Australia
Adelaide in September: weather, sea & travel advice
This month's data profile
Clear transition month
Adelaide in September is climatically well suited to city breaks and active holidays and hiking. The average daily high is around 18 °C, and the sea is about 14 °C. With about 9 rainy days it is moderate.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
58/100 · #9
Warmth
#9
Dryness
#8
Sun
#7
Sea warmth
#10
Published best categories: none
Adelaide · SeptemberPhoto: Maggas at English Wikipedia · Public domainClimate facts
- Average high
- 18 °C
- Average low
- 8 °C
- Sea
- 14 °C
- Rainy days (est.)
- 9 rainy days (est.)
- Sun (est.)
- 6 h/day
- Humidity
- 72 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| August | 15 | 7 | 12 | 53 | 4.3 | 76 | 2.6 | 13 | 43 |
| September (selected) | 18 | 8 | 9 | 50 | 5.9 | 72 | 2.6 | 14 | 58 |
| October | 21 | 10 | 6 | 32 | 7.6 | 64 | 2.7 | 16 | 75 |
How do the previous and next months compare?
Baseline: September (58/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| August | -15 | -2.6 °C | -1.3 °C | +2.3 | +2.8 mm | -1.6 h | +4.7 % | ±0 m/s | -0.9 °C |
| October | +17 | +3.4 °C | +1.7 °C | -3.4 | -17.3 mm | +1.7 h | -7.3 % | +0.1 m/s | +1.8 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Adelaide in September?
The average daily high is around 18 °C, with an average daily low of about 8 °C.
Can you swim in Adelaide in September?
The sea is about 14 °C (cold).
Does it rain a lot in Adelaide in September?
The curated estimate is about 9 rainy days per month, not a directly measured long-term average. Total precipitation averages around 50 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Adelaide?
By the climate score, January, February, March and December are the strongest months for Adelaide. For a beach trip: January, February, March and December. September is not among them.