AI-generatedShannon at a glance
- Best time
- Apr – Jul
- Warmest month
- Jul · 20°
- Warmest sea
- Aug · 16.2°
- Sunshine a year
- 1,340 h
- Rain a year
- 1,044 mm
- Climate
- Maritime
- Time zone
- UTC+0 / UTC+1
- Elevation
- 2 m
Climate in Shannon
Shannon has a maritime climate with moderate summers and cool, often grey winters. July is the warmest month with average highs of 20 °C, while January is the coolest at 9 °C. With around 1,340 hours of sunshine a year, Shannon is rather dull; May is the sunniest month with 5.9 hours a day.
Holiday weather through the year
Best time to visit Shannon
The best time to visit Shannon is from April to July. The sea stays too cool for a classic beach holiday: even in August it only reaches 16.2 °C. The wettest month is November with 105 mm of precipitation.
Shannon through the seasons
How the weather changes over the seasons, with averages for each.
Shannon in spring
Mar – May
Poor
- 11–16 °C by day
- Sea 10 °C
- 5.0 h of sun a day
- 40 rainy days in all
Shannon in summer
Jun – Aug
Poor
- 19–20 °C by day
- Sea 15 °C
- 4.8 h of sun a day
- 42 rainy days in all
Shannon in autumn
Sep – Nov
Poor
- 11–18 °C by day
- Sea 14 °C
- 3.0 h of sun a day
- 45 rainy days in all
Shannon in winter
Dec – Feb
Poor
- 9–10 °C by day
- Sea 10 °C
- 1.9 h of sun a day
- 46 rainy days in all
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
No month
15–28 °C and not too much rain
Rainy months
All year
Rainy season or more than 12 rainy days
Find your perfect month
Tell us what you like and we rate every month in Shannon for you.
Your best months: April – May, July
Based on the climate averages; tap a month to see its details.
Weather in October
Weather in October
Holiday weather in October
Poor
Best time to visit: April – July
Where to go in OctoberSea temperature in October
Keep in mindFrequent rain
A typical day in October
- Morning, 08:00: about 8°
- Midday, 13:00: about 14°
- Afternoon, 16:00: about 14°
- Evening, 20:00: about 12°
- Night, 23:00: about 11°
07:5918:43
Cool evenings: pack a jumper or a jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:38–08:46 · evening 17:56–19:04
- Blue hour
- Morning 07:25–07:38 · evening 19:04–19:18
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
October in Shannon compared with home
Loading the climate at home …
Early or late October?
In October, daytime highs fall from about 16° at the start of the month to 13° at the end. The sea cools from 15° to 13°. The days get 2.0 h shorter.
| October | 1 Oct | 31 Oct |
|---|---|---|
| Daytime high | 16° | 13° |
| Night-time low | 10° | 7° |
| Sea | 15° | 13° |
| Daylight | 11.7 h | 9.7 h |
What is the weather like in Shannon in October?
In October, Shannon is cool: daytime highs average 15 °C, and nights cool down to about 8 °C. The sea averages 13.9 °C – swimming is only for the hardy. The sun is scarce, with only about 3.0 hours a day. It rains often – on about 16 days, adding up to 102 mm. All in all, October is not an ideal month for a holiday in Shannon.
More details for October
- Daylight
- 10 h 44 min07:59 – 18:43
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 21 km/haverage daily peakAll months
- Cloud cover
- 77 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+1offset from UTC
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 20 %18 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- A jumper for the evenings
- Rain jacket or umbrella
Compare two months in Shannon
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
April has the better holiday weather in Shannon: score 15 against 4. In April, days are 1 °C cooler than in October. The sea is 4 °C cooler in April. April has 3 fewer rainy days. The sun shines 2 hours longer a day in April.
| Month | October | April |
|---|---|---|
| Holiday weather score | 4 | 15better |
| Daytime high | 15° | 14° |
| Night-time low | 8° | 6° |
| Sea | 13.9° | 10.1° |
| Sunshine | 3.0 h | 5.4 hbetter |
| Rainy days | 16 | 13better |
| Rainfall | 102 mm | 68 mmbetter |
Based on the climate averages 1996–2025.
