The short answer: mid-December to mid-April for the best weather and the highest prices, May and early June for the best balance of the two, and August to October for the lowest prices and the highest hurricane risk.
Antigua is one of the drier islands in the Eastern Caribbean — it lacks the high mountains that wring rain out of the trade winds, which is why the interior is scrub rather than forest. Daytime highs sit between 27 °C and 31 °C all year and the sea rarely drops below 26 °C, so there is no month you cannot swim.
Antigua month by month
Averages for St John’s. Rainfall is monthly total; crowd level reflects hotel occupancy and cruise arrivals.
| Month | Avg high | Rainfall | Crowds | What to expect |
|---|---|---|---|---|
| January | 28 °C | 65 mm | Peak | Dry, breezy and reliably sunny. Peak prices and busy beaches. |
| February | 28 °C | 45 mm | Peak | The driest month and arguably the best weather of the year. |
| March | 29 °C | 45 mm | Peak | Still dry and sunny; sargassum can begin on the east coast. |
| April | 29 °C | 65 mm | Busy | Sailing Week fills English Harbour from the end of the month. |
| May | 30 °C | 90 mm | Moderate | Prices drop sharply, weather still excellent. The value sweet spot. |
| June | 30 °C | 90 mm | Moderate | Hurricane season opens but risk is low. Quiet and warm. |
| July | 30 °C | 105 mm | Moderate | Hot and humid; Carnival builds towards the end of the month. |
| August | 31 °C | 120 mm | Low | Carnival week, then the quietest and cheapest stretch begins. |
| September | 31 °C | 135 mm | Low | Peak hurricane risk and lowest prices. Some places close. |
| October | 30 °C | 145 mm | Low | Wettest month. Short heavy showers rather than all-day rain. |
| November | 29 °C | 110 mm | Moderate | Season ends 30 November; Independence Day on the 1st. |
| December | 28 °C | 90 mm | Busy | Dries out fast; high season and premium rates from mid-month. |
High season: mid-December to mid-April
This is why people come. Rainfall drops to almost nothing, the trade winds keep the humidity down, and day after day looks the same: 28 °C, blue, breezy. It is also when every hotel charges its highest rate, when Christmas and New Year carry minimum-stay requirements, and when the cruise ships are thickest in St John’s.
If you want guaranteed weather and do not mind paying for it, book February. If you want the same weather with fewer people, aim for the first half of December or the second half of April.
Shoulder season: May to June
The best value on the calendar. Rates fall 30–40% from mid-April, the weather is still excellent, the sea is at its warmest and the island is noticeably quieter. Showers become more frequent but are usually short, heavy and gone.
Hurricane season technically opens on 1 June, but June has historically been one of the lowest-risk months of the whole season. For most travellers, late May and early June are the sweet spot.
Hurricane season: the honest version
The Atlantic hurricane season runs from 1 June to 30 November, with the real risk concentrated in August, September and October. Antigua is not hit every year — far from it — but it has been hit hard: Hurricane Irma passed directly over Barbuda in September 2017 and damaged or destroyed almost every building on the island.
What this means in practice: prices in September and October are the lowest of the year and some restaurants and small hotels close entirely. If you travel then, take comprehensive travel insurance that covers hurricane disruption, book accommodation with free cancellation, and watch the forecast in the week before you fly. Most trips in this window are completely fine — but it is a genuine gamble, and it should be a priced-in one.
When to go for a specific thing
For the Shirley Heights party: any Sunday, year-round. For sailing: Antigua Sailing Week at the end of April, or the Charter Yacht Show in early December. For Carnival: the last week of July into the first Tuesday of August. For the calmest sea and best snorkelling visibility: February to May. For the lowest prices: September.