What the averages say
The mean annual temperature is 19.2 °C. The warmest month is August, averaging 27.0 °C with highs around 30.4 °C; the coldest is January, averaging 12.7 °C with lows of 8.9 °C. The 22 degrees between the mean high of August and the mean low of January are the real measure of how continental this climate is.
Heat, cold and extremes
On average, 41 days a year reach 30 °C or more and 0 bring frost. Neither heat nor cold dominates the year. The highest reading in the series is 38.3 °C, set in July, and the lowest 1.3 °C, in January.
Rain, sun and wind
260 mm fall each year over 55 days with measurable rain, an amount all but absent in summer: September is the wettest month with 39 mm and July the driest with 1 mm. The sky is clear on — days a year. Mean wind speed is around 7 km/h and mean annual relative humidity 70 %.
Month by month
AEMET climate normals 1991-2020. Cartagena observatory, 0.5 km from the centre at 17 m above sea level.| Monthly mean | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
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| Mean temperature | 12.7 | 13.3 | 15.1 | 17.0 | 20.1 | 23.6 | 26.4 | 27.0 | 24.3 | 20.6 | 16.4 | 13.7 |
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| Mean high | 16.6 | 17.0 | 18.7 | 20.4 | 23.5 | 27.0 | 29.8 | 30.4 | 27.5 | 23.9 | 20.0 | 17.5 |
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| Mean low | 8.9 | 9.7 | 11.4 | 13.6 | 16.7 | 20.2 | 23.0 | 23.7 | 21.0 | 17.2 | 12.8 | 9.9 |
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| Rainfall (mm) | 31 | 21 | 25 | 24 | 14 | 5 | 1 | 3 | 39 | 30 | 36 | 31 |
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| Rain days | 6.0 | 5.1 | 6.0 | 5.3 | 3.9 | 2.0 | 0.7 | 2.1 | 4.4 | 5.6 | 7.2 | 6.4 |
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| Days ≥ 30 °C | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 4.0 | 14.7 | 16.9 | 4.3 | 0.2 | 0.0 | 0.0 |
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| Frost days | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
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Where this data comes from
These are the 1991-2020 climate normals published by AEMET, the Spanish state meteorological agency, for the Cartagena observatory — the nearest official station with a complete series to Cartagena today. A normal is not a forecast: it describes a thirty-year average, and any given day can depart from it widely. For tomorrow, use the forecast at the top of this page.
