (52.16,4.50)

Generated: 31/08/26 02:44:30. Forecast: 31/08/26 to 06/09/26. Timezone: UTC+2.00