Boulder County weather forecasts, climate data, and outdoor planning by city. Covers Louisville, Lafayette, Superior, Erie, Longmont, Lyons, Nederland, and more.

Louisville, CO weather forecasts, fire risk, and outdoor planning. Plains-foothills city in Boulder County hit by the 2021 Marshall Fire. Elevation 5,337 ft.

Lafayette, CO weather forecasts, climate data, and outdoor planning. Boulder County coal-mining town east of Louisville on Coal Creek. Elevation 5,237 ft.

Superior, CO weather forecasts, fire risk, and outdoor planning. Boulder County town at the base of Marshall Mesa, hit hardest by the 2021 Marshall Fire.

Erie, CO weather forecasts and outdoor planning. Boulder/Weld County plains town east of Lafayette; warmer summers, less snow than the Boulder foothills.