Rain in 7 minutes. Stopping in 23.

Know before it rains.

4.9/5 on the App Store

More accurate than Apple Weather and the NWS

Rain accuracy, head to head

Accuracy score

Hours ahead	GrayCloud	Apple	NWS
Now	85.0	82.1	85.9
1 hour	90.3	84.5	85.8
3 hours	90.0	84.7	85.5
6 hours	89.7	84.0	85.1
12 hours	89.4	83.8	84.2
24 hours	88.5	83.2	83.4
Overall	88.8	83.7	84.5

Higher is better. A score of 100 means the stated chance of rain matched reality perfectly.

Brier score

Hours ahead	GrayCloud	Apple	NWS
Now	0.0374	0.0447	0.0352
1 hour	0.0243	0.0388	0.0355
3 hours	0.0249	0.0382	0.0362
6 hours	0.0257	0.0399	0.0372
12 hours	0.0266	0.0405	0.0396
24 hours	0.0288	0.0419	0.0414
Overall	0.0280	0.0406	0.0389

Lower is better. A Brier score of 0 is a perfect forecast; it is the standard measure of probability accuracy.

How closely each service’s rain chances matched reality, across 300,000+ hourly forecast checks per service in 21 U.S. cities, June 2 to July 1, 2026.