Newark Weather

May is Newark's best month by a clear margin. May 2025 logged a comfort score of 90 out of 100, with average highs of 70°F, average lows of 54°F, and 13.3 hours of sunshine per day. Rainfall was zero that month, which is about as clean a weather record as the Bay Area produces. July and August are close behind, with comfort scores of 89 across both years in the data and average highs in the mid-70s. September is also reliably good: September 2024 hit 89 comfort with highs around 76°F and only a trace of rain. The pattern at Newark is that the whole stretch from late April through September is excellent, with May and early summer being the most consistently sunny and comfortable. The city's position near the southern bay means it gets genuine warmth without the punishing inland heat of cities like Livermore or Brentwood. If you're picking a window, late spring is the sweet spot: warmth is building, rain is done, and the long evenings are pleasant.

Newark runs warm but not hot. Summer highs typically land in the low-to-mid 70s, with June averaging around 70-76°F and August reaching the mid-70s. The city's low elevation at just 13 feet and its proximity to San Francisco Bay means that incoming marine air moderates temperatures before they can climb into the 90s that inland cities regularly see. On the hottest inland heat wave days, Newark might push into the low 80s, but the bay keeps a lid on it most of the time. Mornings are mild even in peak summer, with lows in the upper 50s to low 60s. The comfort scores reflect this: July and August consistently land at 88-89 out of 100, which means the heat is genuinely pleasant rather than oppressive. The bigger variable in summer is afternoon wind off the bay, which can make it feel cooler than the thermometer suggests. That wind is usually welcome rather than disruptive, but it's worth knowing about if you're planning to sit outside for a long stretch.

Newark's winters are mild by most standards, though noticeably cooler and wetter than the rest of the year. Average lows run from the low to mid-40s in December through February, with the coldest recorded low in the dataset around 40°F. Frost is rare and snow essentially doesn't happen at this elevation and latitude. Daytime highs in winter cluster between 57°F and 61°F, which is cool enough to want a jacket but comfortable for walking around on a dry day. The bigger issue is rain. January 2025 brought nearly 5 inches of precipitation and a comfort score of 75, and November through February is when consecutive rainy days become a real possibility. Winter comfort scores drop into the 69-78 range, with December 2025 hitting a low of 69 due to reduced sunshine and rain. That is still livable compared to genuinely harsh winters elsewhere, and clear winter days in Newark, with views across the refuge and flat bay light, can be quite beautiful. The wet season runs from November through March, and within that window January and November are the most reliably rainy months.

Newark follows the Bay Area's Mediterranean rain pattern almost exactly: a long dry season from June through September, then a wet season that builds through fall and peaks in winter. In the 18-month dataset, the wettest months were January 2025 (4.99 inches), November 2024 (4.44 inches), February 2025 (4.68 inches), and October 2025 (4.37 inches). The summer dry season is remarkably reliable: from June through September across both years, total rainfall was near zero in most months. The city logs roughly 77 rainy days per year, which leaves about 275 days comfortable enough to count as perfect. If you're planning a visit around dry weather, the window from late May through late September is about as dependable as Bay Area weather gets. The Bay Area's rainiest months follow a consistent pattern, and Newark's data reflects it well: October can surprise you with early rain, but June through September almost never will.

Newark gets some morning fog, but not a lot of it. The 18-month average is about 1.8 hours of morning fog per day, which is moderate for a bay-adjacent city at low elevation. The foggiest months in the data are June 2025 (2.6 hours), November 2024 and January 2025 (both around 2.1 hours). Even at peak, that is modest compared to coastal cities or hilltop locations in the East Bay. Newark's position along the southern bay means the marine layer coming through the Golden Gate has already dissipated or thinned significantly by the time it reaches here. Most mornings that start foggy clear by mid-morning, and summer afternoons are typically bright and sunny. The fog at Newark is more of a texture than a defining feature. It rarely hangs all day the way it does in San Francisco or Daly City. Why morning fog forms in the Bay Area explains the mechanics, but the short version is that Newark simply doesn't sit in the main fog corridor that runs inland from the Pacific.

