These are the best Tamron lenses with weather-sealing when you want reliable performance in rain, mist, dust, beach spray, and winter slush—events, travel, landscapes, wildlife, and run-and-gun video—and here’s what to look for as you buy: prioritize Tamron’s “Moisture-Resistant Construction” (gaskets at the mount, rings, and switches) plus a fluorine-coated front element for easy wipe-downs; favor internal focus (better sealing feel and gimbal balance), VC on stabilized models (pairs with IBIS/Active for steadier handhelds), linear VXD/RXD motors for quiet AF in bad weather, short minimum focus distance for larger subject separation in gloomy light, and shared filter threads (often 67 mm) so one slim VND and clear protector cover the kit; sealing helps, but bring a simple rain cover for downpours. Full-frame mirrorless sealed zoom heroes: 28–75mm ƒ2.8 Di III VXD G2 (weather-sealed, prime-like close-focus—bread-and-butter for wet city nights), 35–150mm ƒ2–2.8 VXD (workhorse range with robust sealing—events and travel compressed looks), 17–28mm ƒ2.8 RXD (featherweight UWA with gasketed mount—great flare control in spray), 20–40mm ƒ2.8 VXD (compact, sealed walk-and-talk lens), 17–50mm ƒ4 VXD (constant ƒ4 hybrid with sealing and tidy handling), 70–180mm ƒ2.8 VXD and 70–180mm ƒ2.8 Di III VC VXD G2 (both sealed; G2 adds VC and closer MFD—clutch in drizzle), 50–400mm ƒ4.5–6.3 VC VXD (sealed travel-tele with 0.5× close-focus—great in sea spray), 150–500mm ƒ5–6.7 VC VXD (sealed, stabilized wildlife/motorsports reach), and 70–300mm ƒ4.5–6.3 RXD (tiny, sealed budget tele—leans on IBIS when present). Full-frame mirrorless compact sealed primes: 20mm ƒ2.8, 24mm ƒ2.8, and 35mm ƒ2.8 Di III OSD M1:2 (all moisture-resistant with fluorine fronts—half-macro for rainy café/detail work). Adaptable DSLR-era sealed legends (great on EF-E/FTZ-E style adapters): SP 24–70mm ƒ2.8 G2 VC, SP 70–200mm ƒ2.8 G2 VC, and SP 150–600mm ƒ5–6.3 G2 VC (all feature extensive sealing and fluorine—built for foul weather), plus primes SP 85mm ƒ1.8 VC, SP 45mm ƒ1.8 VC, SP 35mm ƒ1.8 VC, and the SP 90mm ƒ2.8 Macro VC (all moisture-resistant with stabilized handling where applicable). APS-C sealed standouts: 17–70mm ƒ2.8 Di III-A VC RXD (stabilized, sealed do-it-all for rain-or-shine travel), 11–20mm ƒ2.8 Di III-A RXD (bright UWA with sealing for wet interiors and night streets), and 18–300mm ƒ3.5–6.3 Di III-A VC VXD (one-lens travel with weather resistance). Practical buyer tips: build a two-zoom spine that stays sealed on both ends (28–75/2.8 G2 + 70–180/2.8 G2 VC for events or 17–28/2.8 + 150–500 VC for landscapes/wildlife) and add one sealed compact prime (35/2.8) for low-profile days; standardize to 67 mm with step-up rings so one VND/clear protector fits everything, keep a microfiber and rocket blower in an inside pocket, and check that your adapter (if used) is snug and gasketed; sealing ≠ submersion—wipe off salt spray promptly and crack the mount only in dry shelter. Bad-weather shooting tips: keep hoods on to shield the front element, point the lens slightly down between shots, use AF-C with subject/eye detect and a flexible zone, raise ISO rather than dragging shutter in wind, and favor ƒ2.8–ƒ4 for clean contrast through fog; for video, hold a 180° shutter with VND, enable breathing compensation, and combine VC with IBIS/Active for steadier walk-and-talks—whether you’re hiking through drizzle, covering a rainy ceremony, or tracking wildlife in sea spray, the best Tamron weather-sealed lenses combine practical gasketed designs, fluorine-coated fronts, confident AF, and smart stabilization—so your gear stays dependable and your images stay sharp when the forecast turns.