Sumner, Australia experiences average highs of 26°C (79°F) and lows of 16°C (61°F) throughout the year. Rainfall is moderate, averaging about 9 rainy days per month. Sunshine is abundant, averaging about 10 hours per day. Average highs have stayed broadly stable across the available records.
Sumner, Australia Weather & Climate 2026
Monthly climate averages for Sumner, Australia. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Apr–Sep 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
7.8/10
Best: April, August, September, November
UV Index
7
High
Temperature 26°C / 16°C
Feels Like 27°C / 17°C
Rainy Days 9
Rainfall 85 mm
Sunshine 10 h
Humidity 72%
Wind Speed 15 km/h
Dew Point 16°C
Hottest Month
30°C
January
Avg Low 22°C
Rain 12 days
Coldest Month
10°C
July
Avg High 21°C
Rain 6 days
Driest Month
5 days
August
Avg High 23°C
Avg Low 11°C
Windiest Month
17 km/h
November (Gusts 40)
Worst Time to Visit
Consider avoiding January, February, March due to frequent rain.
Sun Position
Sunrise 06:38
Daylight 10.6h
Sunset 17:11
Live conditions —
Sumner on the map · live conditions
Sumner, Australia
- Continent
- Oceania
- Country
- Australia
- City
- Sumner
- Population
- 579
- Coordinates
- -27.57°, 152.93°
Seasonal Breakdown
Spring
Sep–Nov
Avg High 27°C
Avg Low 16°C
Rain 9 days/mo
2/3 best months
Summer
Dec–Feb
Avg High 30°C
Avg Low 21°C
Rain 12 days/mo
Autumn
Mar–May
Avg High 26°C
Avg Low 17°C
Rain 11 days/mo
1/3 best months
Winter
Jun–Aug
Avg High 21°C
Avg Low 11°C
Rain 6 days/mo
1/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
High Low Shaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 30°C / 22°C . Feb: 30°C / 21°C . Mar: 28°C / 21°C . Apr: 26°C / 17°C . May: 23°C / 14°C . Jun: 21°C / 11°C . Jul: 21°C / 10°C . Aug: 23°C / 11°C . Sep: 25°C / 14°C . Oct: 27°C / 17°C . Nov: 29°C / 19°C . Dec: 30°C / 21°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 102 mm. Feb: 144 mm. Mar: 201 mm. Apr: 56 mm. May: 64 mm. Jun: 42 mm. Jul: 38 mm. Aug: 32 mm. Sep: 36 mm. Oct: 110 mm. Nov: 95 mm. Dec: 104 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 74%. Feb: 74%. Mar: 78%. Apr: 74%. May: 74%. Jun: 73%. Jul: 71%. Aug: 68%. Sep: 67%. Oct: 71%. Nov: 69%. Dec: 72%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 16 km/h . Feb: 17 km/h . Mar: 16 km/h . Apr: 14 km/h . May: 13 km/h . Jun: 13 km/h . Jul: 14 km/h . Aug: 14 km/h . Sep: 16 km/h . Oct: 17 km/h . Nov: 17 km/h . Dec: 17 km/h .
Sunshine
Sunshine
Sunshine: Jan: 11h. Feb: 10h. Mar: 9h. Apr: 10h. May: 9h. Jun: 9h. Jul: 9h. Aug: 10h. Sep: 10h. Oct: 10h. Nov: 11h. Dec: 11h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 8. Feb: UV 8. Mar: UV 6. Apr: UV 6. May: UV 5. Jun: UV 4. Jul: UV 4. Aug: UV 5. Sep: UV 7. Oct: UV 8. Nov: UV 8. Dec: UV 9.
Monthly Daylight Hours
Daylight 12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending wetter by about 55 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jan 2025 · 30°C | Jan · 30°C |
| Coldest month | Jul 2025 · 10°C | Jul · 10°C |
| Wettest month | Mar 2025 · 620 mm | Mar · 201 mm |
| Windiest month | Mar 2025 · 18 km/h | Nov · 17 km/h |
Month-by-Month Weather Table
January
Fair 
February
Fair March
Wet April best
Excellent May
Good June
Good July
Good August best
Excellent September best
Excellent October
Good November best
Excellent December
Good | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 30°C / 22°C | 33°C / 24°C | 12days (102 mm) Wet | 11h Excellent | 74% Muggy | 8.3 Very High | Fair | View Details |
| February | 30°C / 21°C | 32°C / 24°C | 12days (144 mm) Wet | 10.4h Excellent | 74% Muggy | 8.1 Very High | Fair | View Details |
| March | 28°C / 21°C | 31°C / 23°C | 17days (201 mm) Wet | 9.3h Good | 78% Humid | 6.1 High | Wet | View Details |
| April best | 26°C / 17°C | 26°C / 18°C | 8days (56 mm) Wet | 9.7h Good | 74% Muggy | 6 High | Excellent | View Details |
| May | 23°C / 14°C | 23°C / 13°C | 8days (64 mm) Wet | 8.6h Good | 74% Muggy | 4.5 Moderate | Good | View Details |
| June | 21°C / 11°C | 19°C / 9°C | 6days (42 mm) Good | 8.5h Good | 73% Muggy | 4.2 Moderate | Good | View Details |
| July | 21°C / 10°C | 19°C / 8°C | 6days (38 mm) Good | 8.6h Good | 71% Muggy | 4.4 Moderate | Good | View Details |
| August best | 23°C / 11°C | 21°C / 9°C | 5days (32 mm) Good | 9.5h Good | 68% Muggy | 5.4 High | Excellent | View Details |
| September best | 25°C / 14°C | 25°C / 13°C | 6days (36 mm) Good | 10.1h Excellent | 67% Muggy | 6.9 High | Excellent | View Details |
| October | 27°C / 17°C | 28°C / 17°C | 11days (110 mm) Wet | 10.1h Excellent | 71% Muggy | 7.9 Very High | Good | View Details |
| November best | 29°C / 19°C | 30°C / 20°C | 10days (95 mm) Wet | 11h Excellent | 69% Muggy | 7.9 Very High | Excellent | View Details |
| December | 30°C / 21°C | 33°C / 23°C | 11days (104 mm) Wet | 11.4h Excellent | 72% Muggy | 8.8 Very High | Good | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Sumner are April, August, September, November, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Sumner, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Sumner is January, with average daytime highs of 30°C (86°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Sumner is July, with average overnight lows of 10°C (50°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Sumner is March, averaging 201mm of precipitation across 17 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Sumner runs through March, January, February, October, with the heaviest rainfall in March. Based on 10-year averages for Sumner.
Sumner receives approximately 118 sunshine hours per year. The sunniest month is December with around 11 hours. Based on climate data for Sumner.
The least favorable months to visit Sumner are January, February, March, primarily due to frequent rain. For the best conditions, consider April, August, September, November instead.
The annual average UV index in Sumner is 7, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Sumner is 72%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Average wind speeds in Sumner are 15 km/h (9 mph). The windiest month is November with peak winds reaching 17 km/h (11 mph) (gusts up to 40 km/h / 25 mph).
Sumner averages 7 clear-sky days per month with overall cloud cover around 44%. The clearest skies occur in August.
The annual average dew point in Sumner is 16°C (61°F), which feels noticeably humid. Summer months may feel slightly sticky, but conditions remain manageable for most people.
Sumner has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Sumner ranges from 17°C (63°F) to 27°C (81°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, July is a great time to visit Sumner. It earns a climate score of 7.8/10 with Good.
For July in Sumner, pack Warm evening layer, Umbrella, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. With average highs of 21°C (69°F) and 6 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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