Longest Wet Spell in Birmingham: What the Nearest Official Station Records

Updated: 2026-09-19

Birmingham does not run its own long-record weather station, so the best reference available is the closest official measuring point. That is Halesowen, in West Midlands, sitting at 153 m of altitude and roughly 13.3 km from Birmingham. Everything on this page describes what that station logged — not a direct measurement of Birmingham itself. Local differences in altitude, shelter and the urban surface mean the city's own rainfall timing can shift slightly from what Halesowen caught.

Across the recorded period, the longest wet spell at Halesowen lasted 15 consecutive days. It ran from 21 September 1974 to 5 October 1974, and over that run the station collected 71.6 mm of rain. No other spell in the series reached 15 days.

The five longest wet spells at the nearest station

These are the five longest runs of consecutive wet days recorded at Halesowen across 1946–2004. Note how two of them are late-autumn events and one bridges the turn of a year.

What makes the 1951 entry interesting is its rainfall total: the spell lasted 14 days and the station logged 148.2 mm over it. Meanwhile the longest spell of all, in 1974, only fetched 71.6 mm — proof that duration and intensity are two different stories. A long wet spell doesn't require heavy rain; it requires steady, persistent rain day after day.

Which months produce the longest wet spells?

The table below shows, for each month, the longest wet spell ever recorded at Halesowen during that calendar month. September stands out with 15 days, and the surrounding autumn months are close behind.

The pattern is clear: the year's driest spell-runner month is April at 8 days, and August matches it at 8 days too. Then in September the number jumps to 15 — more than any other month. October follows with 14 days, and December with 12. That gives September and October a combined weight as the peak months for extended wet runs at this station.

If you're planning an outdoor event near Birmingham, September and October are worth treating cautiously given this record — the archive shows long, unbroken wet sequences are most common there.

How the records were collected

The Halesowen series covers 1946-01-02 to 2004-11-01, with 21,398 days carrying readings. That daily record is what allows a question like "what was the longest wet spell?" to be answered precisely rather than roughly — it takes a systematic daily archive to spot that a run lasted 15 days rather than 8 or 10. The Met Office MIDAS archive is the source, and the data here reflect what that station measured, no interpolations for Birmingham itself.

It is worth remembering how narrow the geography is here: Halesowen sits at 153 m, about 13.3 km from Birmingham. Small elevation differences across the West Midlands can slightly change the timing or the totals of any individual wet spell, so treat these figures as the closest official benchmark, not as the final word on the city centre.

Source: Met Office MIDAS archive, station Halesowen, period 1946–2004. Open Government Licence (OGL v3.0), held at CEDA.

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© 2026 HistoClima · data: Met Office (OGL v3.0) · not affiliated with Met Office · citation permitted with source.