Avg High
Wellington in September
Avg Low
Rain
Daylight
12h
What to expect
In Wellington, September sits in early spring, a shoulder-season month where the feel can shift as the season turns. Most days sit on the cooler side, and relatively steady temperatures through the day. Daylight is moderate, so steady pacing works well. Comfort is usually predictable, so a standard day plan works well.
September in context
How it compares to the rest of the year in Wellington.
Hottest (avg)
#9 / 12
Wettest (avg)
#5 / 12
Daylight Hours
#7 / 12
Windiest (avg)
#3 / 12
Highest UV
#7 / 12
Most Humid
#9 / 12
Monthly climate breakdown
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight hours
- 11.8 h
- UV index (max)
- 6
- Typical sun hours
- 07:21 - 19:10
Rain & Snow
- Total rain
-
- Rainy days
- 14 days
- Cloud cover (avg)
- 58%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 78%
- Wind (avg)
-
- Wind (max gusts)
-
Daily climate explorer
Day 15 selected for September. Typical high 13.2°C and low 10.7°C.
Typical disruptions in September
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in September.
Wind High impact
Strong gusts Measures: Strong gust days (>=60 km/h). Observed about 55% of days (16.5 days/month) in September. Historical risk signal only, not a day-by-day forecast.
16.5 days / month
~55% of days
Why this matters
- Expected days 16.5 days / month
- Probability ~55% of days
- Intensity Up to ~111km/h (P95)
Strong gusts are possible on ~17 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cold High impact
Cold feels-like nights Measures: Cold feels-like nights (min <=5C). Observed about 41% of days (12.4 days/month) in September. Historical risk signal only, not a day-by-day forecast.
12.4 days / month
~41% of days
Why this matters
- Expected days 12.4 days / month
- Probability ~41% of days
- Intensity Up to ~5°C (P95)
Cold feels-like nights are possible on ~12 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Wind High impact
Severe gusts Measures: Severe gust days (>=80 km/h). Observed about 24% of days (7.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.
7.3 days / month
~24% of days
Why this matters
- Expected days 7.3 days / month
- Probability ~24% of days
- Intensity Up to ~118km/h (P95)
Severe gusts are possible on ~7 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain High impact
Rain disruption Measures: Likely rain disruption days. Observed about 17% of days (5.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
5.2 days / month
~17% of days
Why this matters
- Expected days 5.2 days / month
- Probability ~17% of days
- Intensity Up to ~24mm (P95)
Rain disruption risk appears on ~5 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain High impact
Washout risk Measures: Washout day risk. Observed about 17% of days (5.1 days/month) in September. Historical risk signal only, not a day-by-day forecast.
5.1 days / month
~17% of days
Why this matters
- Expected days 5.1 days / month
- Probability ~17% of days
- Intensity Up to ~24mm (P95)
Washout conditions are possible on ~5 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Wind disruption Measures: Disruptive wind days. Observed about 10% of days (3.0 days/month) in September. Historical risk signal only, not a day-by-day forecast.
3.0 days / month
~10% of days
Why this matters
- Expected days 3.0 days / month
- Probability ~10% of days
- Intensity Up to ~129km/h (P95)
Disruptive wind is possible on ~3 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Show all disruptions (21 more)
Rain High impact
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 7% of days (2.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
2.2 days / month
~7% of days
Why this matters
- Expected days 2.2 days / month
- Probability ~7% of days
- Intensity Up to ~34mm (P95)
Heavy rain is possible on ~2 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Stormy conditions Measures: Storm-impact proxy days. Observed about 7% of days (2.1 days/month) in September. Historical risk signal only, not a day-by-day forecast.
2.1 days / month
~7% of days
Why this matters
- Expected days 2.1 days / month
- Probability ~7% of days
- Intensity Up to ~116km/h (P95)
Stormy conditions are possible on ~2 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain High impact
Washout run Measures: Multi-day washout runs. Observed about 1.1 days/month in September. Historical risk signal only, not a day-by-day forecast.
1.1 days / month
Probability unavailable
Why this matters
- Expected days 1.1 days / month
- Probability —
- Intensity Up to ~24mm (P95)
Multi-day washout runs are possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Wind disruption run Measures: Multi-day wind disruption runs. Observed about 0.6 days/month in September. Historical risk signal only, not a day-by-day forecast.
0.6 days / month
Probability unavailable
Why this matters
- Expected days 0.6 days / month
- Probability —
- Intensity Up to ~129km/h (P95)
Multi-day disruptive wind runs are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain High impact
Very heavy rain Measures: Very heavy rain days (>=25mm). Observed about 1% of days (0.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~47mm (P95)
Very heavy rain is possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 85% of days (25.5 days/month) in September. Historical risk signal only, not a day-by-day forecast.
25.5 days / month
~85% of days
Why this matters
- Expected days 25.5 days / month
- Probability ~85% of days
- Intensity Up to ~105km/h (P95)
Gusty conditions are possible on ~25 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 56% of days (16.9 days/month) in September. Historical risk signal only, not a day-by-day forecast.
16.9 days / month
~56% of days
Why this matters
- Expected days 16.9 days / month
- Probability ~56% of days
- Intensity Up to ~15mm (P95)
Measurable rain is possible on ~17 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 49% of days (14.8 days/month) in September. Historical risk signal only, not a day-by-day forecast.
