Ireland
Galway in September: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Galway in September is climatically mixed. The average daily high is around 17 °C, and the sea is about 15 °C. With about 17 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
40/100 · #4
Warmth
#4
Dryness
#6
Sun
#6
Sea warmth
#3
Published best categories: none
Galway · SeptemberPhoto: Wolfgang Glock · CC BY-SA 3.0Climate facts
- Average high
- 17 °C
- Average low
- 10 °C
- Sea
- 15 °C
- Rainy days (est.)
- 17 rainy days (est.)
- Sun (est.)
- 4 h/day
- Humidity
- 86 %
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 | 19 | 11 | 18 | 103 | 4.8 | 83 | 3.3 | 16 | 47 |
| September (selected) | 17 | 10 | 17 | 87 | 3.6 | 86 | 3.4 | 15 | 40 |
| October | 13 | 7 | 19 | 110 | 2.1 | 90 | 3.6 | 14 | 23 |
How do the previous and next months compare?
Baseline: September (40/100)
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 | +7 | +2.1 °C | +1.7 °C | +1.9 | +15.5 mm | +1.2 h | -3 % | -0.1 m/s | +0.8 °C |
| October | -17 | -3.9 °C | -2.4 °C | +2.2 | +22.6 mm | -1.5 h | +4.6 % | +0.2 m/s | -1.6 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Galway in September?
The average daily high is around 17 °C, with an average daily low of about 10 °C.
Can you swim in Galway in September?
The sea is about 15 °C (cold).
Does it rain a lot in Galway in September?
The curated estimate is about 17 rainy days per month, not a directly measured long-term average. Total precipitation averages around 87 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Galway?
No month in Galway reaches the threshold for a clear recommendation in the climate score; the month comparison above shows the differences.