Isiolo climate — normals and trends

Q: What is the climate of Isiolo?

Isiolo has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 19.7 °C and it receives 672 mm of precipitation per year.

Q: What is the hottest day ever recorded in Isiolo?

The hottest day measured in Isiolo between 1940 and 2025 was 9 April 2019, reaching 31.6 °C.

Q: What is the coldest day in Isiolo?

The coldest day measured in Isiolo between 1940 and 2025 was 15 January 1968, at 8.9 °C.

Q: Does it snow in Isiolo?

Almost never: Isiolo sees virtually no snow, with about 0 frost days per year.

Q: Has the climate of Isiolo warmed?

Yes: Isiolo warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Isiolo?

The wettest day measured in Isiolo between 1940 and 2025 was 4 May 2024, with 106 mm of rain in 24 hours.

Q: What was the windiest day in Isiolo?

The windiest day measured in Isiolo between 1940 and 2025 was 28 September 1963, with winds reaching 22.4 km/h.

Q: What is the warmest month in Isiolo?

The warmest month in Isiolo is March (20.7 °C on average); the coldest is July (18.7 °C).

Q: How much does it rain in Isiolo?

Isiolo receives on average 672 mm of precipitation per year, spread over about 134 rainy days.

Q: Is it sunny in Isiolo?

Isiolo gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.

Isiolo (Kenya) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 19.7 °C and it receives 672 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 March (20.7 °C on average) and the coldest is July (18.7 °C). Rainfall peaks in November.

Isiolo averages 0 frost days, 1 hot days (≥ 30 °C) and 134 rainy days per year.

Isiolo has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.

The hottest day of the period reached 31.6 °C (on 9 April 2019) and the coldest 8.9 °C (on 15 January 1968).

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

IsioloIsiolo County

coords: 0.35°, 37.58°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthMarchColdest monthJulyWettest monthNovemberDriest monthFebruary

Mean daily temperature

19.7°C

Average daily high

25.2°C

Average daily low

15.1°C

Annual rainfall

672mm

Sunshine / day

11.2h

Mean relative humidity

65%

Average peak wind

13.0km/h

Seasonal range

2.0°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

1 d/yr

Rainy days (≥ 1 mm)

134 d/yr

Annual snowfall

0.0 cm

Average feels-like high

26.0 °C

Average feels-like low

14.9 °C

Average peak gust

35.4 km/h

Tropical nights (≥ 20 °C)

