Dallas records about 914mm of rain across roughly 79 wet days a year, which is a 22% chance on an average day. May is the wettest month at 119mm (13% of the annual total) and January the driest at 51mm. Local rain type: thunderstorms. Dallas sits in Tornado Alley — severe spring thunderstorms demand weather awareness. Always check forecasts from March through June.
Chance of rain on an average day: 22%
Rainfall climatology for Dallas. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 914mm |
| Rain days per year | 79 |
| Odds on an average day | 22% |
| Wettest month | May — 119mm over 10 days |
| Driest month | January — 51mm over 4 days |
| Rain type | thunderstorms |
| Best dry window | November offers dry, comfortable conditions before winter cold arrives. |
| Worst rain window | April through June brings severe storm season with tornadoes, hail, and dramatic lightning. |
May delivers 133% more rain than January (119mm vs 51mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 13% of the annual total, so rain in Dallas is spread through the year — there is no season you can rely on being dry.
Dallas rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 10 days in May against 4 in January — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 51mm | 4 | 13% | 13°C |
| February | 62mm | 5 | 17% | 13°C |
| March | 78mm | 7 | 23% | 16°C |
| April | 83mm | 7 | 23% | 22°C |
| May | 119mm | 10 | 33% | 27°C |
| June | 101mm | 9 | 30% | 33°C |
| July | 56mm | 5 | 17% | 36°C |
| August | 56mm | 5 | 17% | 36°C |
| September | 76mm | 7 | 23% | 33°C |
| October | 102mm | 9 | 30% | 27°C |
| November | 67mm | 6 | 20% | 22°C |
| December | 62mm | 5 | 17% | 16°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Dallas we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Dallas records rain on roughly 79 days a year — about a 22% chance on any given day — totalling around 914mm.
May, with about 119mm over 10 rain days. That is 13% of the entire year's rainfall in a single month.
January is the driest month at 51mm across roughly 4 days. November offers dry, comfortable conditions before winter cold arrives.
Dallas sits in Tornado Alley — severe spring thunderstorms demand weather awareness. Always check forecasts from March through June.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.