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 — and sunset is at 04:20 PM.

Days 1–4 Weather Summary

Mostly dry. Icy conditions (max 6°C on Sun afternoon, min -5°C on Mon night). Mainly fresh winds.

Days 5–7 Weather Summary

Mostly dry. Air temperatures will be below freezing (max -1°C on Fri morning, min -6°C on Wed night). Wind will be generally light.

Days 8–10 Weather Summary

Moderate rain (total 10mm) heaviest on Fri night, then becoming colder with a dusting of snow on Sat night. Freeze-thaw conditions (max 8°C on Fri night, min -9°C on Sun night). Winds decreasing (strong winds from the SE on Fri night, light winds from the WSW by Sun night).

Days 11–13 Weather Summary

A dusting of new snow. Temperatures will be below freezing (max 0°C on Tue night, min -6°C on Mon night). Wind will be generally light.

Sat
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
Thu
1
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
AM
Wave Height Map
High Tide
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
9:35AM0.41m
9:33PM0.45m
10:33AM0.40m
Low Tide
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
2:03PM0.35m
5:28AM0.30m
Wave
height (m) 
direction
period (s) 
cloud
part cloud
cloud
cloud
part cloud
part cloud
cloud
cloud
cloud
cloud
part cloud
clear
part cloud
clear
clear
cloud
part cloud
clear
part cloud
mod rain
cloud
cloud
light snow
part cloud
cloud
part cloud
part cloud
cloud
part cloud
cloud
cloud
light snow
part cloud
part cloud
clear
part cloud
cloudy
some clouds
cloudy
cloudy
some clouds
some clouds
cloudy
cloudy
cloudy
cloudy
some clouds
clear
some clouds
clear
clear
cloudy
some clouds
clear
some clouds
mod rain
cloudy
cloudy
light snow
some clouds
cloudy
some clouds
some clouds
cloudy
some clouds
cloudy
cloudy
light snow
some clouds
some clouds
clear
some clouds
 km/h
30
WNW
10
SSW
30
SSW
25
SSW
25
W
20
WNW
25
NNW
20
NNW
20
NW
20
NW
5
N
15
NNE
10
NNE
10
NNW
10
NW
10
W
10
WNW
10
S
20
SSE
35
SSE
35
WNW
35
WNW
30
W
30
W
25
W
15
WSW
20
WSW
15
WNW
0
SW
10
ESE
20
ESE
15
E
15
ENE
15
NNE
5
NNW
10
NW
 mm 
10
max°C
-1
-1
4
6
6
0
0
-4
-4
-4
-5
-4
-3
-5
-5
-2
-2
-1
1
8
3
-4
-6
-7
-7
-6
-6
-4
-4
-4
-2
0
0
-1
-3
-3
Moonrise
9:19
9:52
10:19
10:41
11:01
11:18
11:36
11:55
12:17
12:45
1:22
2:13
Moonset
4:28
5:32
6:41
7:52
9:04
10:15
11:28
12:42
2:00
3:22
4:47
6:09
Sunrise
7:41
7:41
7:41
7:41
7:41
7:43
7:43
7:43
7:43
7:43
7:43
7:43
Sunset
4:20
4:21
4:21
4:22
4:22
4:22
4:23
4:23
4:24
4:25
4:27
4:28
Today's sea temperature in Johnstown is
4.9° C
(Statistics for 20 Dec 1981-2005 – mean: 2.5 max: 4.3 min: 0.7°C)
Issued (local time): 1 pm Saturday 20 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest locationNearest