0 d/yr

Solar radiation

21.7 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.7 °C

since 1940

+0.2 °C per decade · r² = 0.69 · p = < 0.001

19402025

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

31.6 °C

9 April 2019

Coldest day

8.9 °C

15 January 1968

Wettest day

106 mm

4 May 2024

Windiest day

22.4 km/h

28 September 1963

Strongest gust

66.6 km/h

2 November 1994

Hottest feels-like

32.4 °C

18 March 1959

Coldest feels-like

5.3 °C

2 January 2012

Sunniest day

12.0 h

9 April 1944

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	30.7 °C14 March 2025	12.0 °C7 January 2025	20.6 °C	706 mm	6
2024	31.1 °C17 March 2024	12.9 °C28 June 2024	20.7 °C	1,052 mm	6
2023	29.5 °C8 March 2023	12.3 °C8 December 2023	20.4 °C	501 mm	0
2022	30.7 °C23 March 2022	12.5 °C14 January 2022	20.5 °C	246 mm	6
2021	29.7 °C29 September 2021	13.2 °C27 January 2021	20.6 °C	444 mm	0
2020	30.1 °C1 March 2020	13.0 °C11 February 2020	20.6 °C	712 mm	2
2019	31.6 °C9 April 2019	11.6 °C19 December 2019	21.0 °C	674 mm	13
2018	28.9 °C25 February 2018	10.6 °C9 February 2018	20.0 °C	878 mm	0
2017	30.4 °C20 March 2017	12.1 °C11 January 2017	20.7 °C	509 mm	3
2016	30.4 °C29 March 2016	12.1 °C6 December 2016	20.3 °C	630 mm	3
2015	30.1 °C13 February 2015	11.8 °C1 January 2015	20.7 °C	666 mm	1
2014	30.1 °C4 March 2014	12.1 °C25 January 2014	20.3 °C	504 mm	1
2013	30.1 °C11 March 2013	11.7 °C5 July 2013	20.1 °C	743 mm	1
2012	29.6 °C16 March 2012	8.9 °C2 January 2012	20.0 °C	710 mm	0
2011	30.6 °C11 February 2011	11.7 °C7 February 2011	20.3 °C	757 mm	1
2010	29.7 °C22 May 2010	13.1 °C5 August 2010	20.4 °C	554 mm	0
2009	29.9 °C22 March 2009	11.9 °C11 January 2009	20.5 °C	275 mm	0
2008	29.2 °C18 March 2008	12.5 °C8 January 2008	20.2 °C	440 mm	0
2007	30.2 °C23 February 2007	12.4 °C16 December 2007	20.3 °C	512 mm	1
2006	30.6 °C18 February 2006	12.8 °C28 January 2006	20.5 °C	598 mm	1
2005	30.2 °C3 April 2005	9.9 °C3 January 2005	20.2 °C	512 mm	2
2004	29.7 °C25 March 2004	12.0 °C5 July 2004	20.0 °C	620 mm	0
2003	30.2 °C23 February 2003	10.2 °C14 January 2003	20.1 °C	551 mm	2
2002	29.3 °C29 March 2002	12.5 °C8 July 2002	20.0 °C	454 mm	0
2001	29.6 °C4 March 2001	11.9 °C24 June 2001	19.8 °C	628 mm	0
2000	29.8 °C10 March 2000	10.7 °C28 January 2000	20.1 °C	238 mm	0
1999	29.6 °C21 May 1999	11.8 °C13 December 1999	19.8 °C	359 mm	0
1998	30.2 °C31 March 1998	12.4 °C3 December 1998	19.8 °C	775 mm	1
1997	30.8 °C7 March 1997	12.9 °C4 March 1997	20.1 °C	694 mm	1
1996	30.2 °C22 February 1996	12.2 °C4 August 1996	19.8 °C	595 mm	1
1995	29.4 °C1 March 1995	11.7 °C20 January 1995	19.9 °C	430 mm	0
1994	29.9 °C8 March 1994	11.6 °C20 January 1994	19.8 °C	587 mm	0
1993	29.1 °C10 April 1993	11.5 °C21 February 1993	19.2 °C	568 mm	0
1992	31.0 °C28 March 1992	11.8 °C21 November 1992	19.5 °C	418 mm	3
1991	30.8 °C23 March 1991	11.7 °C22 January 1991	19.5 °C	471 mm	4
1990	28.7 °C6 February 1990	11.3 °C27 June 1990	19.4 °C	633 mm	0
1989	29.0 °C3 March 1989	11.4 °C1 July 1989	19.2 °C	612 mm	0
1988	31.4 °C23 March 1988	11.2 °C13 December 1988	19.8 °C	776 mm	3
1987	31.3 °C5 March 1987	10.2 °C1 February 1987	20.2 °C	578 mm	2
1986	30.7 °C14 March 1986	11.3 °C26 September 1986	19.5 °C	787 mm	2
1985	30.8 °C16 February 1985	10.7 °C6 August 1985	19.5 °C	543 mm	1
1984	30.3 °C8 April 1984	10.9 °C18 December 1984	19.7 °C	328 mm	2
1983	30.2 °C23 March 1983	10.3 °C10 January 1983	20.0 °C	722 mm	2
1982	30.7 °C27 March 1982	11.4 °C31 December 1982	19.6 °C	594 mm	3
1981	30.5 °C27 February 1981	10.3 °C12 December 1981	19.5 °C	750 mm	1
1980	31.3 °C10 March 1980	10.1 °C17 February 1980	19.9 °C	420 mm	3
1979	29.0 °C4 March 1979	11.4 °C2 March 1979	19.2 °C	701 mm	0
1978	28.5 °C20 March 1978	9.7 °C4 February 1978	18.9 °C	715 mm	0
1977	28.6 °C1 October 1977	10.6 °C26 August 1977	19.1 °C	1,196 mm	0
1976	29.4 °C5 April 1976	10.6 °C19 August 1976	19.2 °C	627 mm	0
1975	29.8 °C12 March 1975	10.6 °C17 December 1975	19.2 °C	602 mm	0
1974	29.5 °C27 February 1974	11.5 °C20 July 1974	19.3 °C	613 mm	0
1973	30.7 °C17 March 1973	11.2 °C11 December 1973	20.0 °C	667 mm	4
1972	29.9 °C4 April 1972	11.5 °C28 July 1972	19.7 °C	524 mm	0
1971	29.8 °C13 February 1971	11.0 °C13 February 1971	19.3 °C	625 mm	0
1970	29.7 °C26 February 1970	11.1 °C18 September 1970	19.4 °C	679 mm	0
1969	30.2 °C19 March 1969	10.6 °C6 February 1969	19.3 °C	466 mm	1
1968	29.8 °C29 January 1968	8.9 °C15 January 1968	18.8 °C	760 mm	0
1967	30.9 °C24 March 1967	10.4 °C9 December 1967	19.3 °C	906 mm	4
1966	29.7 °C15 February 1966	11.1 °C24 December 1966	19.9 °C	500 mm	0
1965	29.7 °C3 April 1965	10.5 °C16 February 1965	19.4 °C	443 mm	0
1964	29.1 °C28 February 1964	9.8 °C31 August 1964	18.9 °C	693 mm	0
1963	28.2 °C31 March 1963	10.4 °C28 July 1963	19.0 °C	960 mm	0
1962	27.7 °C25 February 1962	11.4 °C21 January 1962	19.0 °C	659 mm	0
1961	30.0 °C19 May 1961	9.2 °C5 January 1961	19.7 °C	688 mm	1
1960	29.5 °C22 February 1960	9.7 °C20 January 1960	19.5 °C	515 mm	0
1959	31.1 °C18 March 1959	11.1 °C5 January 1959	19.6 °C	776 mm	4
1958	28.9 °C14 March 1958	9.8 °C6 January 1958	19.1 °C	896 mm	0
1957	28.1 °C15 March 1957	10.4 °C15 February 1957	19.0 °C	917 mm	0
1956	28.7 °C23 September 1956	11.7 °C10 July 1956	19.1 °C	722 mm	0
1955	28.3 °C7 March 1955	12.0 °C18 November 1955	19.0 °C	874 mm	0
1954	28.5 °C16 March 1954	10.4 °C7 January 1954	18.6 °C	1,255 mm	0
1953	27.7 °C6 October 1953	11.4 °C12 August 1953	18.4 °C	1,143 mm	0
1952	27.9 °C14 September 1952	11.3 °C1 September 1952	18.7 °C	893 mm	0
1951	27.6 °C28 February 1951	11.4 °C3 July 1951	18.7 °C	1,282 mm	0
1950	28.5 °C13 March 1950	11.2 °C2 June 1950	18.5 °C	1,235 mm	0
1949	29.7 °C8 February 1949	12.3 °C4 January 1949	19.4 °C	921 mm	0
1948	28.4 °C24 September 1948	10.0 °C2 January 1948	19.1 °C	711 mm	0
1947	27.6 °C6 October 1947	11.8 °C19 September 1947	18.8 °C	1,082 mm	0
1946	30.7 °C28 February 1946	11.6 °C22 September 1946	19.8 °C	500 mm	5
1945	28.5 °C23 February 1945	11.3 °C2 January 1945	19.3 °C	531 mm	0
1944	30.0 °C20 February 1944	11.3 °C6 July 1944	19.6 °C	491 mm	1
1943	29.0 °C1 March 1943	11.5 °C25 November 1943	19.1 °C	809 mm	0
1942	28.9 °C1 October 1942	10.6 °C4 August 1942	19.3 °C	524 mm	0
1941	30.1 °C27 March 1941	10.5 °C9 December 1941	19.2 °C	819 mm	1
1940	27.6 °C17 October 1940	10.9 °C29 November 1940	19.0 °C	1,136 mm	0

