Portland climate
Typical historical weather for Portland, Australia, averaged across 10 years of hourly climate data. Pick a date for a specific day.
Want today's actual conditions instead? See the current forecast for Portland.
Annual average
14.1°C
across all months
Warmest month
20.7°C
Jan average high
Coolest month
9.3°C
Jul average low
Annual rainfall
822mm
total per year
Portland is typically hottest in January and coolest in July, a swing of about 11.4°C across the year. About 38% of annual rainfall falls in the three wettest months (July is typically wettest, February driest).
Monthly averages
Average daily high/low temperature (band) and monthly rainfall (bars).
| Month | Avg high | Avg low | Rainfall | Wet days | Humidity | Wind | Cloud | Solar |
|---|---|---|---|---|---|---|---|---|
| Jan | 20.7°C (26.4–35.1) | 15°C (11.3–13.5) | 38mm | 5 | 73% | 5.3 m/s | 58% | 7 kWh/m² |
| Feb | 20.3°C (23.8–32.1) | 15.1°C (10.8–13.4) | 28mm | 5 | 73% | 5.4 m/s | 60% | 6 kWh/m² |
| Mar | 19.7°C (22.4–34.6) | 14.6°C (9.4–12.6) | 35mm | 7 | 74% | 5.2 m/s | 61% | 4.7 kWh/m² |
| Apr | 17.7°C (21.3–27.6) | 13°C (8.2–10.8) | 44mm | 9 | 74% | 5 m/s | 68% | 3.1 kWh/m² |
| May | 15.3°C (18–23.3) | 11.2°C (6.2–8.2) | 80mm | 15 | 76% | 5.9 m/s | 67% | 2.2 kWh/m² |
| Jun | 13.3°C (15–17.5) | 9.7°C (4.9–7.8) | 95mm | 15 | 78% | 5.7 m/s | 68% | 1.8 kWh/m² |
| Jul | 12.9°C (15.4–16.9) | 9.3°C (4.8–7.7) | 117mm | 18 | 78% | 6.6 m/s | 67% | 1.9 kWh/m² |
| Aug | 13.5°C (16–20.1) | 9.3°C (5.5–7.3) | 104mm | 17 | 77% | 6.4 m/s | 65% | 2.7 kWh/m² |
| Sep | 14.3°C (16.9–24.1) | 9.8°C (5.9–8.1) | 90mm | 15 | 75% | 6.4 m/s | 67% | 3.9 kWh/m² |
| Oct | 15.7°C (19.3–27.2) | 10.5°C (6.6–9) | 82mm | 12 | 75% | 5.9 m/s | 67% | 5.1 kWh/m² |
| Nov | 17.1°C (23.9–29.3) | 11.8°C (7.5–10.1) | 67mm | 11 | 75% | 5.7 m/s | 68% | 6.2 kWh/m² |
| Dec | 18.8°C (25.2–36.1) | 13.1°C (9.3–11.7) | 45mm | 7 | 73% | 5.6 m/s | 63% | 6.9 kWh/m² |
Figures in parentheses show the range of that month's average high/low across every year on file — a wide range means the month varies more from year to year. A "wet day" is any day with at least 1.0mm of rain.
Year to year
Annual average temperature, 2016–2025.
Across these 10 years, the annual average has moved by about +0.05°C per decade. That’s a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
Annual rainfall has moved by about -249.06mm per decade over the same period.
2025 (the most recent year on file) averaged 14.282900959171682°C, above the 9-year baseline of 14.09°C by 0.89 standard deviations.
Typical extremes per year
Rainy days
134.9 days
≥1.0mm rain
Heavy rain days
3.1 days
≥20mm rain
Extreme heat days
0 days
daily high ≥40°C
Frost days
0 days
daily low ≤0°C
Averaged across 10 years on file. Thresholds match PastClimate's data pipeline definitions — see data & sources.
Records on file
Ranked across 10 years of data currently on file (2016–2025).
Hottest day
36.1°C
20 December 2019
2019 was 0.48 SD below the 9-year average that year
Coldest day
4.8°C
20 July 2022
2022 was 0.17 SD below the 9-year average that year
Wettest day
60.5mm
16 November 2017
2017 was 1.42 SD above the 9-year average that year
Windiest day
13.9m/s
2 September 2024
2024 was 1.26 SD above the 9-year average that year
See the detail: Portland on 16 November 2017.
Nearby cities
Port Fairy
65.5km away
Koroit
65.5km away
Hamilton
70.8km away
Mount Gambier
86.1km away
Warrnambool
87.3km away
Terang
131km away
Want a side-by-side view instead? Compare Portland with another city.
Frequently asked questions about Portland's climate
What is the hottest month in Portland?
January is typically the warmest month in Portland, with an average high of 20.7°C. July is typically the coolest, averaging 9.3°C overnight.
How much does it rain in Portland?
Portland gets about 822mm of rain a year on average, with roughly 38% of it falling in the three wettest months (July is typically the wettest, February the driest).
How many extremely hot or cold days does Portland have?
On average, Portland sees about 0 day(s) a year at or above 40°C and about 0 day(s) at or below 0°C, based on 10 years of data.
Is Portland getting warmer?
Across the 10 years on file (2016–2025), the annual average temperature has moved by about +0.05°C per decade. That's a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
What is the hottest day on record for Portland?
The hottest day on file is 20 December 2019 at 36.1°C, out of 10 year(s) searched.
Data & provenance
↓ Download monthly CSVData source & coverage — ERA5 reanalysis, 2016–2025 (10 years)details
- Source
- ERA5 reanalysis, accessed via the Copernicus Climate Change Service (C3S) Climate Data Store
- Data type
- Reanalysis — a physically consistent reconstruction combining a forecast model with historical observations, not a live station reading or a forecast
- Coverage
- 2016–2025 (10 years) for Australia
- Location
- Portland — -38.250°, 141.500°, ERA5 grid cell center, 13.9 km from requested point
- Time zone
- Australia/Melbourne
- What's shown here
- Monthly and annual averages, and dated extreme-value records, derived from an hourly base record.
- Spatial resolution
- 0.25° (~25 km) distributed grid — ERA5's native model resolution is finer; this is the publicly distributed regridded product
- Version / refreshed
- Methodology v2026.07 · data last refreshed December 31, 2025
- Limitations
- A model reconstruction, not a station observation — hyper-local extremes (a single storm cell, an urban heat pocket) can differ from a nearby gauge. See the full methodology.
- Attribution
- Generated using Copernicus Climate Change Service information
Cite this data
PastClimate (2026-07-17). Historical climate data for Portland, Australia (-38.25°S, 141.50°E), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Portland, Australia [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Portland, Australia." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Portland, Australia},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-17},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.