Slieve Gallion (County Londonderry) weather
Find a forecast
Forecast days
-
Maximum daytime temperature: 12° Celsius; Minimum nighttime temperature: 8° Celsius;
Maximum daytime temperature: 12 degrees Celsius; Minimum nighttime temperature: 8 degrees Celsius; -
Maximum daytime temperature: 11° Celsius; Minimum nighttime temperature: 9° Celsius;
Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius;
-
Maximum daytime temperature: 13° Celsius; Minimum nighttime temperature: 10° Celsius;
Maximum daytime temperature: 13 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius; -
Maximum daytime temperature: 13° Celsius; Minimum nighttime temperature: 9° Celsius;
Maximum daytime temperature: 13 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius; -
Maximum daytime temperature: 14° Celsius; Minimum nighttime temperature: 11° Celsius;
Maximum daytime temperature: 14 degrees Celsius; Minimum nighttime temperature: 11 degrees Celsius; -
Maximum daytime temperature: 16° Celsius; Minimum nighttime temperature: 10° Celsius;
Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius; -
Maximum daytime temperature: 13° Celsius; Minimum nighttime temperature: 9° Celsius;
Maximum daytime temperature: 13 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius;
Light showers changing to cloudy by late morning.
Sunrise:
Sunset:
M UV
L Pollution
No pollen data.
7 day forecast for Slieve Gallion
Today (16 September 2026)
| Time |
01:00
|
02:00
|
03:00
|
04:00
|
05:00
|
06:00
|
07:00
|
08:00
|
09:00
|
10:00
|
11:00
|
12:00
|
13:00
|
14:00
|
15:00
|
16:00
|
17:00
|
18:00
|
19:00
|
20:00
|
21:00
|
22:00
|
23:00
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |  |
|
|
|
|
|
 |
|
 |
 |
|
|
|
|
|
 |
 |
|
|
|
 |
|
|
| Chance of precipitation |
90%
|
80%
|
80%
|
70%
|
60%
|
60%
|
50%
|
40%
|
40%
|
40%
|
50%
|
30%
|
30%
|
20%
|
20%
|
70%
|
40%
|
40%
|
60%
|
70%
|
≥95%
|
≥95%
|
80%
|
| Temperature |
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
10°
|
10°
|
10°
|
11°
|
11°
|
11°
|
11°
|
11°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
| Feels like temperature (°C) |
6°
|
6°
|
6°
|
6°
|
6°
|
6°
|
6°
|
6°
|
7°
|
7°
|
8°
|
8°
|
8°
|
8°
|
8°
|
8°
|
7°
|
7°
|
7°
|
6°
|
6°
|
6°
|
7°
|
| Wind direction and speed |
WNW
15
|
WNW
15
|
WNW
14
|
WNW
15
|
WNW
14
|
WNW
14
|
WNW
14
|
W
14
|
W
13
|
W
14
|
W
13
|
W
14
|
WSW
15
|
WSW
15
|
WSW
16
|
SW
16
|
SW
16
|
SSW
18
|
SSW
18
|
SW
19
|
SW
18
|
SW
19
|
SW
18
|
| Wind gust (mph) |
20
|
19
|
19
|
18
|
18
|
17
|
17
|
18
|
19
|
20
|
20
|
21
|
23
|
24
|
23
|
23
|
24
|
26
|
27
|
28
|
29
|
29
|
28
|
| Visibility |
VP
|
P
|
P
|
P
|
P
|
P
|
P
|
P
|
P
|
M
|
M
|
G
|
G
|
G
|
VG
|
G
|
M
|
M
|
P
|
P
|
P
|
VP
|
VP
|
| Humidity |
95%
|
93%
|
93%
|
94%
|
94%
|
95%
|
95%
|
95%
|
92%
|
89%
|
85%
|
84%
|
80%
|
79%
|
75%
|
75%
|
79%
|
85%
|
88%
|
92%
|
95%
|
96%
|
98%
|
| UV | - | - | - | - | - | - | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | - | - | - | - |
Thursday (17 September 2026)
| Time |
00:00
|
01:00
|
02:00
|
03:00
|
04:00
|
05:00
|
06:00
|
07:00
|
08:00
|
09:00
|
10:00
|
11:00
|
12:00
|
13:00
|
14:00
|
15:00
|
16:00
|
17:00
|
18:00
|
19:00
|
20:00
|
21:00
|
22:00
|
23:00
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |  |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
| Chance of precipitation |
40%
|
30%
|
30%
|
40%
|
60%
|
60%
|
70%
|
80%
|
80%
|
80%
|
90%
|
90%
|
90%
|
90%
|
90%
|
70%
|
50%
|
40%
|
20%
|
10%
|
<5%
|
10%
|
10%
|
30%
|
| Temperature (°C) |
10°
|
10°
|
9°
|
8°
|
8°
|
8°
|
8°
|
8°
|
9°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
9°
|
9°
|
9°
|
9°
|
| Feels like temperature (°C) |
7°
|
6°
|
5°
|
5°
|
5°
|
5°
|
5°
|
5°
|
5°
|
6°
|
6°
|
7°
|
7°
|
7°
|
7°
|
7°
|
7°
|
7°
|
7°
|
6°
|
6°
|
6°
|
5°
|
5°
|
| Wind direction and speed (mph) |
W
18
|
W
16
|
W
15
|
W
15
|
WSW
15
|
WSW
16
|
WSW
16
|
WSW
16
|
WSW
18
|
WSW
18
|
WSW
18
|
W
19
|
W
19
|
W
19
|
W
19
|
W
19
|
W
18
|
W
19
|
W
18
|
W
17
|
W
15
|
WSW
15
|
WSW
15
|
WSW
15
|
| Wind gust (mph) |
25
|
22
|
21
|
20
|
22
|
22
|
24
|
25
|
27
|
29
|
32
|
34
|
35
|
34
|
34
|
35
|
33
|
31
|
29
|
26
|
23
|
21
|
20
|
20
|
| Visibility (description) |
VP
|
M
|
M
|
G
|
G
|
M
|
M
|
P
|
P
|
M
|
G
|
G
|
G
|
G
|
G
|
G
|
G
|
G
|
G
|
G
|
G
|
G
|
G
|
G
|
| Humidity |
96%
|
93%
|
92%
|
90%
|
88%
|
89%
|
91%
|
93%
|
91%
|
87%
|
84%
|
81%
|
80%
|
79%
|
78%
|
75%
|
73%
|
70%
|
72%
|
74%
|
77%
|
79%
|
83%
|
85%
|
| UV | - | - | - | - | - | - | - | 1 | 1 | 1 | 2 | 3 | 3 | 3 | 3 | 3 | 2 | 1 | 1 | 1 | - | - | - | - |
Friday (18 September 2026)
| Time |
00:00
|
01:00
|
02:00
|
03:00
|
04:00
|
05:00
|
06:00
|
07:00
|
08:00
|
09:00
|
10:00
|
11:00
|
12:00
|
13:00
|
14:00
|
15:00
|
16:00
|
17:00
|
18:00
|
19:00
|
20:00
|
21:00
|
22:00
|
23:00
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Chance of precipitation |
40%
|
40%
|
40%
|
20%
|
<5%
|
10%
|
10%
|
10%
|
40%
|
60%
|
80%
|
90%
|
90%
|
90%
|
90%
|
80%
|
60%
|
50%
|
50%
|
50%
|
50%
|
40%
|
40%
|
30%
|
| Temperature (°C) |
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
10°
|
10°
|
10°
|
10°
|
10°
|
12°
|
12°
|
12°
|
12°
|
12°
|
12°
|
11°
|
11°
|
11°
|
| Feels like temperature (°C) |
5°
|
5°
|
6°
|
6°
|
6°
|
6°
|
6°
|
5°
|
5°
|
6°
|
6°
|
6°
|
6°
|
7°
|
7°
|
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
8°
|
8°
|
| Wind direction and speed (mph) |
WSW
14
|
WSW
15
|
WSW
15
|
WSW
15
|
WSW
16
|
WSW
15
|
WSW
15
|
SW
15
|
SW
15
|
SSW
16
|
SSW
18
|
SSW
18
|
SSW
19
|
SSW
19
|
SSW
18
|
SW
18
|
SW
18
|
WSW
18
|
WSW
18
|
WSW
17
|
WSW
16
|
WSW
16
|
WSW
16
|
WSW
16
|
| Wind gust (mph) |
21
|
21
|
20
|
20
|
19
|
19
|
19
|
19
|
20
|
22
|
25
|
28
|
30
|
31
|
30
|
28
|
27
|
26
|
25
|
24
|
22
|
21
|
21
|
21
|
| Visibility (description) |
M
|
M
|
M
|
M
|
M
|
P
|
P
|
P
|
P
|
P
|
P
|
VP
|
VP
|
VP
|
VP
|
VP
|
VP
|
VP
|
P
|
