Climate in Pasadena
Pasadena shares Houston's humid subtropical climate -- hot, humid summers and mild winters -- with hurricane-season rainfall as the dominant seasonal risk. Unlike a Gulf-fronting city, Pasadena's flood exposure runs primarily through inland bayous and creeks rather than direct storm surge, and Hurricane Harvey is the defining recent case study.
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Learn moreA hot, humid, no-snow climate typical of the Houston metro
Houston-area summers run genuinely brutal: August averages around 95°F, average humidity sits near 72% year-round and closer to 80% in summer, and with humidity that high, heat index values regularly exceed 110°F (climatestotravel.com/usclimatedata aggregation, retrieved 2026-08-22). Annual rainfall runs about 51.8 inches, with no true dry season -- May-June and August-October (overlapping hurricane season) are the rainiest stretches.
Hurricane season and the specific lesson of Harvey
Atlantic hurricane season runs June 1-November 30, with the highest probability August-October. Hurricane Harvey in 2017 dropped over 60 inches of rain in parts of the Houston area over four days, and neighborhoods in the Pasadena area were hit hard by flooding from creeks, bayous, and the San Jacinto River rather than direct coastal storm surge -- Pasadena sits inland of the immediate Galveston Bay shoreline, so its hurricane risk is dominated by extreme rainfall and bayou overflow, not the surge exposure a directly bay-fronting city like Baytown carries (Axios/ProPublica Harvey coverage, retrieved 2026-08-22).
Being outside the mapped 100-year floodplain didn't mean safety during Harvey
This is a specific, important local fact: 68% of all structures that flooded in Harris County during Harvey were outside the mapped 100-year floodplain at the time -- meaning FEMA flood-zone status alone was a poor predictor of actual Harvey flood risk (Houston Chronicle, retrieved 2026-08-22). That finding drove a multi-jurisdiction push to update Harris County's flood maps; new proposed FEMA maps released in 2026 would more than double the number of Harris County properties falling at least partially within a 100-year floodplain, and roughly 20 Pasadena ISD schools were identified as facing greater flood-risk designations under the proposed maps (Kinder Institute/Houston Chronicle/Houston Public Media coverage, retrieved 2026-08-22).
Key takeaways
- Pasadena shares Houston's hot, humid subtropical climate: August averages near 95°F, summer humidity around 80%, and heat index values regularly topping 110°F.
- Annual rainfall runs about 51.8 inches with no true dry season; the rainiest periods overlap hurricane season (June-November, peak August-October).
- Pasadena's hurricane-related flood risk runs primarily through inland bayous, creeks, and the San Jacinto River rather than direct Gulf storm surge -- a real distinction from Galveston Bay-fronting Baytown.
- 68% of Harris County structures that flooded during Harvey sat outside the mapped 100-year floodplain -- FEMA flood-zone status alone is not a reliable predictor of actual risk here, and 2026 proposed FEMA map updates would significantly expand Harris County's mapped floodplain, with roughly 20 Pasadena ISD schools flagged for higher flood-risk designations.
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