Shannon month by month
The typical weather for every month at a glance.
4January9° · Sea 9° · 1.7 h
In January, Shannon is cold: daytime highs average 9 °C, and nights cool down to about 4 °C. The sea averages 9.4 °C – swimming is only for the hardy. The sun is scarce, with only about 1.7 hours a day. It rains often – on about 15 days, adding up to 91 mm. All in all, January is not an ideal month for a holiday in Shannon.
Shannon in January6February10° · Sea 9° · 2.4 h
In February, Shannon is cold: daytime highs average 10 °C, and nights cool down to about 4 °C. The sea averages 8.8 °C – swimming is only for the hardy. The sun is scarce, with only about 2.4 hours a day. Rain is frequent, with about 14 rainy days and 86 mm in total. All in all, February is not an ideal month for a holiday in Shannon.
Shannon in February9March11° · Sea 9° · 3.6 h
In March, Shannon is cool: daytime highs average 11 °C, and nights cool down to about 4 °C. The sea averages 9.0 °C – swimming is only for the hardy. The sun is scarce, with only about 3.6 hours a day. Rain is frequent, with about 13 rainy days and 78 mm in total. All in all, March is not an ideal month for a holiday in Shannon.
Shannon in March15April14° · Sea 10° · 5.4 h
In April, Shannon is cool: daytime highs average 14 °C, and nights cool down to about 6 °C. The sea averages 10.1 °C – swimming is only for the hardy. Expect around 5.4 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 68 mm in total. All in all, April is not an ideal month for a holiday in Shannon – and yet one of the best months here.
Shannon in April15May16° · Sea 12° · 5.9 h
In May, Shannon is mild: daytime highs average 16 °C, and nights cool down to about 8 °C. The sea averages 12.0 °C – swimming is only for the hardy. Expect around 5.9 hours of sunshine a day. It rains often – on about 14 days, adding up to 77 mm. All in all, May is not an ideal month for a holiday in Shannon – and yet one of the best months here.
Shannon in May15June19° · Sea 14° · 5.5 h
In June, Shannon is mild: daytime highs average 19 °C, and nights cool down to about 11 °C. The sea averages 14.2 °C – swimming is only for the hardy. Expect around 5.5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 77 mm in total. All in all, June is not an ideal month for a holiday in Shannon – and yet one of the best months here.
Shannon in June15July20° · Sea 16° · 4.4 h
In July, Shannon is mild: daytime highs average 20 °C, and nights cool down to about 13 °C. The sea averages 15.7 °C – swimming is only for the hardy. Expect around 4.4 hours of sunshine a day. Rain is frequent, with about 14 rainy days and 80 mm in total. All in all, July is not an ideal month for a holiday in Shannon – and yet one of the best months here.
Shannon in July12August19° · Sea 16° · 4.6 h
In August, Shannon is mild: daytime highs average 19 °C, and nights cool down to about 13 °C. The sea averages 16.2 °C – swimming is only for the hardy. Expect around 4.6 hours of sunshine a day. It rains often – on about 15 days, adding up to 93 mm. All in all, August is not an ideal month for a holiday in Shannon.
Shannon in August10September18° · Sea 15° · 3.9 h
In September, Shannon is mild: daytime highs average 18 °C, and nights cool down to about 11 °C. The sea averages 15.4 °C – swimming is only for the hardy. The sun is scarce, with only about 3.9 hours a day. Rain is frequent, with about 13 rainy days and 82 mm in total. All in all, September is not an ideal month for a holiday in Shannon.
Shannon in September4October15° · Sea 14° · 3.0 h
In October, Shannon is cool: daytime highs average 15 °C, and nights cool down to about 8 °C. The sea averages 13.9 °C – swimming is only for the hardy. The sun is scarce, with only about 3.0 hours a day. It rains often – on about 16 days, adding up to 102 mm. All in all, October is not an ideal month for a holiday in Shannon.
