South Island Climate and Average Weather
Climate of South Island: average temperatures, rainfall and seasons month by month.
Climate in South Island month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 64° | 47° | 4,5 in | ★★★★☆ |
| February | 66° | 48° | 2,2 in | ★★★★☆ |
| March | 62° | 45° | 2,8 in | ★★★★☆ |
| April | 55° | 41° | 6,2 in | ★★★☆☆ |
| May | 49° | 35° | 3,8 in | ★★★☆☆ |
| June | 42° | 32° | 5,1 in | ★★☆☆☆ |
| July | 40° | 29° | 5,2 in | ★★☆☆☆ |
| August | 44° | 29° | 2,3 in | ★★☆☆☆ |
| September | 49° | 33° | 9,0 in | ★☆☆☆☆ |
| October | 52° | 36° | 10,0 in | ★★☆☆☆ |
| November | 60° | 42° | 3,6 in | ★★★☆☆ |
| December | 63° | 46° | 5,0 in | ★★★★☆ |
Climate type: Subarctic. Source: Open-Meteo archive (ERA5).
Recent extremes in South Island
Highest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How South Island compares with nearby places
Annual averages, and the difference against South Island.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Aoraki / Mount Cook | 31 mi | 12°F | 66°F cooler | 193 in |
| Wanaka | 85 mi | 52°F | +38°F warmer | 60 in |
| West Coast | 110 mi | 54°F | +40°F warmer | 117 in |
| Canterbury | 111 mi | 54°F | +40°F warmer | 27 in |
| Christchurch | 111 mi | 54°F | +40°F warmer | 27 in |
Best time to visit South Island
Go in February. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: July, September and October - expect the least comfortable mix of heat, cold or rain.
What this means for South Island
Today is slightly warmer than average for August. The forecast high of 51°F is 6.8°F above the 44°F typical for this month.
A 70% chance means rain is expected over most of the area. Plan indoor alternatives.
Visibility is down to 0,2 mi - use low beams and leave extra following distance. Gusts to 38 mph will push high-sided vehicles on exposed roads and bridges. Wet roads are likely; braking distances roughly double in heavy rain.
Southern Hemisphere, so peak summer falls in December to February.
The gap between the warmest and coldest month averages 54°F.
What to pack, what to skip
- A warm mid-layer and gloves for early mornings and evenings
- A packable rain shell - 6 of the next 7 days carry a real chance of rain
- Avoid exposed ridgelines, small boats and rooftop viewpoints while gusts stay above 38 mph.
- If your dates are flexible, avoid July, September and October - historically the least comfortable months here.
Summary
South Island is an island in New Zealand. South Island is an island known for Southern Alps, fiords and glaciers.
Right now it is 47°F (9°C) in South Island with partly cloudy. It feels like 35°F. Today runs from 39°F to 51°F. Chance of precipitation is 70%. Sightseeing conditions score 3.6/10 - poor - consider another day.
The best time to visit South Island is February. The climate is subarctic. July, September and October tend to be the least comfortable months. February is the warmest month with average highs near 66°F, while August is the coldest with lows near 29°F.
The closest major airport is Queenstown Airport (ZQN), about 114 mi away. Nearby highlights include Aoraki / Mount Cook, Lake Wakatipu, Te Wahipounamu - South West New Zealand and Milford Sound.
In plain terms. Today is slightly warmer than average for August. The forecast high of 51°F is 6.8°F above the 44°F typical for this month. The best window to be outside is roughly 6 PM to 9 PM, when temperature, rain chance and wind line up best. fishing is the strongest bet in South Island today at 8/10. Visibility is down to 0,2 mi - use low beams and leave extra following distance. Gusts to 38 mph will push high-sided vehicles on exposed roads and bridges. Wet roads are likely; braking distances roughly double in heavy rain.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about South Island
| Type | Island |
|---|---|
| Country | New Zealand |
| Continent | Oceania |
| Coordinates | 43°57′12.6″S 170°30′0″E (-43.9535, 170.5) |
| Known for | Southern Alps, fiords and glaciers |
| Local time | 11:45 PM (UTC+12:00) |
| Best months | February |
| Climate | Subarctic |
Weather map for South Island
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Explore South Island
Every topic we hold for this place, and the same topic for the places around it.
Climate for related places
Frequently asked questions
Where is South Island?
South Island is an island in New Zealand. Its coordinates are -43.9535, 170.5. It lies in Oceania.
What is the weather like in South Island right now?
It is currently 47°F (9°C) with partly cloudy. Humidity is 64% and wind is 21 mph.
When is the best time to visit South Island?
February offer the most comfortable conditions in South Island, which has a subarctic climate. July, September and October are usually the hardest months for outdoor plans.
What time zone is South Island in?
South Island observes Pacific/Auckland (UTC+12:00). The local time is 11:45 PM.
What is the nearest airport to South Island?
The closest airports are Queenstown Airport (ZQN), 114 mi away.
What are the top things to do in South Island?
Popular options include Aoraki / Mount Cook, Lake Wakatipu, Te Wahipounamu - South West New Zealand, Milford Sound and Fiordland National Park.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (islands) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 23, 2026 at 11:45 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