Yes, noticeably. Newark's average high of 67°F across 18 months sits well above San Francisco's summer averages, which typically hover in the low 60s on the city's foggier west side. The difference is most pronounced from June through September. While San Francisco's July can mean a 62°F high under a marine layer, Newark's July averages 74°F with clear skies and 12 or more hours of sunshine per day. The reason is geography: San Francisco sits at the bay's entrance, fully exposed to cold Pacific air funneling through the Golden Gate. Newark sits at the southern end of the bay, far enough inland that the same onshore flow has warmed and dried considerably by the time it arrives. The Bay Area's microclimate system creates exactly this kind of variation within a short distance. In winter the gap narrows, since both cities are cool and wet, but Newark still tends to run slightly warmer on average even then.

From May through October, Newark is quite comfortable for evening outdoor dining. Summer evenings typically settle in the low-to-mid 60s after sunset, warm enough for a patio with a light jacket or fleece. The bay-facing location means there can be an afternoon breeze that carries into the early evening, but it usually calms rather than intensifies after dark. Spring and early fall are the most pleasant windows: April and May cool into the upper 50s by 8 p.m., while September evenings can hold in the 60s well after sunset. The low elevation means Newark doesn't get the aggressive nighttime temperature drops that higher-elevation East Bay cities experience. Winter evenings are a different calculation. From November through February, temperatures drop into the mid-to-upper 40s after dark, and rain is genuinely possible on any given evening. Outdoor dining in winter is doable on clear, dry nights but not reliable. For summer and fall, Newark's evenings are dependably comfortable, and the combination of warmth and calm air makes patio dining a reasonable default rather than a gamble.

Newark and Fremont are neighbors, but they have slightly different weather personalities. Fremont's average comfort score runs around 85 out of 100 over the same period, while Newark averages 84, putting them close. The differences show up in the details. Fremont sits at higher elevation and a bit farther from the bay shoreline, which tends to push its summer highs a few degrees warmer and reduce its bay wind exposure. Newark, at just 13 feet of elevation and right along the bay's edge, captures more of the afternoon marine wind and runs a touch cooler in summer. Both cities benefit from the same inland warming dynamic that separates South Bay weather from coastal fog zones. In practice, both are good options. If you want slightly warmer and calmer afternoons, Fremont has a small edge. If you want proximity to the bay, the Don Edwards Wildlife Refuge, and that flat coastal light, Newark's position near the water is a genuine draw.

Newark is one of the more straightforward Bay Area destinations to dress for, but the bay location and afternoon wind add one wrinkle. In summer, light clothes work for the middle of the day, but a wind-resistant layer is worth having because bay breezes can make a 72°F afternoon feel meaningfully cooler. A light jacket or zip fleece in your bag covers most situations from May through October. Mornings and evenings require a medium layer even in peak summer, when lows sit in the upper 50s. Spring and fall mean a wider daily swing: April mornings can start in the low 50s and reach nearly 70°F by afternoon. Layering with something easy to remove is the practical approach. For winter visits, a proper jacket and rain gear are standard from November through February. Newark rarely gets cold enough for heavy insulation, but staying dry matters more than staying warm during wet season. Dressing in layers for Bay Area weather applies here, and the bay wind piece means the coastal layering logic is more relevant to Newark than to inland cities like Danville or Pleasanton.

Newark gets a solid amount of sunshine: the 18-month average is about 9.8 hours per day, which is meaningfully more than coastal Bay Area cities. The sunniest months are May through July, with May 2025 topping the dataset at 13.3 hours per day and both June months logging 12.5 or more hours. Even in the darker winter months, Newark holds up reasonably well: December 2024 averaged 8 hours of sunshine despite being a rainy month, and February climbs back to 9.4 hours as the days lengthen. The lowest readings in the data are November and December, when sunshine drops to around 6.5 hours. The sunny reputation in the destination tags reflects this accurately. Nearby Coyote Hills Regional Park sits at essentially the same elevation and captures similar sunshine totals, making the whole southern bay shoreline a reliably bright zone compared to the foggy coastal cities to the west and north. For people who need their sun exposure and find San Francisco's summer fog oppressive, Newark's 275 perfect days per year makes a compelling case.