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Annual average temperature for 2025 was 16.61°c which was 0.15°c above the 2018/24 average. The current linear trend is slightly downward.
Updated 1st January 2026
Temp data
Monthly temperature °C data 2018 to present
Hauraki Gulf (Devonport)
2018-25
Ave
21.2
21.3
19.5
17.4
14.9
12.9
12.0
12.1
13.6
15.4
17.7
19.8
16.48
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Annual
2018
22.4
2019
21.7
2020
20.3
2021
20.7
2022
22.0
2023
20.5
2024
21.8
2025
19.9
2026
20.4
21.5
20.4
17.5
21.6
20.5
16.2
21.7
19.1
16.8
21.0
19.5
17.2
22.4
20.8
18.2
20.1
18.4
17.9
20.8
17.9
16.9
21.4
19.1
18.4
*
*
*
14.7
11.8
15.4
12.1
14.6
13.5
14.8
13.5
15.4
13.3
15.6
12.4
13.2
13.5
15.1
13.2
*
*
11.5
12.2
13.5
12.1
12.2
13.5
11.9
12.5
13.4
11.5
12.3
13.3
13.0
12.9
13.6
12.3
10.7
14.0
11.7
12.3
13.7
12.3
11.4
13.9
*
*
*
14.9
17.0
14.8
17.7
16.1
17.6
15.6
18.8
15.3
17.6
15.4
16.8
15.1
17.1
15.9
18.9
*
*
19.6
16.42
19.5
16.44
19.3
16.40
21.1
16.61
19.9
17.03
19.7
16.15
19.8
16.15
19.8
16.61
*
20.40
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