Monthly climate report
Climate report: August 2025
Global land temperature (NASA GISTEMP v4) and atmospheric CO₂: where things stand at the end of August 2025.
Global temperature in August 2025
- August 2025 (land)
- +1.78 °Cversus 1901–1930
- Rank of the month
- 4thof 146 Augusts on record
- 2025, January–August
- +2.00 °C2nd of 146 years
- 12-month average
- +2.04 °C12 months ending August 2025
In August 2025, land areas worldwide were +1.78 °C warmer than the 1901–1930 average, according to NASA's GISTEMP v4 analysis, compared with +2.25 °C in August 2024. That makes it the 4th warmest August in 146 years of records. The record for this month remains August 2024 (+2.25 °C).
From January to August, 2025 averages +2.00 °C — the 2nd warmest start to a year since 1880.
Over the 12 months ending in August 2025, the land average is +2.04 °C, against +2.21 °C over the previous 12 months. The highest 12-month average remains the one ending in August 2024 (+2.21 °C).
These figures cover land areas only. Land warms faster than the ocean, so the values are higher than the combined land-and-ocean averages usually quoted.
The last 13 months
| Month | Anomaly vs 1901–1930 |
|---|---|
| August 2025 | +1.78 °C |
| July 2025 | +1.44 °C |
| June 2025 | +1.69 °C |
| May 2025 | +1.70 °C |
| April 2025 | +2.23 °C |
| March 2025 | +2.53 °C |
| February 2025 | +2.07 °C |
| January 2025 | +2.56 °C |
| December 2024 | +2.38 °C |
| November 2024 | +2.01 °C |
| October 2024 | +2.16 °C |
| September 2024 | +1.95 °C |
| August 2024 | +2.25 °C |
The 10 warmest Augusts on record
Land areas, 1880–2025.
| # | Year | Anomaly vs 1901–1930 |
|---|---|---|
| 1 | August 2024 | +2.25 °C |
| 2 | August 2023 | +1.87 °C |
| 3 | August 2016 | +1.80 °C |
| 4 | August 2025this report | +1.78 °C |
| 5 | August 2022 | +1.61 °C |
| 6 | August 2011 | +1.50 °C |
| 7 | August 2021 | +1.47 °C |
| 8 | August 2019 | +1.45 °C |
| 9 | August 2017 | +1.44 °C |
| 10 | August 2020 | +1.41 °C |
Atmospheric CO₂
The annual mean rose from 421.08 ppm in 2023 to 424.60 ppm in 2024, +3.5 ppm in one year.
Sources and method
- Temperatures: NASA GISS, GISTEMP v4, monthly mean over land areas, rebased to 1901–1930 (file of November 14, 2026).
- Ranks use the months known at the date of the report. NASA slightly revises past values at each update, so figures can move by a few hundredths of a degree.
- CO₂: NOAA Global Monitoring Laboratory, Mauna Loa Observatory.