The association between mortality and a 1‹C increase in UTCI above the 99th percentile (24.8‹C) was stronger for areas in the lowest NDVI quartile (14.7% higher; 95% CI: 1.9, 17.5%) than for areas in the highest quartile (3.0%; 95% CI: 2.0, 4.0%). In areas > 4 km from water, a 1‹C increase in UTCI above the 99th percentile was associated with a 7.1% increase in mortality only 2.1% (95% CI: 1.2, 3.0%).