On 15 August the NHC reported that Tropical Storm Grace became a tropical depression again. On 16 August, at 1200 UTC the Government of Jamaica issued a Tropical Storm Watch for Jamaica and at 1500 UTC the same day the Government of the Cayman Islands issued a Tropical Storm Warning for the Cayman Islands. Over 17 and 18 August, Tropical Depression Grace gradually strengthened becoming a tropical storm again as it approached Jamaica and the Cayman Islands, which resulted in heavy rains and gusty winds in both countries.

Trinidad was under the influence of two tropical waves and the presence of the Inter Tropical Convergence Zone resulting in adverse weather conditions that occurred primarily between August 17 and August 20, 2021. During this period, Trinidad was affected by periods of intense rainfall and thunderstorm activity.

Tropical Cyclone (TC) Grace was the seventh tropical cyclone in the 2021 Atlantic Hurricane Season. Reported on 13 August as Potential Tropical Cyclone Seven, it was soon upgraded to Tropical Depression Seven and on 14 August it upgraded to Tropical Storm Grace which was first characterized as a small tropical storm. On the same day at 1500 UTC, it became stronger and resulted in stormy weather with heavy rainfall across the Lesser Antilles. On 15 August at 0300 UTC, a Tropical Storm Watch was issued for the entire coast of Haiti. Later that day, the

Haiti was affected by Tropical Cyclone Grace, which caused adverse weather conditions that occurred between 16 August and 17 August, 2021. During this period, Haiti was affected by intense rainfall.
This event briefing describes the impact of rainfall on Haiti, which was associated with a Covered Area Rainfall Event (CARE), starting on 17 August and ending on 18 August 2021.

A magnitude 5.8 earthquake occurred at 03:20:45 (UTC) on 15 August 2021, 12.8 km (8 mi) NNE of Chardonnière, Haiti; 42.2 km (26.2 mi) WNW of Les Cayes, Haiti and 106.9 km (66.4 mi) W of Miragoâne, Haiti. Estimates from the United States Geological Survey (USGS) located the epicentre of the event at 18.371°N, 74.099°W, and at a depth of 12.0 km.

On 14 August at 0900 UTC, the NHC reported that Tropical Depression Seven was upgraded to Tropical Storm
Grace, at first characterized as a small tropical storm. At 1500 UTC it became stronger and produced tropical-storm-force winds which extended outward up to 35 miles (55 km) from the centre. This configuration resulted in stormy weather with heavy rainfall which spread across the Lesser Antilles, affecting Saint Kitts and Nevis and Montserrat.

Tropical Storm Fred was the sixth tropical cyclone in the 2021 Atlantic Hurricane Season. This tropical disturbance was reported by National Hurricane Center on 9 August and was named Potential Tropical Cyclone Six, strengthening while approaching the Leeward Islands. On 10 August, a Tropical Storm Watch was issued for northern Haiti. On 11 August Potential Tropical Cyclone Six was upgraded to Tropical Storm Fred while passing over the Dominican Republic.

A magnitude 7.2 earthquake occurred at 12:29:08 (UTC) on 14 August 2021, 13.5 km (8.4 mi) SSE of Petit Trou de Nippes, Haiti; 37.3 km (23.2 mi) NE of Les Cayes, Haiti and 40.9 km (25.4 mi) W of Miragoâne, Haiti. Estimates from the United States Geological Survey (USGS) located the epicentre of the event at 18.408°N, 73.480°W, and at a depth of 10.0 km.

On 15 August at 0300 UTC, a Tropical Storm Watch was issued for the entire coast of Haiti. Later that day, the US National Hurricane Center (NHC) reported that Tropical Storm Grace became a tropical depression again. On 16 August, with the centre located about 80 km (49.7 mi) south of Port-au-Prince, Haiti, this tropical depression brought heavy rainfall over the southern parts of Haiti, which continued to persist during the next day, when the Tropical Storm Watch for Haiti was discontinued.