P
|
VP
|
P
|
P
|
P
|
| Humidity |
87%
|
88%
|
89%
|
89%
|
90%
|
91%
|
93%
|
93%
|
93%
|
92%
|
92%
|
94%
|
96%
|
97%
|
97%
|
98%
|
97%
|
95%
|
92%
|
92%
|
94%
|
93%
|
93%
|
93%
|
| UV | - | - | - | - | - | - | - | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 2 | 1 | 1 | 1 | 1 | - | - | - | - |
Saturday (19 September 2026)
| Time |
00:00
|
01:00
|
02:00
|
03:00
|
04:00
|
05:00
|
06:00
|
07:00
|
08:00
|
09:00
|
10:00
|
11:00
|
12:00
|
13:00
|
14:00
|
15:00
|
16:00
|
17:00
|
18:00
|
19:00
|
20:00
|
21:00
|
22:00
|
23:00
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Chance of precipitation |
30%
|
20%
|
20%
|
20%
|
20%
|
20%
|
20%
|
30%
|
30%
|
40%
|
40%
|
40%
|
40%
|
40%
|
40%
|
30%
|
30%
|
40%
|
40%
|
30%
|
30%
|
30%
|
30%
|
30%
|
| Temperature (°C) |
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
11°
|
12°
|
12°
|
12°
|
12°
|
12°
|
12°
|
12°
|
12°
|
10°
|
10°
|
10°
|
10°
|
10°
|
| Feels like temperature (°C) |
7°
|
7°
|
7°
|
7°
|
6°
|
6°
|
6°
|
6°
|
7°
|
7°
|
7°
|
8°
|
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
8°
|
7°
|
7°
|
6°
|
6°
|
6°
|
| Wind direction and speed (mph) |
WSW
16
|
WSW
16
|
SW
16
|
WSW
16
|
WSW
17
|
WSW
17
|
SW
17
|
SW
16
|
SW
16
|
WSW
17
|
WSW
17
|
WSW
18
|
WSW
18
|
WSW
18
|
WSW
18
|
WSW
18
|
WSW
18
|
WSW
18
|
WSW
18
|
WSW
17
|
WSW
16
|
WSW
16
|
WSW
16
|
WSW
16
|
| Wind gust (mph) |
21
|
21
|
22
|
22
|
22
|
23
|
22
|
21
|
23
|
25
|
27
|
30
|
30
|
31
|
30
|
29
|
26
|
26
|
24
|
22
|
20
|
20
|
19
|
18
|
| Visibility (description) |
M
|
P
|
P
|
P
|
P
|
P
|
P
|
P
|
P
|
P
|
M
|
M
|
G
|
M
|
M
|
M
|
M
|
M
|
M
|
G
|
M
|
M
|
M
|
M
|
| Humidity |
92%
|
93%
|
93%
|
93%
|
93%
|
93%
|
93%
|
93%
|
93%
|
91%
|
86%
|
84%
|
80%
|
73%
|
73%
|
71%
|
70%
|
71%
|
74%
|
78%
|
85%
|
86%
|
86%
|
87%
|
| UV | - | - | - | - | - | - | - | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | - | - | - | - |
Sunday (20 September 2026)
| Time |
00:00
|
01:00
|
02:00
|
03:00
|
04:00
|
05:00
|
06:00
|
07:00
|
08:00
|
09:00
|
10:00
|
11:00
|
12:00
|
13:00
|
14:00
|
15:00
|
16:00
|
17:00
|
18:00
|
19:00
|
20:00
|
21:00
|
22:00
|
23:00
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Chance of precipitation |
30%
|
30%
|
30%
|
20%
|
30%
|
40%
|
40%
|
40%
|
40%
|
40%
|
30%
|
30%
|
30%
|
30%
|
20%
|
20%
|
20%
|
20%
|
20%
|
20%
|
20%
|
20%
|
20%
|
20%
|
| Temperature (°C) |
10°
|
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
9°
|
10°
|
10°
|
11°
|
11°
|
12°
|
12°
|
13°
|
13°
|
13°
|
13°
|
12°
|
12°
|
12°
|
12°
|
11°
|
11°
|
| Feels like temperature (°C) |
6°
|
6°
|
6°
|
6°
|
6°
|
6°
|
7°
|
7°
|
7°
|
7°
|
8°
|
8°
|
9°
|
10°
|
10°
|
10°
|
10°
|
10°
|
10°
|
9°
|
9°
|
10°
|
9°
|
9°
|
| Wind direction and speed (mph) |
WSW
16
|
WSW
16
|
WSW
16
|
WSW
13
|
WSW
13
|
WSW
13
|
WSW
11
|
WSW
11
|
WSW
11
|
WSW
13
|
WSW
14
|
WSW
15
|
WSW
16
|
WSW
15
|
WSW
15
|
WSW
16
|
WSW
13
|
WSW
13
|
SW
11
|
SW
12
|
SSW
11
|
SSW
11