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?

Year

Across the whole year

Average daily high

26.4 °C

+1.2 °C

Hot days (≥ 30 °C)

6 d/yr

Frost days (< 0 °C)

0 d/yr

Annual rainfall

706 mm

+34 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	26.7 °C	+1.4 °C	49 mm	+9 mm
Feb	28.0 °C	+1.5 °C	4 mm	-28 mm
Mar	27.4 °C	+0.7 °C	95 mm	+42 mm
Apr	26.6 °C	+0.8 °C	118 mm	+19 mm
May	27.2 °C	+1.6 °C	48 mm	-16 mm
Jun	26.5 °C	+1.6 °C	8 mm	-24 mm
Jul	25.3 °C	+1.3 °C	9 mm	-42 mm
Aug	24.6 °C	+0.2 °C	63 mm	+9 mm
Sep	27.2 °C	+1.3 °C	75 mm	+42 mm
Oct	26.4 °C	+0.5 °C	160 mm	+111 mm
Nov	25.2 °C	+1.3 °C	23 mm	-75 mm
Dec	25.6 °C	+1.6 °C	53 mm	-14 mm

The year's extremes

Hottest day

30.7 °C

14 Mar 2025

Coldest day

12.0 °C

7 Jan 2025

Wettest day

43.5 mm

29 Oct 2025

Windiest day

19.5 km/h

7 Oct 2025

Strongest gust

46.1 km/h

9 Jan 2025

Hottest feels-like

30.7 °C

14 Mar 2025

Coldest feels-like

10.1 °C

7 Jan 2025

Sunniest day

11.8 h

1 Apr 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Isiolo?

Isiolo has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 19.7 °C and it receives 672 mm of precipitation per year.

What is the hottest day ever recorded in Isiolo?

The hottest day measured in Isiolo between 1940 and 2025 was 9 April 2019, reaching 31.6 °C.

What is the coldest day in Isiolo?

The coldest day measured in Isiolo between 1940 and 2025 was 15 January 1968, at 8.9 °C.

Does it snow in Isiolo?

Almost never: Isiolo sees virtually no snow, with about 0 frost days per year.

Has the climate of Isiolo warmed?

Yes: Isiolo warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Isiolo?

The wettest day measured in Isiolo between 1940 and 2025 was 4 May 2024, with 106 mm of rain in 24 hours.

What was the windiest day in Isiolo?

The windiest day measured in Isiolo between 1940 and 2025 was 28 September 1963, with winds reaching 22.4 km/h.

What is the warmest month in Isiolo?

The warmest month in Isiolo is March (20.7 °C on average); the coldest is July (18.7 °C).

How much does it rain in Isiolo?

Isiolo receives on average 672 mm of precipitation per year, spread over about 134 rainy days.

Is it sunny in Isiolo?

Isiolo gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.

Are there tropical nights in Isiolo?

Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Isiolo.

What was the most extreme apparent temperature in Isiolo?

In Isiolo, between 1940 and 2025, the highest apparent temperature reached 32.4 °C on 18 March 1959, and the lowest was 5.3 °C on 2 January 2012.

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