Shannon in October3November11° · Sea 12° · 2.1 h
In November, Shannon is cool: daytime highs average 11 °C, and nights cool down to about 6 °C. The sea averages 12.2 °C – swimming is only for the hardy. The sun is scarce, with only about 2.1 hours a day. It rains often – on about 16 days, adding up to 105 mm. All in all, November is not an ideal month for a holiday in Shannon.
Shannon in November2December10° · Sea 11° · 1.5 h
In December, Shannon is cold: daytime highs average 10 °C, and nights cool down to about 4 °C. The sea averages 10.5 °C – swimming is only for the hardy. The sun is scarce, with only about 1.5 hours a day. It rains often – on about 16 days, adding up to 105 mm. All in all, December is not an ideal month for a holiday in Shannon.
Shannon in DecemberClimate in detail
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Shannon
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
CoolOctober: nights around 8°. A duvet at night and a jumper for the evening.
The coolest nights are in January (4°), the warmest in July (13°). Nights fall below 8 °C on average from November to April, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 4 | 9° | 4° | 9.4° | 1.7 h | 15 | 91 |
| FebruaryFeb | 6 | 10° | 4° | 8.8° | 2.4 h | 14 | 86 |
| MarchMar | 9 | 11° | 4° | 9.0° | 3.6 h | 13 | 78 |
| AprilApr | 15 | 14° | 6° | 10.1° | 5.4 h | 13 | 68 |
| MayMay | 15 | 16° | 8° | 12.0° | 5.9 h | 14 | 77 |
| JuneJun | 15 | 19° | 11° | 14.2° | 5.5 h | 13 | 77 |
| JulyJul | 15 | 20° | 13° | 15.7° | 4.4 h | 14 | 80 |
| AugustAug | 12 | 19° | 13° | 16.2° | 4.6 h | 15 | 93 |
| SeptemberSep | 10 | 18° | 11° | 15.4° | 3.9 h | 13 | 82 |
| OctoberOct | 4 | 15° | 8° | 13.9° | 3.0 h | 16 | 102 |
| NovemberNov | 3 | 11° | 6° | 12.2° | 2.1 h | 16 | 105 |
| DecemberDec | 2 | 10° | 4° | 10.5° | 1.5 h | 16 | 105 |
Climate averages 1996–2025 (sunshine partly WMO station normals 1991–2020), not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
52.70° N, 8.86° W · 2 m · Europe/Dublin
Sea temperature in Shannon
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 13.4 – 14.6 °C
Swimming season: Always below 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Shannon ranges from 8.8 °C in February to 16.2 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
The sea warms up slowly: it is warmest in August, while the air already peaks in July. From November to January the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 15.8 and 16.9 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 9.4° | 8.8° | 9.9° | cold |
| FebruaryFeb | 8.8° | 8.3° | 9.3° | cold |
| MarchMar | 9.0° | 8.1° | 9.5° | cold |
| AprilApr | 10.1° | 9.4° | 10.8° | cold |
| MayMay | 12.0° | 11.1° | 13.0° | cold |
| JuneJun | 14.2° | 13.3° | 15.2° | cold |
| JulyJul | 15.7° | 14.8° | 16.8° | cold |
| AugustAug | 16.2° | 15.8° | 16.9° | cold |
| SeptemberSep | 15.4° | 14.8° | 16.0° | cold |
| OctoberOct | 13.9° | 13.4° | 14.6° | cold |
| NovemberNov | 12.2° | 11.5° | 12.7° | cold |
| DecemberDec | 10.5° | 10.0° | 11.1° | cold |
Sunshine hours in Shannon
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 3.0 of 10.7 hours of daylight in Shannon, 28 % of the daylight hours.
Sunshine hours: measured at the weather station 4 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
Rain in Shannon: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Shannon has about 16 rainy days with 102 mm of rain in total.
UV index in Shannon
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 2 · lowLittle protection needed; sunglasses on bright days.
The sun is strongest in June (UV 7).
