Free tools · Measured from space

Heat in Ward 33, Ray Nkonyeni

Summer 2025/26: the ground in Ward 33, Ray Nkonyeni reached about 37 °C on clear mornings. That is the ground (roofs, roads, soil), not the air. The third hottest summer since 2014. In summer the ground here reads +1.6 °C against its municipality’s average (since 2014).

Land surface temperature is how hot the ground itself is: roofs, roads, bare soil and leaves, as a satellite sees them from above. Landsat passes at about 10 in the morning and sees only through clear skies. It is not the air temperature a weather station gives: on a sunny day the ground is often 10 to 20 degrees hotter than the air, and hard, dark, dry surfaces heat up most while trees, grass and water stay cooler.

What it is not: not the afternoon peak, not the night, not the air you feel in the shade, and not a reading at any one house. A month with clouds rests on few clear looks.

Summer 2025/26

36.5 °CThe ground, not the airDecember to February, clear mornings
2019/20Hottest summer since 201437.3 °C; the coolest was 2016/17, 33.0 °C
+1.6 °CAgainst its municipalityThe ward’s summers against the municipality’s average, 5 summers since 2014

Every summer since 1987

Each summer (December to February, named by the year it ends) on clear mornings. Bars start at 28 °C, not zero. Darker: Landsat 8 and 9 (from 2014); lighter: Landsat 5 and 7. A gap is a summer seen too little.

Show the numbers

Land surface temperature each summer, 1987 to 2026: every figure
When or what	Figure
Summer 1986 to 87	34.9 °C
Summer 1990 to 91	30.3 °C
Summer 1996 to 97	31.6 °C
Summer 1997 to 98	35.9 °C
Summer 1998 to 99	33.5 °C
Summer 1999 to 00	32.9 °C
Summer 2000 to 01	33.5 °C
Summer 2001 to 02	31.2 °C
Summer 2002 to 03	36.5 °C
Summer 2006 to 07	33.4 °C
Summer 2012 to 13	36.3 °C
Summer 2016 to 17	33.0 °C
Summer 2019 to 20	37.3 °C
Summer 2020 to 21	34.3 °C
Summer 2021 to 22	36.2 °C
Summer 2022 to 23	37.2 °C
Summer 2025 to 26	36.5 °C

The shape of a year

Each month’s average since 2014, clear mornings. Bars start at 16 °C.

Show the numbers

Land surface temperature by calendar month, since 2014: every figure
When or what	Figure
January	35.7 °C
February	34.9 °C
March	32.8 °C
April	26.4 °C
May	22.9 °C
June	18.7 °C
July	19.7 °C
August	23.2 °C
September	28.3 °C
October	33.6 °C
November	36.5 °C
December	35.7 °C

Month by month

Month	Land surface temperature	Clear looks
October 2026	28.4 °C	1.0
September 2026	24.1 °C	1.4
August 2026	23.9 °C	1.2
July 2026	20.2 °C	1.7
June 2026	21.0 °C	1.5
May 2026	25.6 °C	2.0
April 2026	31.0 °C	3.0
March 2026	Seen too little	0.1
February 2026	36.0 °C	3.3
January 2026	36.9 °C	2.6
December 2025	Seen too little	0.0
November 2025	Seen too little	0.0
October 2025	35.4 °C	1.7
September 2025	30.3 °C	1.0
August 2025	22.4 °C	1.7
July 2025	19.2 °C	2.0
June 2025	18.5 °C	2.9
May 2025	22.1 °C	2.9
April 2025	25.1 °C	0.8
March 2025	30.4 °C	3.0
February 2025	Seen too little	0.0
January 2025	Seen too little	0.0
December 2024	33.7 °C	1.0
November 2024	Seen too little	0.0

“Clear looks” is how many times the average 240 m patch of the place was seen through clear sky that month. Under one, part of the place was not seen at all, so the figure leans on the part that was.

Ray Nkonyeni and its wards · Every municipality, ranked

Source

Measured from space by the American Landsat satellites: the ground, not the air.

How we worked this out

Landsat 5 to 2011, Landsat 7 to bridge the gaps, Landsat 8 and 9 from 2013: different satellites pass at slightly different times, so compare summers within the same years first.

What we changed: we kept only the clear land cells (no cloud, cloud shadow, snow or water, with a margin round each cloud), read them at 480 m, and averaged them over each 2026 ward each month; larger places are the sums of their wards.

Landsat imagery courtesy of the U.S. Geological Survey (Landsat Collection 2 surface temperature, through Digital Earth Africa’s copy).

Dataset: land surface temperature by ward, release of 13 November 2026.