Custom Merch for Gyms in Riverside, CA
Merch Mob makes member tees, coach and staff apparel, and challenge and competition shirts for gyms in Riverside, CA, at its shop in Montclair, CA, and ships them to Riverside. Young adults make up 29% of Riverside, against 23% nationally (Census ACS, 2020-2024); that age group wears gym apparel outside the gym too, so the design should hold up as everyday wear.
Riverside by the numbers
Riverside has 323,057 residents, up 2.4% since 2020 (Census estimates).
Riverside County has 262 fitness and recreational sports centers with paid employees (Census County Business Patterns, 2023). That is 1.0 for every 10,000 residents, below the national figure of 1.2. 50% of them employ fewer than 10 people. The count is up 36% from 192 in 2018.
That Census category covers gyms and studios along with other recreational sports facilities.
Riverside County as a whole has 2,544,916 residents, up 5.2% since 2020. Riverside County has one fitness or recreational sports center for every 9,710 residents.
- Population, 2025
- 323,057
- Since 2020
- +2.4%
- County
- Riverside County
- Fitness and recreational sports centers in Riverside County, 2023
- 262
- Per 10,000 county residents
- 1.0 (US 1.2)
- Time zone
- Pacific
- Median age
- 33.6 (US 38.9)
- Residents aged 18 to 34
- 29% (US 23%)
- Warmest month, average high
- August, 95°F
- Coldest month, average low
- December, 43°F
- Days at 90°F or hotter, a year
- 101
- Nights at 32°F or colder, a year
- 4
- Rain, a year
- 9.4 in
- USPS zone from the shop
- 2
Weather: Riverside Municipal Airport station, 3 mi from Riverside's center (NOAA 1991-2020 Climate Normals). People: Census ACS 2020-2024. Counts: CBP 2023, by county, paid-employee establishments. Population: Census, July 2025.
What Riverside's weather means for gyms
Riverside averages a high of 95°F in August and reaches 90°F on about 101 days a year, so the shirts members train in are tanks, muscle tees and light performance tees. No month averages a high under 65°F, though December mornings bring average lows of 43°F, so a light hoodie earns a small spot for members at early classes. Light tees and tanks sell for 9 months of the year, the months that average a high of 70°F or more, so they deserve most of the reorder. About 22 days a year reach 100°F, which pushes outdoor sessions to dawn and dusk and makes a quick-drying fabric matter more than a heavy print. Rain totals about 9.4 inches a year, so a wet day seldom cancels an outdoor class, and a run club or bootcamp tee can be timed around heat and cold rather than storms.
| Month in Riverside | Average high | Average low | Rain (in) | What members train in |
|---|---|---|---|---|
| January | 68°F | 44°F | 2.3 | Tees and light quarter-zips |
| February | 68°F | 45°F | 2.4 | Tees and light quarter-zips |
| March | 72°F | 47°F | 1.2 | Member tees and tanks |
| April | 76°F | 50°F | 0.6 | Member tees and tanks |
| May | 80°F | 55°F | 0.2 | Member tees and tanks |
| June | 87°F | 59°F | 0 | Tanks and performance tees |
| July | 93°F | 64°F | 0.1 | Tanks and performance tees |
| August | 95°F | 65°F | 0 | Tanks and performance tees |
| September | 91°F | 62°F | 0.1 | Tanks and performance tees |
| October | 83°F | 55°F | 0.3 | Member tees and tanks |
| November | 75°F | 47°F | 0.6 | Member tees and tanks |
| December | 67°F | 43°F | 1.5 | Tees and light quarter-zips |
Made in So Cal, shipped to Riverside.
Riverside shares the shop's Southern California region; orders ship from there.
Riverside is about 19 miles from Merch Mob's shop in Montclair, CA, a straight-line distance. From the shop's ZIP code, Riverside is USPS zone 2. Riverside shares the shop's Pacific time zone.
From the production floor
Merch Mob production in Southern California.
Ordering from Riverside
When should a gym in Riverside stock hoodies?
Only lightly. Average highs in Riverside stay at 65°F or above all year, so one small run of light hoodies, timed for the holidays and the coolest weeks, covers it.
More for Riverside
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