14.8 days / month
~49% of days
Why this matters
- Expected days 14.8 days / month
- Probability ~49% of days
- Intensity Up to ~100% (P95)
Cloudy skies are possible on ~15 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 48% of days (14.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.
14.3 days / month
~48% of days
Why this matters
- Expected days 14.3 days / month
- Probability ~48% of days
- Intensity Up to ~91% (P95)
High humidity is possible on ~14 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Rain Minor
Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 46% of days (13.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.
13.7 days / month
~46% of days
Why this matters
- Expected days 13.7 days / month
- Probability ~46% of days
- Intensity Up to ~21h (P95)
Several rainy hours are possible on ~14 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Minor
Breezy days Measures: Breezy days (mean wind >=25 km/h). Observed about 39% of days (11.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.
11.7 days / month
~39% of days
Why this matters
- Expected days 11.7 days / month
- Probability ~39% of days
- Intensity Up to ~42km/h (P95)
Breezy conditions are possible on ~12 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 34% of days (10.1 days/month) in September. Historical risk signal only, not a day-by-day forecast.
10.1 days / month
~34% of days
Why this matters
- Expected days 10.1 days / month
- Probability ~34% of days
- Intensity Up to ~22h (P95)
Wet-most-of-day conditions are possible on ~10 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 29% of days (8.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.
8.6 days / month
~29% of days
Why this matters
- Expected days 8.6 days / month
- Probability ~29% of days
- Intensity Up to ~100% (P95)
Mostly cloudy skies are possible on ~9 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cloud Minor
Overcast days Measures: Overcast days (cloud cover >=95%). Observed about 11% of days (3.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.
3.3 days / month
~11% of days
Why this matters
- Expected days 3.3 days / month
- Probability ~11% of days
- Intensity Up to ~100% (P95)
Overcast skies are possible on ~3 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Wind Minor
Windy days Measures: Windy days (mean wind >=35 km/h). Observed about 10% of days (3.0 days/month) in September. Historical risk signal only, not a day-by-day forecast.
3.0 days / month
~10% of days
Why this matters
- Expected days 3.0 days / month
- Probability ~10% of days
- Intensity Up to ~47km/h (P95)
Strong mean winds are possible on ~3 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cold Minor
Cold days Measures: Cold days (max <=10C). Observed about 8% of days (2.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.
2.3 days / month
~8% of days
Why this matters
- Expected days 2.3 days / month
- Probability ~8% of days
- Intensity Up to ~10°C (P95)
Cold daytime conditions are possible on ~2 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Visibility Minor
Fog-likely signal Measures: Fog-likely visibility proxy. Observed about 2% of days (0.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.7 days / month
~2% of days
Why this matters
- Expected days 0.7 days / month
- Probability ~2% of days
- Intensity Up to ~96% (P95)
Fog-likely conditions are possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Other Minor
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data Measures: Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data. Observed about 2% of days (0.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.7 days / month
~2% of days
Why this matters
- Expected days 0.7 days / month
- Probability ~2% of days
- Intensity Up to ~96 (P95)
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data is possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cold Minor
Wind chill risk Measures: Wind chill risk days. Observed about 2% of days (0.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.7 days / month
~2% of days
Why this matters
- Expected days 0.7 days / month
- Probability ~2% of days
- Intensity Up to ~-0°C (P95)
Wind chill risk is possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cold Minor
Cold nights Measures: Cold nights (min <=5C). Observed about 2% of days (0.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.6 days / month
~2% of days
Why this matters
- Expected days 0.6 days / month
- Probability ~2% of days
- Intensity Up to ~5°C (P95)
Cold nights are possible on ~1 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Cold Minor
Cold snap run Measures: Cold snap runs (>=3 cold days). Observed about 0.1 days/month in September. Historical risk signal only, not a day-by-day forecast.
0.1 days / month
Probability unavailable
Why this matters
- Expected days 0.1 days / month
- Probability —
- Intensity Up to ~10°C (P95)
Cold snap runs are possible on ~0 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Frequently asked questions
Is September a good time to visit Wellington?
Typical September days in Wellington reach highs of 13°C (55°F) with nights around 9°C (48°F). It usually feels cool by day and cool after dark. Overall, September sits in the middle of the Wellington climate range.
What are temperatures like in September?
In September, you can usually expect highs of 13°C (55°F) and lows near 9°C (48°F). That means cool days and cool nights, so pack layers you can add or remove.
How much does it rain in September?
Rainfall in September averages 78 mm (3.1 in) across roughly 14 days. Overall it is a very wet time of year, so a light rain jacket and waterproof shoes are very handy.
How many hours of daylight are there in September?
You can expect about 12 hours of daylight in September. Sunrise is typically around 07:21 and sunset near 19:10. Daylight is fairly typical, with enough time for sightseeing.
How strong is the sun in September?
UV levels are moderate (around 6); sunscreen and sunglasses are still a good idea.
Is it windy in September?
In September, average wind speeds are around 22 km/h (14 mph), with gusts on the windiest days reaching about 97 km/h (60 mph). On the ground, it is it is a notably windy place, and strong gusts are fairly common.