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Westport Weather in September
Thinking of visiting Westport in September? Expect moderate temperatures reaching 17°C (63°F) during the day, dropping to 10°C (50°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Westport in September
Analyzing past climate data, one can expect approximately 21 days of rain, averaging 101 mm (4 in). Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Westport in September
September in Westport brings typical temperatures with highs around 17°C (63°F) and lows of 10°C (50°F). The difference between afternoon and evening temperatures is usually noticeable. With overnight lows of 10°C (50°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Westport in September
The city usually sees around 93 hours of sunlight, indicating fewer sunny days.Should you favor a climate that's both dry and comfortably warm, May, June, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Westport Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
17°C (63°F)
Chance of Rain
70%
Precipitation
101 mm (4 in)
Rainy days
21 days
Humidity
83% *
Sunshine
93 hours *
Percentage Sunshine
26% *
* Data from: Claremorris, Ireland (36 KM, 22 Miles).
Westport Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Westport - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Westport typically stay consistent throughout September, with daily highs averaging around 17°C (63°F). Nights are cool, with lows typically ranging from 9°C (48°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Westport in September
Browse day-by-day weather records for Westport spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Westport historical weather extremes in September
Based on 50 years of weather observations in Westport between 1976 and 2026, these are the recorded extremes.
- The warmest day in September was on September 7, 2023, with a maximum of 26°C (79°F).
- Westport experienced its chilliest September day on September 26, 2024, reaching only 10°C (50°F).
- Westport registered its coldest September night on September 5, 1992, with temperatures dropping to 2°C (36°F).
Best Places in Ireland in September
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Westport in September
For Westport in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. With limited sunshine expected, sunglasses aren't a priority for packing.
What To Do in Westport in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming4/10 -
Cycling5/10 -
Walking5/10 -
Camping6/10 -
Outdoor sports9/10
Westport 3-Day Forecast
More climate data for Westport
Temperature Rainfall Sunshine Humidity
See the full Westport climate overview or explore weather in Ireland.
Popular in September
Where to go in September - average daytime high across popular destinations.
Westport
17°C (63°F) Doolin17°C (63°F) Kilkenny
18°C (64°F) Cork18°C (64°F) Kenmare18°C (64°F) Killarney17°C (63°F) Galway18°C (64°F) Dublin18°C (64°F) Bucket list
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