Lousã climate — normals and trends
Lousã (Portugal) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 14.0 °C and it receives 1,084 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (20.9 °C on average) and the coldest is January (7.6 °C). Rainfall peaks in December.
Lousã averages 9 frost days, 26 hot days (≥ 30 °C) and 112 rainy days per year.
Lousã has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The number of frost days there went from about 15 to 3 per year over the period.
The hottest day of the period reached 40.8 °C (on 1 August 2003) and the coldest -7.6 °C (on 15 January 1980).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
LousãCoimbra District
- coords
- 40.12°, -8.25°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.0°C
Average daily high
19.0°C
Average daily low
9.5°C
Annual rainfall
1,084mm
Sunshine / day
9.9h
Mean relative humidity
76%
Average peak wind
16.4km/h
Seasonal range
13.3°C
Frost days (< 0 °C)
9 d/yr
Hot days (≥ 30 °C)
26 d/yr
Rainy days (≥ 1 mm)
112 d/yr
Annual snowfall
0.9 cm
Average feels-like high
18.0 °C
Average feels-like low
7.8 °C
Average peak gust
39.2 km/h
Tropical nights (≥ 20 °C)
4 d/yr
Solar radiation
16.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.24 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
40.8 °C
1 August 2003
Coldest day
-7.6 °C
15 January 1980
Wettest day
97 mm
20 January 1941
Windiest day
50.8 km/h
27 February 2010
Strongest gust
135.0 km/h
30 December 1981
Hottest feels-like
41.8 °C
1 August 2003
Coldest feels-like
-11.7 °C
15 January 1980
Snowiest day
21.3 cm
23 February 1956
Sunniest day
14.9 h
18 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 13.5 °C | +1.9 °C | 275 mm | +140 mm |
| Feb | 14.5 °C | +1.6 °C | 59 mm | -66 mm |
| Mar | 15.0 °C | -0.4 °C | 227 mm | +109 mm |
| Apr | 18.3 °C | +1.0 °C | 172 mm | +69 mm |
| May | 21.6 °C | +1.5 °C | 67 mm | -23 mm |
| Jun | 28.0 °C | +3.9 °C | 10 mm | -32 mm |
| Jul | 29.7 °C | +2.4 °C | 6 mm | -8 mm |
| Aug | 30.3 °C | +2.7 °C | 2 mm | -14 mm |
| Sep | 24.9 °C | -0.1 °C | 45 mm | -11 mm |
| Oct | 23.0 °C | +2.8 °C | 122 mm | +4 mm |
| Nov | 15.1 °C | +0.2 °C | 292 mm | +162 mm |
| Dec | 12.4 °C | +0.3 °C | 151 mm | +13 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Lousã?
Lousã has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 14.0 °C and it receives 1,084 mm of precipitation per year.
What is the hottest day ever recorded in Lousã?
The hottest day measured in Lousã between 1940 and 2025 was 1 August 2003, reaching 40.8 °C.
What is the coldest day in Lousã?
The coldest day measured in Lousã between 1940 and 2025 was 15 January 1980, at -7.6 °C.
Does it snow in Lousã?
Almost never: Lousã sees virtually no snow, with about 9 frost days per year.
Has the climate of Lousã warmed?
Yes: Lousã warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Lousã?
The wettest day measured in Lousã between 1940 and 2025 was 20 January 1941, with 97 mm of rain in 24 hours.
What was the windiest day in Lousã?
The windiest day measured in Lousã between 1940 and 2025 was 27 February 2010, with winds reaching 50.8 km/h.
What is the warmest month in Lousã?
The warmest month in Lousã is August (20.9 °C on average); the coldest is January (7.6 °C).
How much does it rain in Lousã?
Lousã receives on average 1,084 mm of precipitation per year, spread over about 112 rainy days.
Is it sunny in Lousã?
Lousã gets on average 9.9 hours of sunshine per day, roughly 3,614 hours per year over 1940-2025.
What is the biggest single-day snowfall in Lousã?
The heaviest 24-hour snowfall measured in Lousã between 1940 and 2025 was 23 February 1956, with 21.3 cm.
Are there tropical nights in Lousã?
Yes: Lousã has on average 4 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Lousã?
In Lousã, between 1940 and 2025, the highest apparent temperature reached 41.8 °C on 1 August 2003, and the lowest was -11.7 °C on 15 January 1980.
Compare Lousã with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Lousã