Say climate — normals and trends
Say (Niger) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 28.6 °C and it receives 399 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 May (33.4 °C on average) and the coldest is January (23.9 °C). Rainfall peaks in August.
Say averages 0 frost days, 333 hot days (≥ 30 °C) and 63 rainy days per year.
Say has warmed by +2.2 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The hottest day of the period reached 45.2 °C (on 24 April 2024) and the coldest 9.2 °C (on 14 January 1957).
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
SayTillabéri Region
- coords
- 13.10°, 2.37°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
28.6°C
Average daily high
35.2°C
Average daily low
22.7°C
Annual rainfall
399mm
Sunshine / day
11.0h
Mean relative humidity
43%
Average peak wind
15.1km/h
Seasonal range
9.5°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
333 d/yr
Rainy days (≥ 1 mm)
63 d/yr
Annual snowfall
0.0 cm
Average feels-like high
36.5 °C
Average feels-like low
22.5 °C
Average peak gust
32.6 km/h
Tropical nights (≥ 20 °C)
265 d/yr
Solar radiation
22.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.63 · 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
45.2 °C
24 April 2024
Coldest day
9.2 °C
14 January 1957
Wettest day
146 mm
26 August 2015
Windiest day
32.9 km/h
27 April 2014
Strongest gust
64.1 km/h
13 June 2002
Hottest feels-like
48.3 °C
27 May 1998
Coldest feels-like
5.1 °C
13 January 1957
Sunniest day
12.1 h
3 June 1942
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 | 33.3 °C | +1.6 °C | 0 mm | -0 mm |
| Feb | 35.7 °C | +1.1 °C | 0 mm | -0 mm |
| Mar | 41.6 °C | +3.5 °C | 0 mm | -2 mm |
| Apr | 42.1 °C | +2.0 °C | 0 mm | -5 mm |
| May | 40.9 °C | +1.5 °C | 7 mm | -11 mm |
| Jun | 37.2 °C | +0.6 °C | 20 mm | -15 mm |
| Jul | 32.6 °C | -0.5 °C | 86 mm | -11 mm |
| Aug | 31.1 °C | -0.1 °C | 179 mm | +21 mm |
| Sep | 33.1 °C | +0.2 °C | 60 mm | -9 mm |
| Oct | 37.1 °C | +0.7 °C | 4 mm | -9 mm |
| Nov | 37.1 °C | +1.4 °C | 0 mm | -0 mm |
| Dec | 35.2 °C | +2.6 °C | 0 mm | -0 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 Say?
Say has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 28.6 °C and it receives 399 mm of precipitation per year.
What is the hottest day ever recorded in Say?
The hottest day measured in Say between 1940 and 2025 was 24 April 2024, reaching 45.2 °C.
What is the coldest day in Say?
The coldest day measured in Say between 1940 and 2025 was 14 January 1957, at 9.2 °C.
Does it snow in Say?
Almost never: Say sees virtually no snow, with about 0 frost days per year.
Has the climate of Say warmed?
Yes: Say warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Say?
The wettest day measured in Say between 1940 and 2025 was 26 August 2015, with 146 mm of rain in 24 hours.
What was the windiest day in Say?
The windiest day measured in Say between 1940 and 2025 was 27 April 2014, with winds reaching 32.9 km/h.
What is the warmest month in Say?
The warmest month in Say is May (33.4 °C on average); the coldest is January (23.9 °C).
How much does it rain in Say?
Say receives on average 399 mm of precipitation per year, spread over about 63 rainy days.
Is it sunny in Say?
Say gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
Are there tropical nights in Say?
Yes: Say has on average 265 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Say?
In Say, between 1940 and 2025, the highest apparent temperature reached 48.3 °C on 27 May 1998, and the lowest was 5.1 °C on 13 January 1957.
Compare Say with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Say