Weather in Cartagena in August

Prime time. August is about as good as Cartagena gets. Highs average 30.8 °C, lows 24.1 °C, and rain falls on 2 days — nothing in the month is working against you.

Cartagena barely has seasons. August scores 80 out of 100 against a best of 95 in May — a gap small enough that the month you choose matters far less here than the week you choose. Worth keeping in perspective: August is the weakest month of Cartagena's year and it is still a perfectly good one. The downside here is small.

Rain falls on only 2 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 30.8 °C days and 24.1 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 21 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest August day reached 36.4 °C and the coldest night fell to 19.6 °C, and the wettest single day dropped 28 mm — roughly 233% of the month's rain in one day.

This is the volatile part. August rainfall has ranged from 0 mm to 44 mm across the twenty years measured — a 44 mm spread around an average of 12 mm. The average is real but almost no individual August looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 11 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 66%.

How August sits in the year

Temperatures hold steady either side: 30.4 °C in July, 30.8 here, 28 in September. Nothing about the timing within the month matters much.

Daylight in August

13.7 hours of daylight, losing 1 hours across the month. That is between Cartagena's extremes of 14.7 and 9.6 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 25.7 °C in August — warm enough to stay in as long as you like. This is the warmest the water gets all year.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Cartagena versus nearby

If Cartagena is one option among several, the nearby comparison is worth making. Murcia is the weaker option in August — 4.9 °C warmer, the same number of rain days. Valencia is the weaker option in August — 4.3 °C warmer, 2 days more rain.

So: August works, with May the better month by 15 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Cartagena

See all twelve months in Cartagena, or where else to go in August.