Johnstown Sea Conditions and Tide Table

Johnstown Sea Conditions table showing wave height, swell direction and period.

High and low tide times are also provided on the table along with the moon phase and forecast weather. Sunrise today is at 07:39 AM and sunset is at 04:20 PM.

Days 1–3 Weather Summary

Moderate rain (total 11mm), heaviest on Fri night. Icy conditions (max 12°C on Fri night, min -3°C on Sun night). Winds decreasing (near gales from the S on Fri night, light winds from the WSW by Sat night).

Days 4–6 Weather Summary

A moderate fall of snow, heaviest on Wed afternoon. Air temperatures will be below freezing (max 0°C on Mon morning, min -5°C on Tue afternoon). Winds increasing (light winds from the SSW on Tue night, fresh winds from the NE by Wed morning).

Days 7–9 Weather Summary

A dusting of new snow. Freeze-thaw conditions (max 2°C on Sat morning, min -7°C on Thu night). Wind will be generally light.

Days 10–12 Weather Summary

A dusting of new snow. Temperatures will be below freezing (max -4°C on Sun morning, min -11°C on Mon morning). Wind will be generally light.

Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
Wave Height Map
High Tide
1:42PM0.37m
00:06AM0.41m
2:15PM0.37m
1:01AM0.42m
9:27AM0.36m
2:32PM0.36m
1:56AM0.43m
2:35PM0.36m
2:38AM0.43m
2:44PM0.36m
3:15AM0.44m
3:11PM0.36m
3:51AM0.44m
3:47PM0.38m
4:30AM0.44m
4:30PM0.39m
5:15AM0.44m
5:26PM0.41m
6:14AM0.43m
6:46PM0.42m
7:23AM0.42m
7:53PM0.44m
8:31AM0.42m
8:45PM0.45m
Low Tide
6:23AM0.33m
5:55PM0.33m
6:58AM0.34m
6:21PM0.33m
7:42AM0.36m
11:57AM0.36m
6:46PM0.32m
12:26PM0.35m
7:12PM0.32m
12:08PM0.35m
7:41PM0.32m
11:26AM0.35m
8:22PM0.33m
11:05AM0.34m
9:56PM0.34m
11:07AM0.33m
11:26PM0.34m
11:22AM0.33m
00:27AM0.35m
11:46AM0.33m
1:30AM0.35m
12:16PM0.34m
2:56AM0.34m
12:58PM0.35m
4:27AM0.32m
Wave
height (m) 
direction
period (s) 
part cloud
cloud
heavy rain
part cloud
cloud
part cloud
cloud
cloud
part cloud
part cloud
part cloud
cloud
cloud
cloud
light snow
light snow
light snow
part cloud
part cloud
part cloud
part cloud
cloud
light snow
light snow
cloud
cloud
part cloud
cloud
cloud
cloud
cloud
light snow
cloud
part cloud
cloud
part cloud
some clouds
cloudy
heavy rain
some clouds
cloudy
some clouds
cloudy
cloudy
some clouds
some clouds
some clouds
cloudy
cloudy
cloudy
light snow
light snow
light snow
some clouds
some clouds
some clouds
some clouds
cloudy
light snow
light snow
cloudy
cloudy
some clouds
cloudy
cloudy
cloudy
cloudy
light snow
cloudy
some clouds
cloudy
some clouds
 km/h
25
S
35
S
50
S
30
WSW
35
WNW
10
WSW
30
SSW
25
SSW
25
W
25
NW
25
NW
25
NNW
20
NW
10
W
15
SE
35
NE
30
NNE
20
NW
20
NW
15
WNW
5
WSW
10
SSE
15
E
0
E
25
WNW
25
WNW
15
W
20
WNW
25
WNW
25
W
20
WSW
15
W
20
W
20
WSW
25
W
20
NW
 mm 
11
max°C
8
10
12
5
-1
-1
5
6
6
0
-1
-4
-3
-4
-1
0
0
-1
-2
-2
-4
-4
-3
1
2
-3
-4
-4
-5
-6
-11
-9
-5
-7
-6
-5
Moonrise
7:44
8:36
9:19
9:52
10:19
10:41
11:01
11:18
11:36
11:55
12:17
12:45
Moonset
3:32
4:28
5:32
6:41
7:52
9:04
10:15
11:28
12:42
2:00
3:22
Sunrise
7:39
7:39
7:41
7:41
7:41
7:41
7:41
7:43
7:43
7:43
7:43
7:43
Sunset
4:20
4:20
4:21
4:21
4:22
4:22
4:22
4:23
4:23
4:24
4:25
4:27
Today's sea temperature in Johnstown is
4.8° C
(Statistics for 19 Dec 1981-2005 – mean: 2.5 max: 4.9 min: 0.7°C)
Issued (local time): 7 am Friday 19 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest locationNearest