UAH v6.1 Global Temperature Update for September, 2025: +0.53 deg. C

October 2nd, 2025 by Roy W. Spencer, Ph. D.

The Version 6.1 global average lower tropospheric temperature (LT) anomaly for September, 2025 was +0.53 deg. C departure from the 1991-2020 mean, up from the August, 2025 anomaly of +0.39 deg. C.

The Version 6.1 global area-averaged linear temperature trend (January 1979 through September 2025) remains at +0.16 deg/ C/decade (+0.22 C/decade over land, +0.13 C/decade over oceans).

The following table lists various regional Version 6.1 LT departures from the 30-year (1991-2020) average for the last 21 months (record highs are in red).

YEARMOGLOBENHEM.SHEM.TROPICUSA48ARCTICAUST
2024Jan+0.80+1.02+0.58+1.20-0.19+0.40+1.12
2024Feb+0.88+0.95+0.81+1.17+1.31+0.86+1.16
2024Mar+0.88+0.96+0.80+1.26+0.22+1.05+1.34
2024Apr+0.94+1.12+0.76+1.15+0.86+0.88+0.54
2024May+0.78+0.77+0.78+1.20+0.05+0.20+0.53
2024June+0.69+0.78+0.60+0.85+1.37+0.64+0.91
2024July+0.74+0.86+0.61+0.97+0.44+0.56-0.07
2024Aug+0.76+0.82+0.69+0.74+0.40+0.88+1.75
2024Sep+0.81+1.04+0.58+0.82+1.31+1.48+0.98
2024Oct+0.75+0.89+0.60+0.63+1.90+0.81+1.09
2024Nov+0.64+0.87+0.41+0.53+1.12+0.79+1.00
2024Dec+0.62+0.76+0.48+0.52+1.42+1.12+1.54
2025Jan+0.45+0.70+0.21+0.24-1.06+0.74+0.48
2025Feb+0.50+0.55+0.45+0.26+1.04+2.10+0.87
2025Mar+0.57+0.74+0.41+0.40+1.24+1.23+1.20
2025Apr+0.61+0.77+0.46+0.37+0.82+0.85+1.21
2025May+0.50+0.45+0.55+0.30+0.15+0.75+0.99
2025June+0.48+0.48+0.47+0.30+0.81+0.05+0.39
2025July+0.36+0.49+0.23+0.45+0.32+0.40+0.53
2025Aug+0.39+0.39+0.39+0.16-0.06+0.69+0.11
2025Sep+0.53+0.56+0.49+0.35+0.38+0.77+0.32

The full UAH Global Temperature Report, along with the LT global gridpoint anomaly image for September, 2025, and a more detailed analysis by John Christy, should be available within the next several days here.

The monthly anomalies for various regions for the four deep layers we monitor from satellites will be available in the next several days at the following locations:

Lower Troposphere

Mid-Troposphere

Tropopause

Lower Stratosphere


5 Responses to “UAH v6.1 Global Temperature Update for September, 2025: +0.53 deg. C”

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  1. Fritz Kraut says:

    Warming goes on,
    and Denying and Ignoring will goe on.

    Same procedure as every month.

  2. studentb says:

    Richard M (last month):
    “The change to the AMO cool phase is due soon.”

    Oops. The latest value is the warmest in 5 months.

  3. Bellman says:

    Third warmest September, though still a lot cooler than the previous two years.

    Year Anomaly
    1 2024 0.81
    2 2023 0.80
    3 2025 0.53
    4 2019 0.44
    5 2020 0.40
    6 2017 0.39
    7 2016 0.30
    8 1998 0.28
    9 2021 0.26
    10= 2010 0.20
    11= 2022 0.20

    My projection for 2025 is now 0.475 +/- 0.068C, with a 90% chance that 2025 will be the 2nd warmest year on record.

  4. Nate says:

    As Roy noted the trend since the start is 0.16 deg/decade.

    But the trend over the last 20 y is nearly double that, at 0.31 deg/decade.

    The warming has accelerated.

  5. RLH says:

    Called it 10 days ago (or so).

    See https://oz4caster.wordpress.com/cfsr/.

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