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Roseau month by month
The figures come from Canefield airport, beside the capital, for the 1982-2011 period: around 1,760 mm a year and highs always between 29.5 and 31.8 °C.
01 An island that manufactures rain
Dominica is mountainous and narrow, and that relief forces humid Atlantic air to rise and unload. The result, even on the leeward coast where the capital sits, is around 1,760 mm a year according to Canefield data for 1982-2011.
One thing is worth understanding: that figure is the coastal one. The island’s interior, with its mountains and cloud forest, receives considerably more. In other words, the capital’s figure is the country’s minimum, not the average of what you will find once you leave it.
02 The three-month window
The dry season concentrates in February, March and April: about 62, 49 and 55 mm respectively. Compared with September’s 254 mm, it is practically another country. January and December fall in between, at around 108 and 102 mm.
Temperature, by contrast, barely takes part: highs run from 29.5 °C in January and February to 31.8 °C in May, June and August, and lows move between 21.6 and 24.5 °C. Nobody picks dates by the thermometer here.
03 The season to respect
The Atlantic hurricane season runs from 1 June to 30 November, with the most active stretch between August and October. Dominica sits on the Lesser Antilles arc, in the front line of systems crossing the ocean.
This is not theory. In September 2017 Hurricane Maria struck the island and caused widespread damage to housing and infrastructure, the capital included. Recovery has been carried out with resilience in mind, and that memory is very present in the country. Travelling in those months requires insurance, slack and attention to advisories.
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Key moments at a glance
Between 49 and 62 mm a month and trails in good condition.
About 100 mm a month and cyclone season already closed.
Rain increases and the season begins on 1 June.
Almost 950 mm across the four months and peak cyclone risk.
04 Verdict
Go between February and April. It is the only stretch in which the island’s interior — the reason to come to Dominica — is reliably accessible: firm trails, manageable river levels and fewer lost days.
December and January work well as an alternative, already outside cyclone season. From July to October the trip is possible but demands total flexibility: they are the wettest and riskiest months, and many excursions depend on the state of the ground that very day.
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