Singapore is hot and humid, they will have no problem swimming up there if they have guts of the heights.
F and C for annual averages.
Monthly averages
°F | °C
January Avg low: 24° Avg hi: 30° Avg precip: 19.74 cm
February Avg low: 24° Avg hi: 31° Avg precip: 8.21 cm
March Avg low: 25° Avg hi: 32° Avg precip: 12.74 cm
April Avg low: 25° Avg hi: 32° Avg precip: 12.65 cm
May Avg low: 26° Avg hi: 32° Avg precip: 13.73 cm
June Avg low: 26° Avg hi: 32° Avg precip: 10.19 cm
July Avg low: 25° Avg hi: 31° Avg precip: 13.04 cm
August Avg low: 25° Avg hi: 31° Avg precip: 11.34 cm
September Avg low: 25° Avg hi: 31° Avg precip: 12.67 cm
October Avg low: 25° Avg hi: 31° Avg precip: 12.24 cm
November Avg low: 24° Avg hi: 31° Avg precip: 20.81 cm
December Avg low: 24° Avg hi: 30° Avg precip: 22.55 cm
Monthly averages
°F | °C
January Avg low: 76° Avg hi: 86° Avg precip: 7.77 in
February Avg low: 76° Avg hi: 88° Avg precip: 3.23 in
March Avg low: 77° Avg hi: 89° Avg precip: 5.02 in
April Avg low: 78° Avg hi: 90° Avg precip: 4.98 in
May Avg low: 78° Avg hi: 89° Avg precip: 5.41 in
June Avg low: 78° Avg hi: 89° Avg precip: 4.01 in
July Avg low: 78° Avg hi: 88° Avg precip: 5.13 in
August Avg low: 78° Avg hi: 88° Avg precip: 4.46 in
September Avg low: 77° Avg hi: 88° Avg precip: 4.99 in
October Avg low: 77° Avg hi: 89° Avg precip: 4.82 in
November Avg low: 76° Avg hi: 87° Avg precip: 8.19 in
December Avg low: 75° Avg hi: 86° Avg precip: 8.88 in