diff --git a/src/ipa/rkisp1/algorithms/agc.cpp b/src/ipa/rkisp1/algorithms/agc.cpp
index 5a3ba0131cf1..101cad5d0893 100644
--- a/src/ipa/rkisp1/algorithms/agc.cpp
+++ b/src/ipa/rkisp1/algorithms/agc.cpp
@@ -439,15 +439,20 @@ void Agc::fillMetadata(IPAContext &context, IPAFrameContext &frameContext,
  */
 double Agc::estimateLuminance(double gain) const
 {
+	ASSERT(expMeans_.size() == weights_.size());
 	double ySum = 0.0;
+	double wSum = 0.0;
 
 	/* Sum the averages, saturated to 255. */
-	for (uint8_t expMean : expMeans_)
-		ySum += std::min(expMean * gain, 255.0);
+	for (unsigned i = 0; i < expMeans_.size(); i++) {
+		double w = weights_[i];
+		ySum += std::min(expMeans_[i] * gain, 255.0) * w;
+		wSum += w;
+	}
 
 	/* \todo Weight with the AWB gains */
 
-	return ySum / expMeans_.size() / 255;
+	return ySum / wSum / 255;
 }
 
 /**
@@ -515,6 +520,8 @@ void Agc::process(IPAContext &context, [[maybe_unused]] const uint32_t frame,
 	Histogram hist({ params->hist.hist_bins, context.hw->numHistogramBins },
 		       [](uint32_t x) { return x >> 4; });
 	expMeans_ = { params->ae.exp_mean, context.hw->numAeCells };
+	std::vector<uint8_t> &modeWeights = meteringModes_.at(frameContext.agc.meteringMode);
+	weights_ = { modeWeights.data(), modeWeights.size() };
 
 	/*
 	 * Set the AGC limits using the fixed exposure time and/or gain in
diff --git a/src/ipa/rkisp1/algorithms/agc.h b/src/ipa/rkisp1/algorithms/agc.h
index 62bcde999fe3..7867eed9c4e3 100644
--- a/src/ipa/rkisp1/algorithms/agc.h
+++ b/src/ipa/rkisp1/algorithms/agc.h
@@ -55,6 +55,7 @@ private:
 				  utils::Duration frameDuration);
 
 	Span<const uint8_t> expMeans_;
+	Span<const uint8_t> weights_;
 
 	std::map<int32_t, std::vector<uint8_t>> meteringModes_;
 };