Nisa climate — normals and trends
Nisa (Portugal) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 15.8 °C and it receives 691 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 July (24.1 °C on average) and the coldest is January (8.4 °C). Rainfall peaks in December.
Nisa averages 4 frost days, 64 hot days (≥ 30 °C) and 86 rainy days per year.
Nisa 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 7 to 1 per year over the period.
The hottest day of the period reached 43.9 °C (on 1 August 2003) and the coldest -5.5 °C (on 22 December 1978).
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
NisaPortalegre District
- coords
- 39.51°, -7.65°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.8°C
Average daily high
21.1°C
Average daily low
10.9°C
Annual rainfall
691mm
Sunshine / day
10.1h
Mean relative humidity
68%
Average peak wind
16.7km/h
Seasonal range
15.7°C
Frost days (< 0 °C)
4 d/yr
Hot days (≥ 30 °C)
64 d/yr
Rainy days (≥ 1 mm)
86 d/yr
Annual snowfall
0.5 cm
Average feels-like high
19.8 °C
Average feels-like low
9.2 °C
Average peak gust
34.9 km/h
Tropical nights (≥ 20 °C)
17 d/yr
Solar radiation
16.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.21 · 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
43.9 °C
1 August 2003
Coldest day
-5.5 °C
22 December 1978
Wettest day
80 mm
20 January 1941
Windiest day
50.2 km/h
30 December 1981
Strongest gust
119.2 km/h
30 December 1981
Hottest feels-like
44.1 °C
1 August 2003
Coldest feels-like
-9.4 °C
1 March 2005
Snowiest day
11.8 cm
3 January 1971
Sunniest day
14.8 h
13 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 | 14.4 °C | +2.0 °C | 185 mm | +99 mm |
| Feb | 15.7 °C | +1.7 °C | 52 mm | -29 mm |
| Mar | 16.0 °C | -0.8 °C | 183 mm | +106 mm |
| Apr | 19.8 °C | +0.8 °C | 111 mm | +47 mm |
| May | 24.6 °C | +2.0 °C | 37 mm | -17 mm |
| Jun | 32.4 °C | +4.8 °C | 9 mm | -14 mm |
| Jul | 33.6 °C | +2.1 °C | 3 mm | -4 mm |
| Aug | 34.6 °C | +3.2 °C | 2 mm | -6 mm |
| Sep | 28.2 °C | +0.6 °C | 27 mm | -8 mm |
| Oct | 25.2 °C | +3.4 °C | 63 mm | -15 mm |
| Nov | 16.2 °C | +0.1 °C | 157 mm | +69 mm |
| Dec | 13.2 °C | +0.3 °C | 129 mm | +36 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 Nisa?
Nisa has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 15.8 °C and it receives 691 mm of precipitation per year.
What is the hottest day ever recorded in Nisa?
The hottest day measured in Nisa between 1940 and 2025 was 1 August 2003, reaching 43.9 °C.
What is the coldest day in Nisa?
The coldest day measured in Nisa between 1940 and 2025 was 22 December 1978, at -5.5 °C.
Does it snow in Nisa?
Almost never: Nisa sees virtually no snow, with about 4 frost days per year.
Has the climate of Nisa warmed?
Yes: Nisa warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Nisa?
The wettest day measured in Nisa between 1940 and 2025 was 20 January 1941, with 80 mm of rain in 24 hours.
What was the windiest day in Nisa?
The windiest day measured in Nisa between 1940 and 2025 was 30 December 1981, with winds reaching 50.2 km/h.
What is the warmest month in Nisa?
The warmest month in Nisa is July (24.1 °C on average); the coldest is January (8.4 °C).
How much does it rain in Nisa?
Nisa receives on average 691 mm of precipitation per year, spread over about 86 rainy days.
Is it sunny in Nisa?
Nisa gets on average 10.1 hours of sunshine per day, roughly 3,687 hours per year over 1940-2025.
What is the biggest single-day snowfall in Nisa?
The heaviest 24-hour snowfall measured in Nisa between 1940 and 2025 was 3 January 1971, with 11.8 cm.
Are there tropical nights in Nisa?
Yes: Nisa has on average 17 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Nisa?
In Nisa, between 1940 and 2025, the highest apparent temperature reached 44.1 °C on 1 August 2003, and the lowest was -9.4 °C on 1 March 2005.
Compare Nisa with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Nisa