Climate averages 1991–2020
Lisbon weather
in May.
A mild, moderately wet month: the 6th warmest and the 5th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Lisbon: daytime highs average 20.5°C and nights cool to about 14.3°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 42 mm of rain on roughly 6 days, which makes May a moderately wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 16 min on an average May day.
The nearest other city in this atlas is Amadora (8 km away). In May its highs average 20.2°C, about as warm as Lisbon, with 42 mm of rain.
Among the 12 cities listed in Portugal, Lisbon ranks 6th of 12 for the warmest May highs and joint 4th of 12 for the driest May (rainfall, lowest first). The mean May high of those 12 cities is 20.6°C; Lisbon is 0.1°C cooler than that mean.
From May to June, average highs rise by 3.1°C to 23.6°C, and monthly rainfall falls from 42 mm to 9.9 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Lisbon climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 13.4°C9.1°C | 9.1°C | 68 | 8.9 | 9.810 h |
| February | 14.2°C9.2°C | 9.2°C | 52 | 7.6 | 10.711 h |
| March | 16.4°C10.8°C | 10.8°C | 53 | 8.1 | 11.912 h |
| April | 17.9°C12.2°C | 12.2°C | 51 | 8.4 | 13.213 h |
| May, selected | 20.5°C14.3°C | 14.3°C | 42 | 5.9 | 14.314 h |
| June | 23.6°C16.6°C | 16.6°C | 9.9 | 2.1 | 14.815 h |
| July | 25.7°C18.0°C | 18.0°C | 2.0 | 0.6 | 14.615 h |
| August | 26.3°C18.6°C | 18.6°C | 4.1 | 1.0 | 13.714 h |
| September | 24.4°C17.8°C | 17.8°C | 29 | 4.1 | 12.512 h |
| October | 20.9°C15.7°C | 15.7°C | 77 | 8.9 | 11.211 h |
| November | 16.7°C12.4°C | 12.4°C | 82 | 10.2 | 10.110 h |
| December | 14.3°C10.2°C | 10.2°C | 79 | 9.3 | 9.510 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Amadora in MayPortugal · 8 kmHigh 20.2°C · Low 13.6°C · 42 mm rain
- Queluz in MayPortugal · 10 kmHigh 19.2°C · Low 14.1°C · 42 mm rain
- Setúbal in MayPortugal · 32 kmHigh 22.3°C · Low 13.6°C · 35 mm rain
- Leiria in MayPortugal · 117 kmHigh 21.4°C · Low 12.7°C · 63 mm rain
- Coimbra in MayPortugal · 176 kmHigh 22.0°C · Low 11.5°C · 73 mm rain
- Badajoz in MaySpain · 190 kmHigh 24.8°C · Low 12.9°C · 37 mm rain
- Aveiro in MayPortugal · 218 kmHigh 21.2°C · Low 12.7°C · 79 mm rain
- Faro in MayPortugal · 218 kmHigh 20.7°C · Low 15.5°C · 24 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Lisbon) is explained once on the Lisbon year overview and on the Sources, method and limits page.
Amadora and Queluz lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.