Minutes until sunburn in October
- Very fair skin
- about 75 min
- Fair skin
- about 95 min
- Light brown skin
- over 2 h
- Olive skin
- over 2 h
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen the time, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Wind and clouds in Shannon
How breezy and how cloudy Shannon is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Shannon typically peaks at 21 km/h during the day: Beaufort 4, moderate breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting: Oct – Apr.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 77 % of the sky over Shannon: mostly cloudy, with about 3.0 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Planning a trip to Shannon
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Shannon in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Shannon has its best school-holiday weather during May half-term (score 15) and its weakest during the Christmas holidays (score 3).
- 13
Easter holidays
Mar – Apr
Poor
- 13 °C by day
- Sea 10 °C
- 4.9 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 15
May half-term
May – Jun
PoorBest holidays
- 17 °C by day
- Sea 12 °C
- 5.8 h of sun a day
- 14 rainy days a month
Keep in mind: Frequent rain
- 13
Summer holidays
Jul – Aug
Poor
- 20 °C by day
- Sea 16 °C
- 4.5 h of sun a day
- 15 rainy days a month
Keep in mind: Frequent rain
- 4
October half-term
Oct
Poor
- 15 °C by day
- Sea 14 °C
- 3.0 h of sun a day
- 16 rainy days a month
Keep in mind: Frequent rain
- 3
Christmas holidays
Dec – Jan
Poor
- 9 °C by day
- Sea 10 °C
- 1.6 h of sun a day
- 16 rainy days a month
Keep in mind: Frequent rain
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 1 h 15 min
- Distance
- 590 km
- Time zone
- UTC+1
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Compare & alternatives
Shannon compared
Put Shannon side by side with another destination.
Shannon vs Adare
In October the holiday weather in Shannon and Adare is about equally good (score 4 vs 3). During the day Adare is 1 °C cooler than Shannon.
| in October | Shannon | Adare |
|---|---|---|
| Holiday weather score | 4 | 3 |
| Daytime high | 15° | 14° |
| Sea | 14° | no sea nearby |
| Sunshine | 3 h | 3 h |
| Rainy days | 16 | 16 |
| Best time | Apr – Jul | May – Sep |
Through the year
Ireland in October: the best places
In October, Shannon ranks 30 among the 31 nearest destinations in this country.
- Clonmel15°47
- 2Dungarvan15°14°44
- 3Kilkenny14°43
- 4Cork14°14°42
- 5Tullamore14°42
- 6Bantry15°14°42
- 7Waterford15°42
- 8Adare14°41
- 30ShannonThis page15°14°4
Near Shannon
Other destinations close by.
Places with a climate like Shannon
Destinations whose weather through the year is closest to Shannon's – good alternatives.
Frequently asked questions about Shannon
When is the best time to visit Shannon?
The best time to visit Shannon is from April to July. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Shannon?
The sea temperature in Shannon ranges from 8.8 °C in February to 16.2 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
Can you swim in Shannon in October?
Only if you don't mind cold water: in October the sea averages just 13.9 °C. Comfortable swimming temperatures are not reached at any time of year.
What is the warmest month in Shannon?
July is the warmest month, with average highs of 20 °C and nights around 13 °C. January is the coolest month at 9 °C.
When does it rain most in Shannon?
The wettest month is November with 105 mm of precipitation. The driest month is April with 68 mm.
How many hours of sunshine does Shannon get?
Shannon gets around 1,340 hours of sunshine a year. The sunniest month is May with 5.9 hours a day; in December there are 1.5 hours a day.
What time zone is Shannon in?
Shannon is on UTC+0 in January and UTC+1 in July.
How long is the flight from London to Shannon?
A nonstop flight from London to Shannon takes about 1 h 15 min, for a straight-line distance of about 590 km.
Which school holidays are best for Shannon?
Shannon has its best school-holiday weather during May half-term (score 15) and its weakest during the Christmas holidays (score 3). Holiday ratings (0–100): Easter holidays 13, May half-term 15, summer holidays 13, October half-term 4, Christmas holidays 3.