Weather and seasons
May and June. May is the driest month at Valentia (94.4 mm over 13.5 wet days) and June has the fewest wet days of any month (12.8) with light until after 22:00, which is what the 27 km and 29 km north-coast stages want. Both sit inside the March to October support season, both are before the July and August crowds, and May gives the best odds of actually seeing anything from the Masatiompan saddle.
Kerry is wet and windy, not cold. Valentia Observatory averages a January day of 9.8 C and an August day of 18 C, and outside the Brandon crossing the route stays near sea level, so rain, wind and daylight decide the month rather than temperature. May and June are the driest and brightest, November to January the wettest at 179 to 189 mm over roughly 21 wet days each, and the commercial season follows the same shape: the peninsula's luggage transfer and the self-guided operators we checked both publish 1 March to 31 October, the Blasket Centre at Dún Chaoin runs from early March to early November, and campsites work roughly Easter to late September. Outside that window Tralee and Dingle town trade normally while the small western villages become a phone call rather than a booking site, and we could not establish which individual B&Bs keep winter hours. One thing does not change with the month: the Feothanach to Cloghane stage crosses the saddle at around 650 m between Más an Tiompáin and Piaras Mór, there is no low-level line around it, and the trail committee's own advice is that in poor visibility you should give serious consideration to reaching Cloghane by other transport. One weekly pattern is worth planning around even though we could not stand it up. None of the pubs at Camp publishes opening hours of its own anywhere we could find, and a walker who did the full circuit in 2024 records finding every restaurant in Camp shut on a Monday and a Tuesday, and being fed grilled cheese by a barman instead. That is one voice, no business has said any such thing, and a third-party listing shows one of the Camp bars open on a Monday, which is a different question from whether a kitchen is running. Camp is a stage end twice over: our 9 and 10 day plans stop there on night one at km 16.8, and all three plans stop there again at km 161.8 on the night before Tralee. If either of those lands early in the week, ring ahead about an evening meal instead of assuming one.
Mild rather than cold at a 9.8 C day, so what limits January is water, wind and light, not temperature. The longest stage, Cloghane to Castlegregory, is given 7 to 9 hours by the trail committee and there are 8.3 hours of daylight.
9.8°C high · 5.1°C low · 8.3 h (sunrise 08:40, sunset 17:00 local at Dingle)Watch for: Wind on the high crossing and on the beaches, and spring tides backed by onshore gales, which is when the 11 km of Fermoyle Strand stops being the easy option.Rain falls well off the winter peak to 137 mm and light is back to ten hours, the first real change since November. The ground has had a full winter and has not begun to recover. Note the one-day access closure set out in closed season.
9.9°C high · 5.1°C low · 10.0 h (sunrise 07:54, sunset 17:56 local at Dingle)Watch for: Gales are still frequent and the exposed western stages give nowhere to sit one out.The first month that works if you accept wet ground. Light reaches 11.9 hours, rainfall drops to 116 mm, and 1 March is the published start of both the luggage transfer and the self-guided walking season, so support on the route exists again.
10.8°C high · 5.5°C low · 11.9 h (sunrise 06:53, sunset 18:47 local at Dingle, clocks go forward at the end of the month)Watch for: Ticks. Irish public health guidance puts tick activity from spring to autumn, and long grass, bracken and paths bordered by rough vegetation are exactly what this route is made of.One of the two driest months at 108 mm, fourteen hours of light, the full support season running and no midges yet. Fourteen hours covers the 29 km Cloghane to Castlegregory day with time in hand, which is the arithmetic that fails in winter.
12.4°C high · 6.7°C low · 14.0 h (sunrise 06:42, sunset 20:40 local at Dingle)Watch for: Ticks in long grass and bracken.The driest month at Valentia, 94 mm over 13.5 wet days, with nearly 16 hours of light and everything running. It is also the best odds you will get of seeing the Masatiompan crossing rather than walking it in cloud.
14.5°C high · 8.8°C low · 15.8 h (sunrise 05:44, sunset 21:31 local at Dingle)Watch for: Ticks are active. Natterjack toads breed in the dune pools behind the Maharees, the only place in Ireland they occur, and the males call at night in spring, so a Castlegregory stop in May is worth listening for rather than walking through.The fewest wet days of any month at 12.8, and light until after ten at night. On a route whose longest day is 29 km at 7 to 9 hours, that turns the hard stages from a race into a long walk.
16.6°C high · 11.1°C low · 16.8 h (sunrise 05:17, sunset 22:06 local at Dingle)Watch for: Midges in the still, sheltered ground inland, the Emlagh valley above Camp and the Owenmore valley behind Cloghane. Culicoides is much less active above about 10 km/h of wind, and the coastal and beach stages usually have that.Rain climbs back to 117 mm over 16 wet days, more than April, May or June, and the calmest air of the year arrives with the crowds. Nothing is wrong with July here, it is simply the weakest of the summer months.
17.8°C high · 12.9°C low · 16.4 h (sunrise 05:37, sunset 21:58 local at Dingle)Watch for: Midges inland in the evenings, ticks still active, and traffic on the Slea Head road.The warmest month, and as July for rain and crowds. Light has already dropped two hours from June, which starts to matter on the 29 km day.
18°C high · 12.8°C low · 14.7 h (sunrise 06:23, sunset 21:08 local at Dingle)Watch for: Midges inland, and the Slea Head traffic at its heaviest.The crowds go and the route is still fully served. The cost is rain up to 130 mm and light down to 12.7 hours, which still covers the 7 to 9 hour stage but no longer with much spare.
16.9°C high · 11.7°C low · 12.7 h (sunrise 07:14, sunset 19:58 local at Dingle)Watch for: The first autumn depressions, which arrive with big swell onto Brandon Bay and Smerwick.The last month of the supported season, and the weather knows it at 173 mm over 18 wet days. Mornings stay dark until about 08:00 local, because Dingle sits at the far western edge of the time zone, and later still once the clocks go back.
14.4°C high · 9.5°C low · 10.7 h (sunrise 08:05, sunset 18:49 local at Dingle, before the clocks go back late in the month)Watch for: Autumn gales on the high crossing, and the shorter afternoon against the two long north-coast stages.The wettest month at Valentia, 189 mm across 21 wet days, with light down to 8.9 hours against a longest stage of 7 to 9 hours.
11.8°C high · 7.2°C low · 8.9 h (sunrise 07:59, sunset 16:52 local at Dingle)Watch for: Atlantic gales, and big swell onto the north-coast beaches.The shortest light of the year at 7.8 hours, sunrise 08:41 and sunset 16:31. That is less daylight than the trail committee allows for either of the two long north-coast stages, so a December circuit means shorter days and more overnight stops in villages that may have none open.
10.4°C high · 5.8°C low · 7.8 h (sunrise 08:41, sunset 16:31 local at Dingle)Watch for: Light, above everything. Frost is occasional and lying snow rare below the Brandon saddle, so the limits here are darkness, wind and water rather than winter mountain conditions.