South Island Rainfall Forecast

Today 21 Aug
40%< 1mm
Fri 22 Aug
65%1–5mm
Sat 23 Aug
95%15–30mm
Sun 24 Aug
60%1–5mm
Mon 25 Aug
10%< 1mm
Tue 26 Aug
5%< 1mm
Wed 27 Aug
5%< 1mm

South Island Rainfall Statistics View More

August Rainfall

Onslow Airport (31km)

Total Rainfall 2025
245.4mm
Daily Average 2025
1.1mm
Wettest Day 20 January, 2025
78mm
Wet Days 2025
39/233 (17%)
Total Rainfall July
1mm
Daily Average July
0mm
Wettest Day 7 July, 2025
0.4mm
Wet Days July
3/31 (10%)
Total Rainfall August
1.8mm
Daily Average August
0.1mm
Wettest Day 3 August, 2025
1mm
Wet Days August
5/21 (24%)

Climate (2010–Present)

Onslow Airport (31km)

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Annual Average 2020–2024
209.9mm
Monthly Average 2020–2025
20.4mm
Daily Average 2020–2025
0.7mm
Wettest Day 18 May, 2022
87.6mm

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