|
SSW
11
|
SSW
11
|
| Wind gust (mph) |
17
|
17
|
16
|
15
|
15
|
15
|
15
|
14
|
15
|
17
|
20
|
21
|
21
|
21
|
20
|
19
|
20
|
20
|
16
|
13
|
13
|
16
|
18
|
18
|
| Visibility (description) |
M
|
M
|
M
|
M
|
M
|
M
|
M
|
P
|
P
|
P
|
P
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
P
|
P
|
P
|
P
|
| Humidity |
89%
|
91%
|
91%
|
91%
|
91%
|
91%
|
91%
|
90%
|
89%
|
86%
|
79%
|
76%
|
68%
|
65%
|
64%
|
64%
|
67%
|
70%
|
75%
|
82%
|
84%
|
87%
|
90%
|
91%
|
| UV | - | - | - | - | - | - | - | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 2 | 1 | 1 | 1 | 1 | - | - | - | - |
Monday (21 September 2026)
| Time |
00:00
|
01:00
|
04:00
|
07:00
|
10:00
|
13:00
|
16:00
|
19:00
|
22:00
|
|---|---|---|---|---|---|---|---|---|---|
| Weather symbols | |
|
|
|
|
|
|
|
|
| Chance of precipitation | – |
30%
|
30%
|
20%
|
20%
|
20%
|
20%
|
30%
|
30%
|
| Temperature (°C) |
11°
|
12°
|
12°
|
12°
|
13°
|
14°
|
15°
|
14°
|
12°
|
| Feels like temperature (°C) |
9°
|
9°
|
9°
|
9°
|
10°
|
11°
|
12°
|
11°
|
10°
|
| Wind direction and speed (mph) |
SSW
11
|
SSW
11
|
SW
14
|
SW
14
|
SW
16
|
SW
18
|
SW
18
|
SW
15
|
SW
15
|
| Wind gust (mph) |
18
|
20
|
21
|
23
|
26
|
26
|
24
|
21
|
22
|
| Visibility (description) |
P
|
P
|
P
|
P
|
P
|
M
|
G
|
M
|
P
|
| Humidity |
91%
|
92%
|
93%
|
94%
|
92%
|
86%
|
82%
|
87%
|
91%
|
| UV | - | - | - | 1 | 1 | 2 | 1 | 1 | - |
Tuesday (22 September 2026)
| Time |
01:00
|
04:00
|
07:00
|
10:00
|
13:00
|
16:00
|
19:00
|
22:00
|
|---|---|---|---|---|---|---|---|---|
| Weather symbols | |
|
|
|
|
|
|
|
| Chance of precipitation |
40%
|
40%
|
30%
|
30%
|
30%
|
30%
|
20%
|
20%
|
| Temperature (°C) |
12°
|
11°
|
10°
|
11°
|
12°
|
12°
|
10°
|
9°
|
| Feels like temperature (°C) |
9°
|
8°
|
7°
|
9°
|
9°
|
9°
|
7°
|
6°
|
| Wind direction and speed (mph) |
SW
14
|
SW
13
|
SW
13
|
SW
13
|
WSW
16
|
W
16
|
W
14
|
W
11
|
| Wind gust (mph) |
20
|
17
|
18
|
23
|
23
|
20
|
14
|
13
|
| Visibility (description) |
P
|
P
|
P
|
P
|
M
|
M
|
M
|
P
|
| Humidity |
92%
|
92%
|
93%
|
87%
|
76%
|
71%
|
78%
|
86%
|
| UV | - | - | 1 | 1 | 2 | 1 | 1 | - |
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Northern Ireland weather forecast
Headline:
Occasional showers overnight, a brighter day on Wednesday, rain later.
This Evening and Tonight:
Clear spells and scattered showers in the evening, a few of these heavy at first. Clear spells and showers overnight, staying driest in the southeast. Minimum temperature 11 °C.
Wednesday:
Bright spells and a few showers in the morning, these mainly over Antrim. Cloud spilling east in the afternoon before occasionally heavy rain pushes east in the evening. Maximum temperature 17 °C.
Outlook for Thursday to Saturday:
Bright spells and scattered blustery showers on Thursday. Showers easing early Friday, becoming dry and bright before rain spreads east later. Bright spells and scattered showers on Saturday.
Updated: